WO2016000700A1

WO2016000700A1 - Camshaft adjuster

Info

Publication number: WO2016000700A1
Application number: PCT/DE2015/200281
Authority: WO
Inventors: Ahmet Deneri; Ali Bayrakdar
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2014-06-30
Filing date: 2015-04-27
Publication date: 2016-01-07
Also published as: DE102014212615B4; DE102014212615A1

Abstract

Disclosed is a camshaft adjuster (1) comprising an input element (2), an output element (3) and a cover element (4). A trigger wheel (5) is secured to the output element (3). The trigger wheel (5) includes a wire (6) forming at least one hook (7) which engages into a pocket (8) of the output element (3).

Description

Name of the invention

Phaser

description

Field of the invention

The invention relates to a camshaft adjuster.

Background of the invention

Camshaft adjusters are used in internal combustion engines for varying the timing of the combustion chamber valves in order to make the phase relation between a crankshaft and a camshaft in a defined angular range, between a maximum early and a maximum late position, variable. Adjusting the timing to the current load and speed reduces fuel consumption and emissions. For this purpose, camshaft adjuster are integrated into a drive train, via which a torque is transmitted from the crankshaft to the camshaft. This drive train can be formed, for example, as a belt, chain or gear drive.

In a hydraulic camshaft adjuster, the output element and the drive element form one or more pairs of mutually acting pressure chambers, which can be acted upon by hydraulic fluid. The drive element and the output element are arranged coaxially. By filling and emptying individual pressure chambers, a relative movement between the drive element and the output element is generated. The rotationally acting between the drive element and the output element spring urges the Anthebselement against the output element in an advantageous direction. This advantage direction can be the same or opposite to the direction of rotation. One type of hydraulic camshaft adjuster is the vane cell dispenser. The vane cell adjuster comprises a stator, a rotor and a drive wheel with an external toothing. The rotor is designed as a driven element usually rotatably connected to the camshaft. The drive element includes the stator and the drive wheel. The stator and the drive wheel are rotatably connected to each other or alternatively formed integrally with each other. The rotor is coaxial with the stator and located inside the stator. The rotor and the stator are characterized by their, radially extending wings, oppositely acting oil chambers, which are acted upon by oil pressure and allow relative rotation between the stator and the rotor. The vanes are either formed integrally with the rotor or the stator or arranged as "inserted vanes" in grooves of the rotor or the stator provided for this purpose Furthermore, the vane-cell adjusters have various sealing lids The stator and the sealing lids are secured together by a plurality of screw connections ,

Another type of hydraulic phaser is the axial piston phaser. Here, a displacement element is axially displaced via oil pressure, which generates a helical gear teeth relative rotation between a drive element and an output element.

Another design of a camshaft adjuster is the electromechanical camshaft adjuster, which has a three-shaft transmission (for example, a planetary gear). One of the shafts forms the drive element and a second shaft forms the output element. About the third wave, the system by means of an adjusting device, such as an electric motor or a brake, rotational energy supplied or removed from the system. A spring may additionally be arranged, which supports or returns the relative rotation between the drive element and output element. DE 10 2007 040 017 discloses a control timing device for an internal combustion engine, comprising a hub element, which has a seat provided on a camshaft end portion seat portion, an outer housing member, as such, the hub member and is pivotable relative to the hub member about a concentric to the camshaft axis pivot axis, an adjusting mechanism for effecting the pivoting of the outer housing element relative to the hub element and a plate element, which is clamped on the hub element via the camshaft central screw, wherein on the plate element an insert portion is formed, which is insertable into a countersink formed in the hub element, and in that At least one anchoring structure is formed in the region of the insert section by which the insert section is anchored to a counterstructure provided by the hub element.

Summary of the invention

The object of the invention is to provide a camshaft adjuster which has a particularly simple mounting of the trigger wheel.

According to the invention, this object is solved by the features of claim 1. Thus, to solve the problem, a camshaft adjuster is proposed, which has a drive element, an output element and, for example. On the camshaft remote side of the camshaft adjuster arranged cover element, wherein on the, for example. Camshaft side facing away from the cover element, a trigger wheel is arranged according to the invention thereby in that the trigger wheel has a resilient wire which forms at least one hook, which engages in a pocket of the output element. This ensures that the trigger easily and safely with the

Output element can be mounted or mounted. In addition, the trigger wheel can be rotated in the circumferential direction relative to the output element or the camshaft during assembly. The fastening between the trigger wheel and the driven element according to the invention limits the freedom of movement of the trigger wheel both in the radial and in the axial direction, at least insofar as a captive securing is provided, but permits one degree of freedom in the circumferential direction at least within a limited, ideally unrestricted, angular range.

