1. An internal combustion engine comprising:
three or more cylinders arranged in parallel;
a crankshaft driven for rotation by pistons that reciprocate in the cylinders;
a camshaft supported for rotation, interlocked with the crankshaft and extending across all the cylinders;
a valve chamber forming member forming a valve chamber to contain the camshaft;
a valve train disposed in the valve chamber to open and close intake valves and exhaust valves; and
decompression mechanisms, respectively for the cylinders, arranged in the valve chamber to open the intake valves or the exhaust valves during a compression stroke;
wherein the valve train includes the camshaft, and valve cams formed on the camshaft for the cylinders to open and close the intake valves and the exhaust valves through valve-operating members,
a specific one, corresponding to a specific one of the cylinders, among the valve cams is located at a position not coincident with respect to an axial direction parallel to the axis of the camshaft with a position where an abutment portion, in contact with the valve-operating member, of the intake valve or the exhaust valve is located, and the decompression mechanism for the specific cylinder is located at a position coincident with respect to the axial direction with the position of the abutment portion of the intake valve or the exhaust valve.
2. The internal combustion engine according to claim 1, wherein the specific cylinder is an intermediate one of the cylinders.
3. The internal combustion engine according to claim 1, wherein the specific valve cam is offset toward the cylinder adjacent to the specific cylinder relative to the abutment portion of the intake valve or the exhaust valve, and a part of the camshaft, extending between the specific valve cam or the decompression mechanism for the specific cylinder, and the valve cam or the decompression mechanism for the cylinder adjacent to the specific cylinder, lacks any bearing for supporting said part of the camshaft.
4. The internal combustion engine according to claim 1, wherein the specific cylinder is an intermediate one of the cylinders, a part of the camshaft, extending between the specific valve cam or the decompression mechanism for the specific cylinder, and the valve cam or the decompression mechanism for one of the two cylinders on the opposite sides of the specific cylinder, lacks a bearing for supporting said part of the camshaft, and another part of the camshaft, extending between the specific valve cam or the decompression mechanism for the specific cylinder, and the valve cam or the decompression mechanism for the other one of the two cylinders on the opposite sides of the specific cylinder, is supported for rotation in a camshaft bearing.
5. The internal combustion engine according to claim 1, wherein the valve cam or the decompression mechanism for the specific cylinder is disposed adjacently to the valve cam or the decompression mechanism for cylinder adjacent to the specific cylinder.
6. An internal combustion engine comprising:
cylinders;
a crankshaft driven for rotation by pistons that reciprocate in the cylinders;
a camshaft supported for rotation, and interlocked with the crankshaft;
a valve chamber forming member forming a valve chamber to contain the camshaft;
a valve train disposed in the valve chamber to open and close intake valves and exhaust valves;
decompression mechanisms, respectively for the cylinders, arranged in the valve chamber to open the intake valves or the exhaust valves during a compression stroke; and
a fuel pump attached to the valve chamber forming member forming the valve chamber;
wherein the camshaft is provided with a pump cam having a cam surface with which a pump-operating member for driving the fuel pump comes into contact to drive the fuel pump, and one of the decompression mechanisms is provided with a centrifugal weight supported on the camshaft for turning and disposed adjacent to the pump cam with respect to an axial direction parallel to the axis of the camshaft, the centrifugal weight is on a side of a cam lobe defined by the cam surface of the pump cam as viewed in the axial direction, and the centrifugal weight turns toward the axis of the camshaft so as to approach a tip part of the cam lobe of the pump cam as the rotational speed of the camshaft increases.
