US4998523A — Injection timing adjuster for internal combustion…

Claim 1

Independent Claim 278 words

A rotating injection timing adjuster for internal combustion engines such as Diesel engines comprising a drive means (2) and a driven shaft (3), adjusting pistons (18) accommodated inside the rotating adjuster and actuatable counter to a restoring force by a pressure of a hydraulic medium, which pressure is controlled as a function of operating characteristics, the adjusting pistons being guided in outward-pointing cylinder bores (20) of a piston holder (9) disposed on a hub element (10) of said driven shaft (3), and a mutual rotational position of said drive means (2) and said driven shaft (3) is variable, by means of said adjusting pistons and by means of intermediate elements (22) and transmission elements attached to said intermediate elements, via a cam adjustment mechanism (12) that connects said drive means (2) to said driven shaft (3), wherein coupling elements (34) connected to the intermediate elements and said adjusting pistons (18) and disposed at right angles to the longitudinal axes (21) of the cylinder bores (20) serve as transmission elements for transmitting an adjusting motion of the adjusting pistons (18) to the intermediate elements (22), pins (28) attached to the intermediate elements (22) engage the cam adjusting mechanism (12) and serve as transmission elements between the intermediate elements (22) and the cam adjustment mechanism (12), said piston holder (9) includes limiting faces (26) extending parallel to the longitudinal axis (23) of the adjuster and parallel to the longitudinal axes (21) of the cylinder bores (20), and the intermediate elements (22) encompass the piston holder (9) in a U-shape on its limiting faces (26) and one end face and as a result are radially guided on the piston holder (9).

Claim 2

Dependent Claim 278 words

A rotating injection timing adjuster for internal combustion engines such as Diesel engines comprising a drive means (2) and a driven shaft (3), adjusting pistons (18) accommodated inside the rotating adjuster and actuatable counter to a restoring force by a pressure of a hydraulic medium, which pressure is controlled as a function of operating characteristics, the adjusting pistons being guided in outward-pointing cylinder bores (20) of a piston holder (9) disposed on a hub element (10) of said driven shaft (3), and a mutual rotational position of said drive means (2) and said driven shaft (3) is variable, by means of said adjusting pistons and by means of intermediate elements (22) and transmission elements attached to said intermediate elements, via a cam adjustment mechanism (12) that connects said drive means (2) to said driven shaft (3), wherein coupling elements (34) connected to the intermediate elements and said adjusting pistons (18) and disposed at right angles to the longitudinal axes (21) of the cylinder bores (20) serve as transmission elements for transmitting an adjusting motion of the adjusting pistons (18) to the intermediate elements (22), pins (28) attached to the intermediate elements (22) engage the cam adjusting mechanism (12) and serve as transmission elements between the intermediate elements (22) and the cam adjustment mechanism (12), said piston holder (9) includes limiting faces (26) extending parallel to the longitudinal axis (23) of the adjuster and parallel to the longitudinal axes (21) of the cylinder bores (20), and the intermediate elements (22) encompass the piston holder (9) in a U-shape on its limiting faces (26) and one end face and as a result are radially guided on the piston holder (9).

Claim 3

Dependent Claim 63 words

An injection timing adjuster as defined by claim 1, in which said intermediate elements (22) are embodied as U-shaped at right angles to the longitudinal axis (23) of the adjuster and substantially comprise a center portion (30) and walls (31) protruding vertically away from the center portion toward the piston holder (9) and parallel to the limiting faces (26) of the piston holder.

Claim 4

Dependent Claim 100 words

An injection timing adjuster as defined by claim 1, in which two adjusting pistons (18) on each side of the adjuster are disposed parallel to one another, and coupling pins 34 are used as coupling elements between the adjusting pistons (18) and the intermediate elements (22), said coupling pins (34) extend vertically to the longitudinal axis (23) of the adjuster and vertically to the longitudinal axes (21) of the cylinder bores (20) and said two adjusting pistons (18) disposed on each side of the adjuster are connected via a single, common coupling pin to one of the intermediate elements (22).

Claim 5

Dependent Claim 100 words

An injection timing adjuster as defined by claim 2, in which two adjusting pistons (18) on each side of the adjuster are disposed parallel to one another, and coupling pins 34 are used as coupling elements between the adjusting pistons (18) and the intermediate elements (22), said coupling pins (34) extend vertically to the longitudinal axis (23) of the adjuster and vertically to the longitudinal axes (21) of the cylinder bores (20) and said two adjusting pistons (18) disposed on each side of the adjuster are connected via a single, common coupling pin to one of the intermediate elements (22).

Claim 6

Dependent Claim 46 words

An injection timing adjuster as defined by claim 3, in which said coupling pins (34) are forced into bores (35a, b) of walls (31) and have a smaller diameter on their forward end (34a), which is introduced first upon assembly, than at their rearward end (34b).

Claim 7

Dependent Claim 46 words

An injection timing adjuster as defined by claim 4, in which said coupling pins (34) are forced into bores (35a, b) of walls (31) and have a smaller diameter on their forward end (34a), which is introduced first upon assembly, than at their rearward end (34b).