As a wire and wire elements are understood that have a deviating from a circular cross-sectional shape cross-section, so for example. Oval, polygonal, square, rectangular, etc. The engaging in a pocket of the driven element hook, which is formed by the wire, can advantageously at one Support wall or digging wall of the bag to ensure a secure attachment of the trigger wheel with the output element. In one embodiment of the invention, the hook is designed as a barb and locked with an undercut, which is formed by an overlap of the lid member with the bag. Advantageously, such a built undercut is easy to form, in which the cover element at the area which is to cover the pocket has a smaller distance from the axis of rotation of the camshaft adjuster than the end of the hook or the limiting surface of the pocket, which of the cover element is covered. The lid member protrudes beyond a boundary surface of the bag and covers the mouth of the bag. In an advantageous embodiment, the wire has at least one turn, wherein the wire is secured captively by the radial bias of the winding with a hub of the trigger wheel. The winding may wrap around a hub of the trigger wheel or be disposed within the hub and Contact the inner peripheral surface of the hub. In both variants, the windings can be provided with a bias, so that the wire does not slip in the circumferential direction and the hook formed by the wire remains in the predetermined by the mounting of the wire with the trigger wheel position in the circumferential direction and possibly also in the axial direction.

In a particularly preferred embodiment, the trigger wheel has at least one tab which fixes the wire with the trigger wheel. Advantageously, the wire on the trigger wheel can be held captive with this tab, especially in the case that a turn of the wire does not contact the hub of the trigger wheel under bias.

In one embodiment of the invention, the pocket allows a rotatability in the circumferential direction between the trigger wheel and the driven element. Thus, the trigger can be advantageously rotated in the circumferential direction relative to the output element to selectively set a defined angular position between the trigger and the output element.

In a preferred embodiment, the wall of the trigger wheel on an opening, which is penetrated by the wire. Advantageously, the wire, which is provided for fastening the trigger wheel, are arranged on the side facing away from the driven element of the trigger wheel, wherein the end of the wire extends through the opening of the trigger wheel and can engage in the pocket of the output element for attachment of the trigger wheel. Preferably, so can the distance between the trigger wheel and

Output element can be reduced, whereby space is saved.

In a further embodiment of the invention, a camshaft adjusting device with a camshaft adjuster is proposed, wherein the camshaft adjusting device has a camshaft and the hub of the

Trigger wheel is penetrated by a central screw, which engages in the camshaft, wherein the output member, the camshaft and the trigger wheel rotatably clamped to each other by the central screw. According to the invention, a method for mounting a camshaft lenverstellers, which has a drive element, an output member and a cover member, wherein the output member is a trigger

is attachable, proposed with the following steps:

Provision of the trigger wheel with a hook having a hook as a preassembled unit,

Feeding this assembly to the phaser in the axial direction,

· Let the hook pass through the cover element and

• Dip the hook into a pocket of the output element.

According to the invention, a method for assembling a camshaft adjuster with a camshaft adjuster, which has a drive element, an output element and a cover element, wherein a trigger wheel can be fastened with the cover element, and with a camshaft, is proposed with the following steps:

• Provide the trigger wheel with a hook

Wire as a preassembled unit,

Feeding the assembly to the phaser in the axial direction,

• let the hook (7) pass through the cover element (4) and

• immerse in a pocket (8) of the driven element (3),

Feeding the camshaft adjuster with the assembled unit to the camshaft,

· Penetration of the camshaft adjuster from a central screw, which engages or is screwed into the camshaft,

• rotation of the trigger wheel relative to the output element or to the camshaft for adjusting an angular position between the trigger wheel and the camshaft before tightening the central screw,

· Fixation of the set angular position and tightening of the central screw, whereby the trigger wheel, the output element and the camshaft are connected in a torque-proof manner. According to the invention, a method for mounting a camshaft lenverstellvorrichtung and the camshaft adjuster with the aforementioned advantageous embodiments and with a camshaft, by the following steps:

· Supply of the camshaft adjuster with the already mounted

Trigger wheel to the camshaft,

Penetrating the camshaft adjuster and the trigger wheel from a central screw, which is then engaged or screwed into the camshaft,

· Rotation of the trigger wheel relative to the output element or the camshaft for adjusting an angular position between the trigger wheel and camshaft before tightening the central screw, wherein

Either the trigger wheel is rotatable relative to the output element and / or relative to the camshaft and

· Fixing the adjusted angular position and tightening the central screw, whereby the trigger wheel, the output element and the camshaft are connected to each other in a rotationally fixed manner.

