1. A combustion engine, comprising:
a crankcase defining a journal area and an oil sump;
a cylinder communicating with the crankcase;
a cam chain chamber discrete from the crankcase;
a crankshaft journalled in the journal area of the crankcase, with a first end extending into the cam chain chamber and a second end extending through the crankcase;
a piston positioned in the cylinder;
a head above the cylinder having at least one camshaft therein operating valves in the head;
a first gear positioned on the crankshaft first end and positioned in the cam chain chamber;
a second gear positioned on an end of the cam;
a chain entrained around the first and second gear; and
an oil distribution member for distributing oil in the oil sump onto the cam chain for delivering lubrication oil to the head.
2. The combustion engine of claim 1, wherein the oil distribution member is positioned adjacent the first gear.
3. The combustion engine of claim 1, wherein the first gear is provided in a gear set positioned on the crankshaft first end, further comprising a third gear in meshing engagement with the gear set, and the oil distribution member is positioned intermediate the first and third gears.
4. The combustion engine of claim 1, further comprising a port communicating between the crankcase and the cam chain chamber; and a valve allowing the flow of blow by gases, compressed gases and oil into the cam chain chamber when the piston is moving from a top dead center position to a bottom dead center position.
5. The combustion engine of claim 1, wherein the camshaft operates on bearings in the heads.
6. The combustion engine of claim 5, wherein the bearings are roller bearings.
7. The combustion engine of claim 1, further comprising an oil distribution member within the head to deliver oil to the cam lobes.
8. The combustion engine of claim 1, wherein the oil distribution member is positioned in the cam chain chamber.
9. The combustion engine of claim 8, wherein the oil distribution member is positioned to collect oil from the first gear and to distribute the oil onto the cam chain.
10. The combustion engine of claim 1, wherein the oil distribution member includes a flange coupled to a wall of the engine.
11. The combustion engine of claim 1, wherein the oil distribution member is in a fixed position relative to the crankcase.
12. The combustion engine of claim 1, wherein the oil distribution member is decoupled from rotation of the first and second gears.
13. A combustion engine, comprising:
a crankcase defining a journal area and an oil sump;
a cylinder communicating with the crankcase;
a cam chain chamber discrete from the crankcase;
a crankshaft journalled in the journal area of the crankcase, with a first end extending into the cam chain chamber and a second end extending through the crankcase;
a piston positioned in the cylinder;
a head above the cylinder having at least one camshaft therein operating valves in the head;
a first gear positioned on the crankshaft first end and positioned in the cam chain chamber;
a second gear positioned on an end of the cam;
a chain entrained around the first and second gear; and
an oil distribution member within the head to deliver oil to the cam lobes.
14. The combustion engine of claim 13, wherein the oil distribution member is positioned adjacent the second gear.
15. The combustion engine of claim 13, wherein the oil distribution member comprises a tray positioned adjacent to the second gear which collects oil from the second gear.
16. The combustion engine of claim 15, wherein the tray includes at least one opening adjacent to cam lobes on the camshaft.
17. The combustion engine of claim 15, wherein the tray includes a window positioned adjacent to the second gear allowing oil to enter the tray from the rotating chain.
18. A combustion engine, comprising:
a crankcase defining a journal area and an oil sump;
a cylinder communicating with the crankcase;
a crankshaft journalled in the journal area of the crankcase, the crankshaft having a first end and a second end;
a piston positioned in the cylinder;
a head above the cylinder having a camshaft therein operating at least one valve in the head;
a first gear positioned on the first end of the crankshaft;
a second gear positioned on an end of the cam;
a chain entrained around the first gear and the second gear; and
a tray positioned within the head to collect oil from the chain and to deliver the collected oil to the camshaft, wherein the tray includes a floor portion configured to collect the oil from the chain.
19. The combustion engine of claim 18, wherein the tray is positioned adjacent the second gear.
20. The combustion engine of claim 18, wherein the tray includes an opening positioned adjacent to the second gear allowing oil to enter the tray from the rotating chain.
21. The combustion engine of claim 18, wherein the camshaft includes a cam lobe, and the tray distributes the collected oil onto the cam lobe.
22. The combustion engine of claim 21, wherein the tray includes at least one opening adjacent to the cam lobe on the camshaft for distributing the oil onto the cam lobe.
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 self-locking drill chuck comprising a body, a nut, a plurality of jaws, a front sleeve, a rear sleeve, a nut jacket, and a rolling member, wherein the plurality of jaws are respectively installed in angled bores uniformly distributed around the body, the threads of the nut and the threads of the jaws installed in the angled bores of the body constitute and a thread driving mechanism, and the front sleeve is fixedly connected to the body, wherein, the self-locking drill chuck further comprises:
a ratchet wheel fixedly mounted at a rear portion of the chuck body;
a disk spring arranged between the rolling member and a load carrying shoulder of the chuck body; and
a plurality of positioning key slots and annular connecting groove arranged in a front end of the chuck body;
wherein a driving groove and a plurality of keys are defined at a rear end of the nut jacket and a locking elastic element and a driving elastic element are respectively mounted on the plurality of keys; a control ring is fixedly mounted on the rear sleeve and formed with a plurality of driving keys and a cam face of a plurality of bulged portions and curved teeth; and the plurality of positioning keys and connecting clips are formed in an internal surface of the front sleeve.
2. The self-locking drill chuck as recited in claim 1, wherein the locking elastic element and the driving elastic element are integrated with the rear end of the nut jacket.
3. The self-locking drill chuck as recited in claim 1, wherein the control ring is integrated with the rear sleeve.
4. The self-locking drill chuck as recited in claim 1, wherein a minimum gap between the disk spring and the load carrying shoulder of the body is determined according to the axial deformation of the disk spring under the axial pressure which is generated by 50 to 95 percent of the designed maximum gripping force of the self-locking drill chuck.