Camshaft adjusting system

Abstract

A camshaft adjusting system (1) having a camshaft adjuster (2) and a camshaft (3), wherein the camshaft adjuster (2) has a drive element (4) and an output element (5) which is disposed so as to be pivotably movable with respect to the drive element (4), wherein the output element (5) is non-rotatably connected to the camshaft (3), wherein a cover element (6) is fastened non-rotatably to the output element (5) and the hub (9) of the cover element (6) is disposed between the output element (5) and the camshaft (3), wherein the radial direction of extension of the cover element (6) is greater than the diameter of the contact surface (10) of the hub (9) of the cover element (6) to the camshaft (3).

Claims

1. A camshaft adjusting system comprising: a camshaft adjuster; a camshaft, the camshaft adjuster including a driving element and an output element situated so as to be pivotably movable with respect to the driving element, the output element being rotatably fixedly connected to the camshaft; and a cover element rotatably fixedly connected to the output element, the cover element having a hub situated between the output element and the camshaft, a radial direction of extension of the cover element being larger than a diameter of a contact surface of the hub to the camshaft.

2. The camshaft adjusting system as recited in claim 1 wherein the cover element is designed as a trigger wheel or as a spring cover.

3. The camshaft adjusting system as recited in claim 1 wherein the cover element covers a spring of the camshaft adjuster and is a trigger wheel.

4. The camshaft adjusting system as recited in claim 1 wherein the hub is provided with friction-increasing means.

5. The camshaft adjusting system as recited in claim 1 wherein the cover element is completely provided with a friction-increasing layer.

6. The camshaft adjusting system as recited in claim 1 further comprising a friction-increasing means, the friction-increasing means being a coating or a topographic structure of a surface of the cover element.

7. The camshaft adjusting system as recited in claim 1 wherein a contact surface of the cover element to the camshaft has a higher roughness than the rest of the cover element.

8. The camshaft adjusting system as recited in claim 1 wherein the hub (9) of the cover element is followed by a centering section centering the cover element with respect to the camshaft or to the output element.

9. A camshaft adjuster of a camshaft adjusting system, the camshaft adjuster comprising: a driving element and an output element situated so as to be pivotably movable with respect to the driving element, the output element being rotatably fixedly connected to the camshaft; and a cover element rotatably fixedly connected to the output element, the cover element having a hub situated between the output element and the camshaft, a radial direction of extension of the cover element being larger than a diameter of a contact surface of the hub to the camshaft.

10. A cover element of a camshaft adjusting system having a driving element and an output element situated so as to be pivotably movable with respect to the driving element, the output element being rotatably fixedly connected to the camshaft, the cover element being rotatably fixedly connected to the output element and comprising: a hub situated between the output element and the camshaft, a radial direction of extension of the cover element being larger than a diameter of a contact surface of the hub to the camshaft.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Exemplary embodiments of the present invention are illustrated in the figures.

(2) FIG. 1a shows a camshaft adjusting system having a camshaft adjuster and a camshaft, and a cover element designed as a trigger wheel,

(3) FIG. 1b shows the cover element designed as a trigger wheel according to FIG. 1a,

(4) FIG. 2a shows a camshaft adjusting system having a camshaft adjuster and a camshaft and a cover element designed as a spring cover, and

(5) FIG. 2b shows the cover element designed as a spring cover according to FIG. 2a.

DETAILED DESCRIPTION

(6) FIG. 1a shows a camshaft adjusting system 1 having a camshaft adjuster 2 and a camshaft 3 and a cover element 6 designed as a trigger wheel 7.

(7) Camshaft adjuster 2 is mounted with the aid of a coaxially positioned central screw 13 to camshaft 3 and thus forms camshaft adjusting system 1. In particular output element 5 designed as a rotor is rotatably fixedly connected to trigger wheel 7 and camshaft 3 by central screw 13. According to the present invention, trigger wheel 7 is clamped with its hub 9 between output element 5 and camshaft 3. In this configuration, the circular contact surface 10, which is formed on the side of hub 9 facing away from the rotor, makes contact with camshaft 3. The circular contact surface 14, which is situated on the side of hub 9 facing away from the camshaft, makes contact with output element 5. At least one of contact surfaces 10 or 14 is provided with friction-increasing means, such as a friction-increasing layer or a friction-increasing structure or a film element having a friction-increasing layer or structure. In this way, a higher torque may be transmitted in the screw connection, or the screw force for the transmission of the required torque may be reduced.

(8) Spring 15, which braces driving element 4 to output element 5 in the circumferential direction, is situated on the side of camshaft adjuster 2 facing away from the camshaft.

(9) Trigger wheel 7 has a centering section 11 which sits or may sit on camshaft 3 with its lateral surface 12. Via this centering section 11, camshaft adjuster 2 may be centered with respect to camshaft 3, i.e., oriented coaxially toward one another.