The inventive arrangement is a reliable assembly between see the trigger and the output element on the one hand and the camshaft adjuster with the trigger and the camshaft on the other hand achieved.

Brief Description of the Drawings Embodiments of the invention are illustrated in the figures. Show it:

1 shows a section through a camshaft adjuster according to the invention,

Fig. 2 is a perspective view of the trigger wheel with the wire of FIG. 1 and

Fig. 3 is a perspective view of the camshaft adjuster of FIG. 1 with hidden trigger wheel. Detailed description of the drawings

1 shows a section through a camshaft adjuster 1 according to the invention.

The camshaft adjuster 1 has a drive element 2, an output element 3, a cover element 4 and the trigger wheel 5. With the drive element 2, the lid member 4 rotatably and axially fixed. Within and coaxial with the drive element 2, the output element 3 is arranged. Drive element 2 and output element 3 form in the circumferential direction known from the prior art hydraulic working chambers. The output element 3 is largely prevented by the cover element 4 and a further cover element 10, which is opposite to the cover element 4, in a movement against axial movement, but can rotate or pivot relative to the drive element 2.

The trigger wheel 5 has a hub 1 1, on whose front side the

Output element 3 comes to rest. On the outer circumference of the trigger wheel 5 marks for signal detection are provided. To the hub 1 1 around de wire 6 is arranged, with which the attachment to the driven element 3 is formed.

The cover element 4 is designed as a thin-walled, annular component. The output element 3 has the cover element 4 open, but partially covered by the lid member 4 pockets 8 in the region of its hub. This overlap is formed as an undercut 9. In these pockets 8 engage as hooks 7 formed ends of the wire 6 a. The hooks 7 are formed in this embodiment in such a way that the wire 6 initially extends in the direction of the bottom of the pocket 8, then has a bend and points with the wire end in the direction of the opening of the pocket 8, anchored in particular with the wire end in the undercut 9 is. The pocket 8 thus has at least one end opening and is located between the region of the armature. Chamber of Labor / pressure chambers and a central opening 14 of the driven element 3 for penetrating a central valve for the controlled distribution of the hydraulic medium in the working chambers / pressure chambers arranged. The trigger wheel 5 has at least one radially directed lug 12 in the region of the hub 11. This radial tab 12 fix the wire 6, and possibly formed by this turns, in the axial direction of the trigger wheel 5 and lies with its axial side surface on the front side of the driven element 3 or also covers the axial opening of the pocket eighth

FIG. 2 shows a perspective view of the trigger wheel 5 with the wire 6 from FIG. 1. The trigger wheel 5 is rondenförmig and preferably formed of sheet metal. It has at its outer edge bent tabs as markings, by means of which the angular position can be determined. The centrally extending in the axial direction hub 1 1 has two diametrically opposed tabs arranged 12. The hub 1 1 is of a wire 6, which in each case end forms a hook arranged 7 for locking with the driven element 3, entwined. Thus, there is at least one turn between the two hooks 7.

FIG. 3 shows a perspective view of the camshaft adjuster 1 of FIG. 1 with the trigger wheel 5 hidden. Differing from the embodiment of the wire 6 from the aforementioned figures, the wire 6 is present twice in FIG. 3 and has an arranged hook 7 at each end for locking with the output element 3. Thus, instead of two hooks 7 now four hooks 7 are present, whereby the reliability of the attachment is increased. Each of the two wires 6 has at least half a turn of about 180 °. Now advantageously, the tab 12 is provided several times, at least four times, on the trigger wheel 5 in order to hold the two wires 6 on the trigger wheel 5. To reduce the number of tabs 12, these can be used as snap hooks be formed and to fix the respective wire 6 also in the radial direction.

The unobstructed view of the wire arrangement due to the hidden trigger wheel 5 clearly shows that there is a small distance between the hooks 7 and the wall of the respective pocket 8, which is used for relative rotation in the circumferential direction 13 and thus for adjustability in the assembly becomes. Alternatively, the hooks 7 can contact the wall of the pockets 8 in the circumferential direction 13 - but in this case a relative rotational possibility is provided between the trigger wheel 5 and the wire 6.

For example, the wire 6 can be preassembled with the pockets 8 and the trigger wheel 5 can then be joined to the elastically and resiliently formed wire 6.

Preferably, the spring 5 acting between the drive element 2 and the driven element 3 is also covered by the trigger wheel 5.