7. An internal combustion engine comprising:
cylinders;
a crankshaft driven for rotation by pistons that reciprocate in the cylinders;
a camshaft supported for rotation, and interlocked with the crankshaft;
a valve chamber forming member forming a valve chamber to contain the camshaft;
a valve train disposed in the valve chamber to open and close intake valves and exhaust valves;
decompression mechanisms, respectively for the cylinders, arranged in the valve chamber to open the intake valves or the exhaust valves during a compression stroke; and
a fuel pump attached to the valve chamber forming member forming the valve chamber;
wherein the camshaft is provided with a pump cam having a cam surface with which a pump-operating member for driving the fuel pump comes into contact to drive the fuel pump, and one of the decompression mechanisms is provided with a centrifugal weight supported on the camshaft for radial movement and positioned adjacent to the pump cam with respect to an axial direction parallel to the axis of the camshaft, and the centrifugal weight moves in a range corresponding to the cam surface of the pump cam as viewed in the axial direction.
8. The internal combustion engine according to claim 1, further including:
a fuel pump attached to the valve chamber forming member forming the valve chamber;
wherein the camshaft is provided with a pump cam having a cam surface with which a pump-operating member for driving the fuel pump comes into contact to drive the fuel pump, and one of the decompression mechanisms is provided with a centrifugal weight supported on the camshaft for turning and disposed adjacent to the pump cam with respect to an axial direction parallel to the axis of the camshaft, the centrifugal weight is on a side of a cam lobe defined by the cam surface of the pump cam as viewed in the axial direction, and the centrifugal weight turns toward the axis of the camshaft so as to approach a tip part of the cam lobe of the pump cam as the rotational speed of the camshaft increases.
9. The internal combustion engine according to claim 1, further including:
a fuel pump attached to the valve chamber forming member forming the valve chamber;
wherein the camshaft is provided with a pump cam having a cam surface with which a pump-operating member for driving the fuel pump comes into contact to drive the fuel pump, and one of the decompression mechanisms is provided with a centrifugal weight supported on the camshaft for turning and disposed adjacent to the pump cam with respect to an axial direction parallel to the axis of the camshaft, and the centrifugal weight moves in a range corresponding to the cam surface of the pump cam as viewed in the axial direction.
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 socket connector, comprising:
an insulative housing having a planar base defining an array of passageway, each passageway including a passage and a slot in communication to each other, the passage featured a circular edge at a bottom surface of the base;
a plurality of contact terminals each arranged in a corresponding passageway, and each contact terminal including a base portion retained in the slot, and a contact engaging portion extending beyond a top surface of the insulative housing, and a solder portion having a curvilinear tail extending out of a bottom of the passageway; and
a plurality of solder mass each disposed between the curvilinear tail and the circular edge.
2. The socket connector as recited in claim 1, wherein the curvilinear tail is located opposite to the circular edge of the passage.
3. The socket connector as recited in claim 1, wherein the curvilinear tail has a curvilinear lobe.
4. The socket connector as recited in claim 3, wherein a waveform arrangement formed at the solder portion creating a curvilinear slope and a peak.
5. The socket connector as recited in claim 4, which a substantially equilateral triangle is defined by the edge of the passage, the peak of the waveform, and a tip of the curvilinear lobe.
6. The socket connector as recited in claim 5, wherein the solder mass is a solder ball, and a center of the solder ball is located within the equilateral triangle.
7. The socket connector as recited in claim 6, wherein the solder ball has its spherical edge substantially matched with the curvilinear slope.
8. The socket connector as recited in claim 3, wherein a tip of the curvilinear lobe pierces into the solder mass.
9. The socket connector as recited in claim 1, wherein after the solder ball is melted, the curvilinear slope of the tail portion is enclosed within the solder ball.
10. The socket connector as recited in claim 1, wherein the tail portion defines a neck increasing the flexibility thereof.
11. The socket connector as recited in claim 1, wherein the insulative defines a mating interface in which a standoff associated with each of the passageway.
12. The socket connector as recited in claim 1, wherein the circular edge of the passageway defines a notch opposite to the curvilinear tail.
