Camshaft adjuster having a variable-length insert part

Abstract

A vane-type, hydraulic cam shaft adjuster (1, 20) having a stator (2) and a rotor that is rotatably mounted in relation to the stator (2), wherein at least one locking bolt (10) is provided in order to limit the rotor in relation to the stator (2), in at least one direction of rotation, when the locking bolt is brought into contact with a slot guide (12) of an insert part (4, 21), wherein the insert part (4, 21) is secured in a component (2) that is secured to the stator, wherein the insert part has securing regions, between which securing regions and the component (2) that is secured to the stator there is frictional connection, and wherein the insert part (4, 21) is formed, in terms of material and geometrics, in such a way that a deformation (19) causes a change in length (18) of the insert part (4, 21), involving the friction connection.

Claims

1. A vane-cell hydraulic camshaft adjuster comprising: a stator and a rotor, the rotor being mounted rotatably relative to the stator; and at least one locking bolt provided to limit the rotor in relation to the stator at least in one rotating direction when the locking bolt makes contact with a gate of an insert part, the insert part being attached in a component fixed to the stator, the insert part including attachment areas via which a force fit with the component fixed to the stator prevails, the insert part being designed in such a way in terms of material and geometry that a deformation brings about an elongation of the insert part, the elongation resulting in the force fit, wherein an at least elastic deformation is present on the insert part prior to the attachment and is at least partially cancelled after the attachment.

2. The camshaft adjuster as recited in claim 1 wherein the insert part includes a deformation area including at least two members between the attachment areas, each of the at least two members connecting the attachment areas to one another, and sections of the insert part being coordinated with one another in such a way that an at least elastic deformation of the at least two members toward one another or away from one another brings about the elongation.

3. The camshaft adjuster as recited in claim 1 wherein the attachment areas project from a direction of the elongation.

4. The camshaft adjuster as recited in claim 1 wherein the at least one locking bolt includes two locking bolts provided to limit a rotational movement of the rotor in relation to the stator when the locking bolts each make contact with one gate of the insert part.

5. The camshaft adjuster as recited in claim 1 the at least one locking bolt is arranged to limit the rotor in relation to the stator at least in the one rotating direction in a central locking position.

6. A vane-cell hydraulic camshaft adjuster comprising: a stator and a rotor, the rotor being mounted rotatably relative to the stator; and at least one locking bolt provided to limit the rotor in relation to the stator at least in one rotating direction when the locking bolt makes contact with a gate of an insert part, the insert part being attached in a component fixed to the stator, the insert part including attachment areas via which a force fit with the component fixed to the stator prevails, the insert part being designed in such a way in terms of material and geometry that a deformation brings about an elongation of the insert part, the elongation resulting in the force fit, the camshaft adjuster further comprising a deformation part separate from the insert part and introduced in the insert part, the deformation part when introduced effectuating the deformation of the insert part.

7. The camshaft adjuster of claim 6 wherein the deformation part is a pin, a screw or a cone.

8. The camshaft adjuster of claim 7 wherein the deformation part is composed of a solid material or a hollow material.

9. The camshaft adjuster as recited in claim 6 wherein the deformation part has a lobed or eccentric outer contour so that the deformation part is introduced with play, the deformation being caused by a rotation of the deformation part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention is described hereafter in greater detail with the aid of two exemplary embodiments.

(2) FIG. 1 shows a perspective view of a sprocket including an inserted insert part according to the first specific embodiment of the present invention;

(3) FIG. 2 shows an enlarged view of the area of FIG. 1 denoted by II;

(4) FIG. 3 shows a perspective view of a sprocket according to the first specific embodiment;

(5) FIG. 4 shows an enlarged view of the area of FIG. 3 denoted by IV;

(6) FIG. 5 shows a top view onto an insert part according to the first specific embodiment;

(7) FIG. 6 shows a perspective view of an insert part according to the first specific embodiment;

(8) FIG. 7 shows a perspective view of a sprocket including an inserted insert part and including two locking bolts according to the first specific embodiment;

(9) FIG. 8 shows an enlarged view of the area of FIG. 7 denoted by VIII;

(10) FIG. 9 shows a perspective view of a sprocket including an inserted insert part and including a deformation part according to a second specific embodiment of the present invention; and

(11) FIG. 10 shows an enlarged view of the area of FIG. 9 denoted by X.

DETAILED DESCRIPTION

(12) The figures are only of a schematic nature and provide only a better understanding of the present invention. Identical elements are denoted by the same reference numerals. Elements of the individual exemplary embodiments may be exchanged among one another.

(13) Hereafter, a first specific embodiment of the present invention is described with reference to FIG. 1 through FIG. 8. A hydraulic camshaft adjuster 1 including a stator 2 is shown. A rotor is provided, but not shown. Stator 2 is formed by a sprocket wheel. An insert part 4 is provided in a recess 3 of stator 2. Insert part 4 according to the first specific embodiment is shown in FIGS. 1 through 2 and 5 through 8.

(14) Recess 3, which is provided in the form of an annular closed groove, for example, is provided with hydraulic groove sections 5 and 6, locking bolt engagement sections 7 and 8, and an insert section 9.

