I claim:
1. A two-stroke internal combustion engine with crankcase scavenging, with an exhaust passage controlled by a piston and at least two first transfer passages and at least one second transfer passage, each with a transfer window into a cylinder chamber and a crankcase-side window for communication between the cylinder chamber and a crankcase, the transfer windows of the first transfer passages being controlled by the upper edge of the piston, and the crankcase-side window of the second transfer passage being disposed in a region of a cylinder wall that is swept by a piston skirt of the piston, wherein for control of the second transfer passage the piston skirt of the piston is provided with a control opening in the area of the crankcase-side window of the second transfer passage, wherein said cylinder wall comprises at least one recess, wherein at least one injector opens into said recess being arranged in close vicinity to said transfer window of said second transfer passage, and wherein a narrow passage is arranged between said recess and said second transfer passage.
2. The two-stroke internal combustion engine according to claim 1, wherein the narrow passage is shaped by at least one groove in the cylinder wall between said recess and said transfer window of said second transfer passage.
3. The two-stroke internal combustion engine according to claim 1, wherein the narrow passage is configured as a gap, which is shaped by a separating edge dividing the recess from said transfer window of said second transfer passage.
4. The two-stroke internal combustion engine according to claim 3, wherein the distance between separating edge and cylinder axis is larger than the distance between cylinder wall and cylinder axis.
5. The two-stroke internal combustion engine according to claim 3, wherein the separating edge is arranged at right angle to the cylinder axis.
6. The two-stroke internal combustion engine according to claim 1, wherein the recess is disposed above the transfer window of the second transfer passage on the side of a combustion chamber top.
7. The two-stroke internal combustion engine according to claim 1, wherein at least two injectors open into one recess.
8. The two-stroke internal combustion engine according to claim 1, wherein the narrow passage is shaped by at least one duct being formed in a cylinder casing.
9. The two-stroke internal combustion engine according to claim 1, wherein a jet axis of the fuel injector forms an angle of 20 to 140 with a cylinder axis.
10. The two-stroke internal combustion engine according to claim 1, wherein the directions of the jet axis and the injector axis differ.
11. The two-stroke internal combustion engine according to claim 1, wherein at least two second transfer passages are disposed on the side of the exhaust passage.
12. An two-stroke internal combustion engine according to claim 1, wherein the injector opening into at least one recess faces a half of the cylinder chamber opposite of the exhaust passage.
13. The two-stroke internal combustion engine according to claim 1, wherein at least one second transfer passage is disposed on the side of the cylinder opposite of the exhaust passage.
14. The two-stroke internal combustion engine according to claim 1, wherein the second transfer passage is positioned in a symmetry plane containing an exhaust passage axis and the cylinder axis.
15. The two-stroke internal combustion engine according to claim 1, wherein at least two second transfer passages are positioned outside of the symmetry plane containing the exhaust passage axis and the cylinder axis.
16. The two-stroke internal combustion engine according to claim 1, wherein the jet axis of the injectorseen in the direction towards the cylinder axis’is directed onto an exhaust window of the exhaust passage.
17. The two-stroke internal combustion engine according to claim 1, wherein the jet axis of the injectorseen in the direction towards the cylinder axisis directed onto a diametrically opposed transfer window of a transfer passage.
18. The two-stroke internal combustion engine according to claim 1, wherein an upper edge of the transfer window of the second transfer passage is at a smaller distance from a combustion chamber top than the upper edge of the transfer window of the first transfer passage.
19. The two-stroke internal combustion engine according to claim 1 with several injectors per cylinder, wherein the injection axes of the injectors disposed in second transfer passages have different angles relative to each other.
20. The two-stroke internal combustion engine according to claim 1 with several injectors per cylinder, wherein the injectors have different injection characteristics, at least one injector being configured as a full-load injector and at least one other injector as part-load injector.
21. The two-stroke internal combustion engine according to claim 1, wherein the transfer windows of the first and second transfer passages and a crankcase-side window of the at least one second transfer passage and the corresponding control opening are disposed such that the first and second transfer passages will be timed in different stroke positions of the piston.
22. The two-stroke internal combustion engine according to claim 1, wherein the injector is configured as a multi-jet unit.