13. The socket connector as recited in claim 4, wherein the wave arrangement is located within the passageway.
14. A socket connector, comprising:
an insulative housing having a mating interface and a mounting face opposite to each other, and an array of passageways extending from the mating interface to the mounting face and having a lower edge;
a plurality of contact terminals each disposed within one of the array of passageways and having a contact engaging portion extending beyond the mating interface, and a curvilinear solder portion extending beyond the mounting face; and
a plurality of solder balls each disposed between a lower edge of the passageway and the curvilinear solder portion.
15. The socket connector as recited in claim 14, wherein the curvilinear solder portion includes a curvilinear lobe and a peak creating a first slope to the curvilinear lobe, and a second slope substantially symmetrical to the first slope centered on the peak.
16. The socket connector as recited in claim 15, wherein the solder mass is a solder ball having a side substantially in contact with the peak, the first slope and the curvilinear lobe.
17. The socket connector as recited in claim 15, wherein the curvilinear lobe is completely embedded within the solder mass after which is reflowed.
18. The socket connector as recited in claim 15, wherein contact terminal includes a base portion retained in the passageway, and the peak is offset from the base portion.
19. The socket connector as recited in claim 14, wherein the lower edge of passageways has an inclined surface to hold the solder mass located opposite to the contact terminal.
20. The socket connector as recited in claim 15, wherein the curvilinear lobe has a curvilinear end cradling the solder mass.
21. A socket connector, comprising:
an insulative housing having a mating interface and a mounting face opposite to each other, and an array of passageways extending from the mating interface to the mounting face and having a curvilinear edge;
a plurality of contact terminals each disposed within the array of passageways and having a contact engaging portion extending beyond the mating interface, and a solder portion having a curvilinear supporting area; and
a plurality of solder balls each securely arranged between the curvilinear edge and the curvilinear supporting area of the contact.
22. The socket connector as recited in claim 21, wherein a standoff is provided and associated with each of the contact engaging portion preventing the contact terminal portion from collapsing.
23. The socket connector as recited in claim 21, wherein the curvilinear edge and the curvilinear supporting area are orthogonal to each other.
24. The socket connector as recited in claim 21, wherein the solder portion is plated with a layer of material having solder affinity.
25. A socket connector, comprising:
an insulative housing defining a mating interface surrounded with peripheral walls and a mounting surface;
a plurality of passageways defined between the mating interface and the mounting surface and having an opening at the mounting surface;
an encampment associated with each of the passageway at the mounting surface, and including an extension crossing over an inner wall of the passageway to substantially narrow the opening of the opening;
a plurality of contact terminals each received in the passageway and having a curvilinear solder portion extending beyond the mounting surface; and
a plurality of solder balls each disposed between the encampment and the curvilinear solder portion.
26. The socket connector as recited in claim 25, the extension includes an inclined surface directing the solder ball toward the curvilinear solder portion.
27. The socket connector as recited in claim 25, wherein the curvilinear solder portion a curvilinear lobe at an end of the curvilinear solder portion.
28. The socket connector as recited in claim 27, wherein the curvilinear solder portion further includes a wave arrangement including a peak, a first slope and a second slope substantially symmetrical to the first slope centered on the peak.
29. The socket connector as recited in claim 28, wherein the wave arrangement includes a second peak at the first slope in a direction opposite to the first peak directing the curvilinear lobe closer the solder ball.
30. The socket connector as recited in claim 25, wherein every four adjacent passageways arranged in two rows is provided with a circular node in a center thereof.
31. The socket connector as recited in claim 30, wherein the circular node is selectively arranged with a blind hole smoothing the molten plastic flow of the insulative housing during molding process.
32. The socket connector as recited in claim 25, wherein the solder portion is plated with a layer of material having solder affinity.
33. The socket connector as recited in claim 32, wherein the material of solder affinity is layer of gold.
34. The socket connector as recited in claim 25, wherein a center of the solder ball is located above a line drawn from a lower point of the extension to a tip of the solder tail.
35. The socket connector as recited in claim 28, the peak of the wave arrangement and the extension jointly defines a narrowest passage entering the passageway.