(10) With its radial extension, trigger wheel 7 covers nearly the entire camshaft adjuster 2. At the radially outermost area of trigger wheel 7, trigger wheel 7 is angled in the axial direction and partially encloses a lateral surface of camshaft adjuster 2.

(11) FIG. 1b shows cover element 6 designed as trigger wheel 7 according to FIG. 1a.

(12) Trigger wheel 7 has a hub 9 which is interspersed with a circular bore. Hub 9 is followed by a centering section 11. Hub 9 forms a circular contact surface 14 on an axial front side for output element 5 and a circular contact surface 10 on the aforementioned axial front side opposite of the axial front side for camshaft 3. With the axial extension of centering section 11, a lateral surface 12 is formed which may cooperate with a complementary lateral surface of camshaft 3 or output element 5. Furthermore, trigger wheel 7 has three material recesses 16 distributed across its circumference.

(13) Trigger wheel 7 may be provided entirely with friction-increasing means, such as a friction-increasing layer or a friction-increasing structure or a film element having a friction-increasing layer or structure. Alternatively, hub 9 only, or, in particular, contact surfaces 10 and/or 14 provided for the contact, may be provided with friction-increasing means such as a friction-increasing layer or a friction-increasing structure or a film element having a friction-increasing layer or structure. Optionally, the friction-increasing means, such as a friction-increasing layer or a friction-increasing structure or a film element having a friction-increasing layer or structure, may extend from hub 9 also to centering section 11 and include the same.

(14) FIG. 2a shows a camshaft adjusting system 1 having a camshaft adjuster 2 and a camshaft 3 and a cover element 6 designed as a spring cover 8.

(15) Camshaft adjuster 2 is mounted with the aid of a coaxially positioned central screw 13 to camshaft 3 and thus forms camshaft adjusting system 1. In particular output element 5, designed as a rotor, is rotatably fixedly connected to spring cover 8 and camshaft 3 by central screw 13. According to the present invention, spring cover 8 is clamped with its hub 9 between output element 5 and camshaft 3. In this configuration, the circular contact surface 10, which is formed on the side of hub 9 facing away from the rotor, makes contact with camshaft 3. The circular contact surface 14, which is situated on the side of hub 9 facing away from the camshaft, makes contact with output element 5. At least one of contact surfaces 10 or 14 is provided with friction-increasing means, such as a friction-increasing layer or a friction-increasing structure or a film element having a friction-increasing layer or structure. In this way, a higher torque may be transmitted in the screw connection, or the screw force for the transmission of the required torque may be reduced.

(16) Spring 15, which braces driving element 4 to output element 5 in the circumferential direction, is situated on the side of camshaft adjuster 2 facing the camshaft and is covered by spring cover 8.

(17) With its radial extension, spring cover 8 covers nearly the entire camshaft adjuster 2, in particular spring 15. Spring 15 is, as also in FIG. 1a, designed as a spring with radial coils and situated at the front side at camshaft adjuster 2. Moreover, spring 15 is positioned outside on camshaft adjuster 2, i.e., spring 15 is not completely encapsulated by a component, for example, driving element 4 or output element 5.

(18) Spring cover 8 has a centering section 11 which sits or may sit on camshaft 3 with its lateral surface 12. Via this centering section 11, camshaft adjuster 2 may be centered with respect to camshaft 3, i.e., oriented coaxially toward one another.

(19) FIG. 2b shows cover element 6 designed as spring cover 8 according to FIG. 2a.

(20) Spring cover 8 has a hub 9 which is interspersed with a circular bore. Hub 9 is followed by a centering section 11. Hub 9 forms a circular contact surface 14 on an axial front side for output element 5 and a circular contact surface 10 on the aforementioned axial front side opposite of the axial front side for camshaft 3. With the axial extension of centering section 11, a lateral surface 12 is formed which may cooperate with a complementary lateral surface of camshaft 3 or output element 5. Furthermore, spring cover 8 has multiple, in particular eight, material recesses 16 distributed across the circumference for weight decrease.

(21) Spring cover 8 may be provided entirely with friction-increasing means, such as a friction-increasing layer or a friction-increasing structure or a film element having a friction-increasing layer or structure. Alternatively, hub 9 only, or, in particular, contact surfaces 10 and/or 14 provided for the contact, may be provided with friction-increasing means such as a friction-increasing layer or a friction-increasing structure or a film element having a friction-increasing layer or structure. Optionally, the friction-increasing means, such as a friction-increasing layer or a friction-increasing structure or a film element having a friction-increasing layer or structure, may extend from hub 9 also to centering section 11 and include the same.

LIST OF REFERENCE NUMERALS

(22) 1) camshaft adjusting system 2) camshaft adjuster 3) camshaft 4) driving element 5) output element 6) cover element 7) trigger wheel 8) spring cover 9) hub 10) contact surface 11) centering section 12) lateral surface 13) central screw 14) contact surface 15) spring 16) material recesses