23. The two-stroke internal combustion engine according to claim 1, wherein the injector is configured as a multi-jet unit with at least two fuel jets differing as regards fuel amounts and injection times.
24. A two-stroke internal combustion engine with crankcase scavenging, with an exhaust passage controlled by a piston and at least two first transfer passages and at least one second transfer passage, each with a transfer window into a cylinder chamber and a crankcase-side window for communication between the cylinder chamber and a crankcase, the transfer windows of the first transfer passages being controlled by the upper edge of the piston, and the crankcase-side window of the second transfer passage being disposed in a region of a cylinder wall that is swept by a piston skirt of the piston, wherein for control of the second transfer passage the piston skirt of the piston is provided with a control opening in the area of the crankcase-side window of the second transfer passage, wherein a separating edge is located in at least one second transfer passage between an upper and a lower edge of said second transfer window, said separating edge dividing the second transfer window into an upper and a lower region, the distance between separating edge and cylinder axis being larger than the distance between upper edge and the cylinder axis, and wherein at least one injector opens into the upper region of at least one second transfer passage, wherein the separating edge is shaped by a cross rib, and wherein the separating edge is arranged at right angle to the cylinder axis.
25. The two-stroke internal combustion engine according to claim 24, wherein a jet axis of the fuel injector forms an angle of 20 to 140 with a cylinder axis.
26. The two-stroke internal combustion engine according to claim 24, wherein the directions of the jet axis and the injector axis differ.
27. The two-stroke internal combustion engine according to claim 24, wherein at least two second transfer passages are disposed on the side of the exhaust passage.
28. An two-stroke internal combustion engine according to claim 24, wherein the injector opening into at least one second transfer passage faces a half of the cylinder chamber opposite of the exhaust passage.
29. The two-stroke internal combustion engine according to claim 24, wherein at least one second transfer passage is disposed on the side of the cylinder opposite of the exhaust passage.
30. The two-stroke internal combustion engine according to claim 24, wherein the second transfer passage is positioned in a symmetry plane containing an exhaust passage axis and the cylinder axis.
31. The two-stroke internal combustion engine according to claim 24, wherein at least two second transfer passages are positioned outside of the symmetry plane containing the exhaust passage axis and the cylinder axis.
32. The two-stroke internal combustion engine according to claim 24, wherein the jet axis of the injectorseen in the direction towards the cylinder axisis directed onto an exhaust window of the exhaust passage.
33. The two-stroke internal combustion engine according to claim 24, wherein the jet axis of the injectorseen in the direction towards the cylinder axisis directed onto a diametrically opposed transfer window of a transfer passage.
34. The two-stroke internal combustion engine according to claim 24, wherein an upper edge of the transfer window of the second transfer passage is at a smaller distance from a combustion chamber top than the upper edge of the transfer window of the first transfer passage.
35. The two-stroke internal combustion engine according to claim 24 with several injectors per cylinder, wherein the injection axes of the injectors disposed in second transfer passages have different angles relative to each other.
36. The two-stroke internal combustion engine according to claim 24 with several injectors per cylinder, wherein the injectors have different injection characteristics, at least one injector being configured as a full-load injector and at least one other injector as part-load injector.
37. The two-stroke internal combustion engine according to claim 24, wherein the transfer windows of the first and second transfer passages and a crankcase-side window of the at least one second transfer passage and the corresponding control opening are disposed such that the first and second transfer passages will be timed in different stroke positions of the piston.
38. The two-stroke internal combustion engine according to claim 24, wherein the injector is configured as a multi-jet unit.
39. The two-stroke internal combustion engine according to claim 24, wherein the injector is configured as a multi-jet unit with at least two fuel jets differing as regards fuel amounts and injection times.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
We claim:
1. A prefastened disposable absorbent article comprising an absorbent chassis which defines a front waist region, a rear waist region, a crotch region which extends between and connects said waist regions, a pair of longitudinally opposed end edges, and a pair of laterally opposed side edges, said absorbent article further comprising:
a) at least one stretch panel which is located in one of said waist regions of said absorbent chassis and which defines a waist edge, a pair of laterally opposed outboard edges which are located laterally beyond said side edges of said absorbent chassis, and an inward edge which is located longitudinally inward from said waist edge; and
b) a pair of primary fasteners which are located on said laterally opposed outboard edges of said stretch panel and which are releasably prefastened to an opposite waist region of said absorbent chassis to releasably engage said front waist region to said rear waist region to provide said prefastened disposable absorbent article.