Those pockets 8 which are intended for attachment are advantageously arranged opposite one another. Alternatively, three angularly spaced pockets 8 can be used for fastening, wherein advantageously the trigger wheel 5 can be precentered better to the output element 3.

Thus, various combinations of hooks 7 and the pockets required for the engagement 8 are possible to reliably hold the trigger wheel 5 on the driven element 3 and finally by means of a central screw, which may include a Zentralven- til rotatably the driven element 3 with the trigger 5 and to fix the camshaft. List of reference numbers) Camshaft adjuster

) Drive element

) Output element

) Cover element

) Trigger wheel

) Wire

) Hook

) Bag

) Undercut

0) cover element

1) hub

2) tab

3) circumferential direction

4) Central opening

5) spring

Claims

claims

1 . Camshaft adjuster (1) with a drive element (2), a

Output element (3) and a cover element (4), wherein with the

Output element (3) a trigger wheel (5) is fixed, characterized in that the trigger wheel (5) has a wire (6) which forms at least one hook (7), which in a pocket (8) of the

Output elements (3) engages.

2. camshaft adjuster (1) according to claim 1, characterized in that the hook (7) is designed as a barb and with a

Undercut (9) latched, which is formed by an overlap of the lid member (4) with the pocket (8).

3. camshaft adjuster (1) according to claim 1 or 2, characterized in that the wire (6) has at least one turn, wherein by the radial bias of the winding of this wire (6) with a hub (1 1) of the trigger wheel (5) is secured captive.

4. camshaft adjuster (1) according to any one of the preceding claims, characterized in that the trigger wheel (5) has at least one tab (12) which fixes the wire (6) with the trigger wheel (5).

5. camshaft adjuster (1) according to claim 1, characterized in that the pocket (8) permits a rotatability in the circumferential direction (13) between the trigger wheel (5) and the output element (3).

6. camshaft adjuster (1) according to claim 1, characterized in that the wall (14) of the trigger wheel (5) has an opening which is penetrated by the wire (6).

7. camshaft adjusting device with a camshaft adjuster (1) according to one of the preceding claims, characterized in that the camshaft adjustment device has a camshaft, the hub (11) of the trigger wheel (5) being penetrated by a central screw which engages in the camshaft, the

Output element (3), the camshaft and the trigger wheel (5) rotatably clamped to each other by the central screw.

Method for assembling a camshaft adjuster (1), which has a drive element (2), an output element (3) and a cover element (4), wherein with the output element (3) a trigger wheel (5) can be fastened, characterized in that

The trigger wheel (5) is in the form of a preassembled structural unit with a wire (6) having a hook (7),

This unit is fed in the axial direction to the camshaft adjuster (1),

• the hook (7) passes through the cover element (4) and

• immersed in a pocket (8) of the driven element (3).

Method for assembling a camshaft adjusting device with a camshaft adjuster (1), which has a drive element (2)

Output element (3) and a cover element (4), wherein with the cover element (4) a trigger wheel (5) can be fastened, as well as with a camshaft, characterized in that

This unit is fed in the axial direction to the camshaft adjuster (1),

• the hook (7) passes through the cover element (4) and

• immersed in a pocket (8) of the driven element (3),

The camshaft adjuster with the mounted assembly is fed to the camshaft,

• a central screw penetrates the camshaft adjuster (1) and engages in the camshaft, • Before tightening the central screw, a rotation of the trigger wheel (5) takes place relative to the output element (3) or to the camshaft for setting an angular position between the trigger wheel (5) and camshaft,

• Fixing the adjusted angular position and tightening the central screw, whereby the trigger wheel (5), the output element (3) and the camshaft are connected in a non-rotatable manner. Method for mounting a camshaft adjusting device with a camshaft adjuster (1) according to one of claims 1 to 6 and with a camshaft, characterized in that

• the camshaft adjuster (1) is fed to the camshaft trigger wheel (5) already mounted with the camshaft adjuster (1),

• a central screw penetrates the camshaft adjuster (1) and the trigger wheel (5) and engages in the camshaft,

• Before tightening the central screw, a rotation of the trigger wheel (5) relative to the output element (3) or the camshaft for adjusting an angular position between the trigger wheel (5) and camshaft takes place,

Either the trigger wheel (5) relative to the output element (3)

and / or rotatable relative to the camshaft,

• Fixing the adjusted angular position and tightening the central screw, whereby the trigger wheel (5), the output element (3) and the camshaft are connected in a non-rotatable manner.