Claim 8

Dependent Claim 54 words

An injection timing adjuster as defined by claim 3, in which said adjusting pistons (18) have transverse bores (36) for passage of said coupling pins (34), which bores communicate via openings (38) in the adjusting pistons (18) with a region acted upon by pressure of the cylinder bores (20) between the adjusting pistons (18).

Claim 9

Dependent Claim 54 words

An injection timing adjuster as defined by claim 4, in which said adjusting pistons (18) have transverse bores (36) for passage of said coupling pins (34), which bores communicate via openings (38) in the adjusting pistons (18) with a region acted upon by pressure of the cylinder bores (20) between the adjusting pistons (18).

Claim 10

Dependent Claim 45 words

An injection timing adjuster as defined by claim 1, in which one cap element each is disposed above the cylinder bores in the piston holder, toward the outside, and one restoring spring (119) is fastened in place between each adjusting piston and the cap element.

Claim 11

Dependent Claim 45 words

An injection timing adjuster as defined by claim 2, in which one cap element each is disposed above the cylinder bores in the piston holder, toward the outside, and one restoring spring (119) is fastened in place between each adjusting piston and the cap element.

Claim 12

Dependent Claim 45 words

An injection timing adjuster as defined by claim 3, in which one cap element each is disposed above the cylinder bores in the piston holder, toward the outside, and one restoring spring (119) is fastened in place between each adjusting piston and the cap element.

Claim 13

Dependent Claim 45 words

An injection timing adjuster as defined by claim 5, in which one cap element each is disposed above the cylinder bores in the piston holder, toward the outside, and one restoring spring (119) is fastened in place between each adjusting piston and the cap element.

Claim 14

Dependent Claim 45 words

An injection timing adjuster as defined by claim 7, in which one cap element each is disposed above the cylinder bores in the piston holder, toward the outside, and one restoring spring (119) is fastened in place between each adjusting piston and the cap element.

Claim 15

Dependent Claim 60 words

An injection timing adjuster as defined by claim 1, which includes restoring springs for bringing to bear a restoring force for the adjusting pistons, in which on their ends (22a) facing one another, said intermediate elements (22) have brackets (22b) offstanding at right angles from their walls (31) and each receives one spring support (40) for the restoring springs (19).

Claim 16

Dependent Claim 60 words

An injection timing adjuster as defined by claim 2, which includes restoring springs for bringing to bear a restoring force for the adjusting pistons, in which on their ends (22a) facing one another, said intermediate elements (22) have brackets (22b) offstanding at right angles from their walls (31) and each receives one spring support (40) for the restoring springs (19).

Claim 17

Dependent Claim 60 words

An injection timing adjuster as defined by claim 3, which includes restoring springs for bringing to bear a restoring force for the adjusting pistons, in which on their ends (22a) facing one another, said intermediate elements (22) have brackets (22b) offstanding at right angles from their walls (31) and each receives one spring support (40) for the restoring springs (19).

Claim 18

Dependent Claim 60 words

An injection timing adjuster as defined by claim 4, which includes restoring springs for bringing to bear a restoring force for the adjusting pistons, in which on their ends (22a) facing one another, said intermediate elements (22) have brackets (22b) offstanding at right angles from their walls (31) and each receives one spring support (40) for the restoring springs (19).

Claim 19

Dependent Claim 60 words

An injection timing adjuster as defined by claim 5, which includes restoring springs for bringing to bear a restoring force for the adjusting pistons, in which on their ends (22a) facing one another, said intermediate elements (22) have brackets (22b) offstanding at right angles from their walls (31) and each receives one spring support (40) for the restoring springs (19).

Claim 20

Dependent Claim 60 words

An injection timing adjuster as defined by claim 6, which includes restoring springs for bringing to bear a restoring force for the adjusting pistons, in which on their ends (22a) facing one another, said intermediate elements (22) have brackets (22b) offstanding at right angles from their walls (31) and each receives one spring support (40) for the restoring springs (19).

Claim 21

Dependent Claim 60 words

An injection timing adjuster as defined by claim 7, which includes restoring springs for bringing to bear a restoring force for the adjusting pistons, in which on their ends (22a) facing one another, said intermediate elements (22) have brackets (22b) offstanding at right angles from their walls (31) and each receives one spring support (40) for the restoring springs (19).

Claim 22

Dependent Claim 60 words

An injection timing adjuster as defined by claim 8, which includes restoring springs for bringing to bear a restoring force for the adjusting pistons, in which on their ends (22a) facing one another, said intermediate elements (22) have brackets (22b) offstanding at right angles from their walls (31) and each receives one spring support (40) for the restoring springs (19).

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1994-03-11	1994-09-10	1995-03-12	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1998-03-11	1998-09-10	1999-03-12	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2002-03-11	2002-09-10	2003-03-12	$7700.00	Window Closed / Lapsed

Injection timing adjuster for internal combustion engines

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