2. The prefastened absorbent article of claim 1 wherein said absorbent article includes one of said stretch panels in each of said waist regions of said absorbent chassis.
3. The prefastened absorbent article of claim 1 wherein said stretch panel comprises a latent elastic material.
4. The prefastened absorbent article of claim 1 wherein said stretch panel comprises at least one elastic member which is applied to said stretch panel in a pretensioned configuration.
5. The prefastened absorbent article of claim 1 wherein said stretch panel is designed to elongate in a lateral direction at least about 30 percent to assist in positioning said prefastened disposable absorbent article about a wearer’s waist.
6. The prefastened absorbent article of claim 1 wherein said stretch panel is designed to elongate in a lateral direction at least about 50 percent to assist in positioning said prefastened disposable absorbent article about a wearer’s waist.
7. The prefastened absorbent article of claim 1 wherein said primary fasteners are hook and loop type fasteners.
8. The prefastened absorbent article of claim 1 and further comprising at least one attachment panel which is located on said opposite waist region wherein said primary fasteners are releasably engaged to said attachment panel.
9. The prefastened absorbent article of claim 1 wherein said inward edge of said stretch panel is linear.
10. The prefastened absorbent article of claim 1 wherein said inward edge of said stretch panel is curvilinear.
11. The prefastened absorbent article of claim 1 wherein said absorbent chassis includes an outer cover which comprises a necked nonwoven material.
12. The prefastened absorbent article of claim 1 wherein said stretch panel is attached to a bodyfacing surface of said absorbent article.
13. The prefastened absorbent article of claim 1 wherein said absorbent chassis includes an outer cover and a bodyside liner and wherein said stretch panel is incorporated between said outer cover and said bodyside liner.
14. The prefastened absorbent article of claim 1 wherein said stretch panel is attached to a garment facing surface of said absorbent article.
15. The prefastened absorbent article of claim 1 wherein said stretch panel is perforated along a pair of laterally directed lines on at least one of two laterally opposed sides of said stretch panel to provide at least one secondary fastener tab, said secondary fastener tab being configured to releasably engage said opposite waist region to further conform said waist regions to a wearer’s body after said prefastened disposable absorbent article is pulled on over a wearer’s hips.
16. The prefastened absorbent article of claim 15 wherein said secondary fastener tab defines a length in a lateral direction which is at least about 5 percent of a total lateral width of said stretch panel.
17. The prefastened absorbent article of claim 15 wherein both said primary fasteners and said at least one secondary fastener tab are hook and loop type fasteners.
18. The prefastened absorbent article of claim 1 wherein said inward edge of said stretch panel is substantially fully attached to said absorbent chassis.
19. The prefastened absorbent article of claim 1 wherein said stretch panel is located in said rear waist region of said absorbent chassis, and wherein said primary fasteners are configured to releasably engage said front waist region of said absorbent chassis.
20. A prefastened disposable absorbent article comprising an absorbent chassis which defines a front waist region, a rear waist region, a crotch region which extends between and connects said waist regions, a pair of longitudinally opposed end edges, and a pair of laterally opposed side edges, said absorbent article further comprising:
a) at least one stretch panel which is located in one of said waist regions of said absorbent chassis and which defines a waist edge, a pair of laterally opposed outboard edges which are located laterally beyond said side edges of said absorbent chassis, and an inward edge which is located longitudinally inward from said waist edge;
b) a pair of primary fasteners which are located on said laterally opposed outboard edges of said stretch panel and which are releasably prefastened to an opposite waist region of said absorbent chassis to releasably engage said front waist region to said rear waist region to provide said prefastened disposable absorbent article; and
c) a pair of passive side bonds which are located laterally inward of said primary fasteners on said one waist region and which releasably connect an overlapped portion of said one waist region to said opposite waist region to assist in maintaining said prefastened absorbent article in a prefastened condition.