(15) The first specific embodiment shows a camshaft adjuster for central locking. Accordingly, two locking bolts 10 engage in locking bolt engagement sections 7 and 8. Furthermore, two gate areas 11 are accordingly provided on insert part 4. A respective gate 12 is formed in gate areas 11 as a surface section of insert part 4.

(16) In FIG. 7 and FIG. 8, locking bolts 10 may be seen in the locking position, locking bolts 10 via their respective lateral surfaces or outer contours abutting and making contact with gates 12 of insert part 4.

(17) In the figures, recess 3 including sections 5 through 9 is shown open. In the fully assembled camshaft adjuster, however, recess 3 is sealingly closed, and a hydraulic pressure may be applied thereto via a hydraulic medium supply line, which is not shown. Bolts 10 may be pushed out of the locking position by the hydraulic pressure approximately along the bolt center line.

(18) Two attachment areas 13 are furthermore provided on insert part 4. On attachment areas 13, attachment sections 14 are formed as surface sections of insert part 4. Furthermore, attachment sections 15 are provided on sprocket 2 in the transition from locking bolt engagement sections 7 and 8 to insert section 9. Attachment sections 15 are designed in a complementary manner to attachment sections 14. As is apparent from the representation of FIGS. 7 and 8, bolts 10 push attachment areas 13 and attachment sections 14 onto attachment sections 15 of stator 2 with the aid of gates 12 and gate areas 11. Attachment forces occur between attachment sections 14 and 15. A force fit is thus generated in such a way that insert part 4 is attached in recess 3. Locking forces intensify the attachment forces.

(19) A deformation area 16 including two deformation members 17 or including two members 17 of insert part 4 are provided between attachment sections 14 of attachment areas 13. Members 17 extend in an elongation direction 18, members 17 having a convex shape to elongation direction 18. For the sake of clarity, elongation direction 18 is shown only in FIG. 5. When members 17 are now compressed by a force, which is represented by force arrows 19 in FIG. 5, attachment areas 13 are moved in elongation direction 18. In this respect, an elastic deformation of insert part 4 brings about an elongation of insert part 4. If in the geometry of insert part 4 shown in the first specific embodiment the force in the direction of force arrows 19 is cancelled, and insert part 4 is inserted into insert section 9, attachment sections 14 and 15 make contact with one another in a force-fit manner. In this way, by causing an elastic deformation in the direction of force arrows 19 an elongation of insert part 4 may be brought about, resulting in a force fit.

(20) Hereafter, a second specific embodiment of the present invention is addressed based on FIGS. 9 and 10. To avoid redundancies, only differences of the second specific embodiment compared to the first specific embodiment are described as far as possible.

(21) FIGS. 9 and 10 show a camshaft adjuster 20. In camshaft adjuster 20, an insert part 21 has been inserted into stator 2. Insert part 21 includes the two gate areas 11 having one gate 12 each, the two attachment areas 13 having one attachment section 14 each, and the deformation area 16 having two deformation members 22.

(22) During assembly, insert part 21 is inserted into recess 3 of stator 2 without force and/or with play. Then, a deformation part 23 is pressed between the two members 22. Deformation part 23 has the shape of a chamfered bolt here. By pressing deformation part 23 between the two members 22, the two members 22 are pushed apart and elastically-plastically deformed.

(23) The elastic-plastic deformation of insert part 21 generated with the aid of deformation part 23 has a greater magnitude of deformation compared to insert part 4 of the first specific embodiment. In this way, the clearance fit between insert part 21 and recess 3 may be designed to have a lot of play, and insert part 21 may be inserted into stator 2 quickly and with only little precision. Insert part 21 of the second specific embodiment may thus be manufactured with lower tolerance requirements than insert part 4 of the first specific embodiment. Moreover, the work steps inserting and deforming are chronologically separated from one another. In this way, an insertion tool may be dispensed with, for example.

(24) The deformation of members 22 effectuates/brings about an elongation of insert part 21 that is perpendicular to the elongation 18 of insert part 4 shown in FIG. 5. As a result, attachment areas 13 are pulled toward one another, so that attachment sections 14 of insert part 21 and attachment sections 15 of stator 2 make contact with one another in a force-fit manner. Insert part 21 is thus attached to stator 2 in a force-fit manner. Insert part 21 is no longer able to fall out of stator 2 during the subsequent assembly steps.

(25) In this respect, insert part 21 may be introduced with play into stator 2 of camshaft adjuster 20 in the second specific embodiment, and a force-fit interference fit between insert part 21 and stator 2 is ensured with the aid of deformation part 23.

(26) According to one refinement of the second specific embodiment, which is not shown in the figures, an insert part having a one-member deformation area may be provided. In this case, the deformation part is pressed between a surface of insert section 9 and the deformation area, bringing about the deformation and thus an elongation of the insert part and resulting in a force fit.

LIST OF REFERENCE NUMERALS

(27) 1 camshaft adjuster 2 stator 3 recess 4 insert part 5, 6 hydraulic groove sections 7, 8 locking bolt engagement section 9 insert section 10 locking bolt 11 gate area 12 gate 13 attachment area 14, 15 attachment section 16 deformation area 17 member 18 elongation direction 19 force arrow 20 camshaft adjuster 21 insert part 22 member 23 deformation part