21. The prefastened absorbent article of claim 20 wherein said passive side bonds releasably connect said overlapped portion of said one waist region to said side edges in said opposite waist region to assist in maintaining said prefastened absorbent article in said prefastened condition.
22. The prefastened absorbent article of claim 20 wherein said passive side bonds are located on said one waist region laterally inward from said primary fasteners a distance of at least about 1.0 centimeter.
23. The prefastened absorbent article of claim 20 wherein said overlapped portion of said one waist region defines an overlap distance of at least about 2.0 centimeters.
24. The prefastened absorbent article of claim 20 wherein said passive side bonds include at least one point bond.
25. The prefastened absorbent article of claim 24 wherein said point bond is an ultrasonic point bond.
26. The prefastened absorbent article of claim 20 wherein said passive side bonds define a peel strength of no more than about 1500 grams.
27. The prefastened absorbent article of claim 20 wherein said passive side bonds connect a body facing surface of said absorbent article in said one waist region to a garment facing surface of said absorbent article in said opposite waist region.
28. The prefastened absorbent article of claim 20 wherein said passive side bonds connect a body facing surface of said absorbent article in said one waist region to a body facing surface of said absorbent article in said opposite waist region.
29. The prefastened absorbent article of claim 20 wherein said stretch panel comprises a latent elastic material.
30. The prefastened absorbent article of claim 20 wherein said stretch panel is designed to elongate in a lateral direction at least about 30 percent to assist in positioning said prefastened disposable absorbent article about a wearer’s waist.
31. The prefastened absorbent article of claim 20 wherein said stretch panel is designed to elongate in a lateral direction at least about 50 percent to assist in positioning said prefastened disposable absorbent article about a wearer’s waist.
32. The prefastened absorbent article of claim 20 wherein said primary fasteners are hook and loop type fasteners.
33. The prefastened absorbent article of claim 20 wherein said stretch panel is attached to a body facing surface of said absorbent article.
34. The prefastened absorbent article of claim 20 wherein said absorbent chassis includes an outer cover and a bodyside liner and wherein said stretch panel is incorporated between said outer cover and said bodyside liner.
35. The prefastened absorbent article of claim 20 wherein said stretch panel is attached to a garment facing surface of said absorbent article.
36. The prefastened absorbent article of claim 20 wherein said stretch panel is perforated along a pair of laterally directed lines on at least one of two laterally opposed sides of said stretch panel to provide at least one secondary fastener tab, said secondary fastener tab being configured to releasably engage said opposite waist region to further conform said waist region to a wearer’s body after said prefastened disposable absorbent article is pulled on over a wearer’s hips.
37. The prefastened absorbent article of claim 36 wherein said at least one secondary fasteners tab defines a length in a lateral direction which is at least about 10 percent of a total lateral width of said stretch panel.
38. The prefastened absorbent article of claim 36 wherein both said primary fasteners and said at least one secondary fastener tab are hook and loop type fasteners.
39. The prefastened absorbent article of claim 20 wherein said inward edge of said stretch panel is substantially fully attached to said absorbent chassis.
40. A prefastened disposable absorbent article comprising an absorbent chassis which defines a front waist region, a rear waist region, a crotch region which extends between and connects said waist regions, a pair of longitudinally opposed end edges, and a pair of laterally opposed side edges, and at least one stretch panel which defines a waist edge which is superposed adjacent said end edge of said absorbent chassis in one of said waist regions, a pair of laterally opposed outboard edges which are located laterally beyond said side edges of said absorbent chassis, and an inward edge which is located longitudinally inward from said waist edge, said stretch panel comprising
a) a center bridge panel;
b) a pair of laterally opposed side panels which are connected to opposed lateral edges of said bridge panel and which extend laterally beyond said side edges of said absorbent chassis;
c) a pair of primary fasteners which are located on said laterally opposed outboard edges of said stretch panel and which are releasably prefastened to an opposite waist region of said absorbent chassis to releasably engage said front waist region to said rear waist region to provide said prefastened disposable absorbent article; and
d) a pair of passive side bonds which are located laterally inward of said primary fasteners on said one waist region and which releasably connect an overlapped portion of said one waist region to said opposite waist region to assist in maintaining said prefastened absorbent article in a prefastened condition.
41. The prefastened absorbent article of claim 40 wherein said side panels of said stretch panel are substantially non-elastomeric.
42. The prefastened absorbent article of claim 40 wherein said bridge panel defines a bridge panel width in a lateral direction which is at least about 10 percent of a width of said absorbent chassis.
43. The prefastened absorbent article of claim 41 wherein said bridge panel defines a bridge panel width in a lateral direction which is about equal to a width of said absorbent chassis, such that said bridge panel provides stretch in said one waist region and said side panels remain substantially non-elastomeric beyond said laterally opposed side edges of said absorbent chassis.
44. The prefastened absorbent article of claim 43 wherein said bridge panel is designed to elongate in a lateral direction at least about 30 percent to assist in positioning said prefastened disposable absorbent article about a wearer’s waist.
45. The prefastened absorbent article of claim 40 wherein said primary fasteners are hook and loop type fasteners.
46. The prefastened absorbent article of claim 40 wherein said stretch panel is attached to a body facing surface of said absorbent article.
47. The prefastened absorbent article of claim 40 wherein said absorbent chassis includes an outer cover and a bodyside liner and wherein said stretch panel is incorporated between said outer cover and said bodyside liner.
48. The prefastened absorbent article of claim 40 wherein said stretch panel is attached to a garment facing surface of said absorbent article.
49. The prefastened absorbent article of claim 40 wherein said stretch panel is perforated along a pair of laterally directed lines on at least one of two laterally opposed sides of said stretch panel to provide at least one secondary fastener tab, said secondary fastener tab being configured to releasably engage said opposite waist region to further conform said waist regions to a wearer’s body after said prefastened disposable absorbent article is pulled on over a wearer’s hips.
50. The prefastened absorbent article of claim 49 wherein said at least one secondary fastener tab defines a length in a lateral direction which is at least about 10 percent of a total lateral width of said stretch panel.
51. The prefastened absorbent article of claim 49 wherein both said primary fasteners and said at least one secondary fastener tab are hook and loop type fasteners.
52. The prefastened absorbent article of claim 40 wherein said inward edge of said stretch panel is substantially fully attached to said absorbent chassis.
53. A package of prefastened disposable absorbent articles comprising a container and a plurality of said prefastened disposable absorbent articles, each of which comprise an absorbent chassis which defines a front waist region, a rear waist region, a crotch region which extends between and connects said waist regions, a pair of longitudinally opposed end edges, and a pair of laterally opposed side edges, each of said absorbent articles further comprising:
a) at least one stretch panel which is located on one of said waist regions of said absorbent chassis and which defines a waist edge, a pair of laterally opposed outboard edges which are located laterally beyond said side edges of said absorbent chassis, and an inward edge which is located longitudinally inward from said waist edge; and
b) a pair of primary fasteners which are located on said laterally opposed outboard edges of said stretch panel and which are releasably prefastened to an opposite waist region of said absorbent chassis to releasably engage said front waist region to said rear waist region to provide said prefastened disposable absorbent article.
54. The package of prefastened absorbent articles of claim 53 wherein said absorbent articles further comprise a pair of passive side bonds which are located inward of said primary fasteners on said one waist region and which releasably connect an overlapped portion of said one waist region to said opposite waist region to assist in maintaining said prefastened absorbent article in a prefastened condition.
55. The package of prefastened absorbent articles of claim 53 wherein said stretch panel of said absorbent articles comprises:
a) a center bridge panel; and
b) a pair of laterally opposed side panels which are connected to opposed lateral edges of said bridge panel and which extend laterally beyond said side edges of said absorbent chassis.
56. The package of refastened absorbent articles of claim 53 wherein said stretch panel of said absorbent articles is perforated along a pair of laterally directed lines on at least one of two laterally opposed sides of said stretch panel to provide at least one secondary fastener tab, said secondary fastener tab being configured to releasably engage said opposite waist region to further conform said waist regions to a wearer’s body after said prefastened disposable absorbent article is pulled on over a wearer’s hips.