阅读说明：本技术 凸轮轴调节器和凸轮轴调节器装置 (Camshaft adjuster and camshaft adjuster arrangement ) 是由 于尔根·韦伯 赖纳·奥特斯巴赫 恩诺·施米特 于 2021-05-26 设计创作，主要内容包括：本发明涉及一种用于调节凸轮轴(2)的相位的凸轮轴调节器(1),具有设计成相对于凸轮轴调节器(1)的驱动元件(4)旋转的从动元件(3)以及轴状构成的、准备用于将从动元件(3)抗扭地与凸轮轴(2)连接的从动锚固件(5),其中从动元件(3)和从动锚固件(5)经由连接部(6)彼此连接,所述连接部(6)具有至少一个具有较高表面粗糙度的第一部段(7)和至少一个具有较低表面粗糙度的第二部段(8),所述第一部段和第二部段在环周方向上彼此邻接。此外,本发明涉及一种具有凸轮轴调节器(1)和凸轮轴(2)的凸轮轴调节器装置,所述凸轮轴通过表面结构化的压配合部(14)与从动锚固件(5)抗扭地连接。(The invention relates to a camshaft adjuster (1) for adjusting the phase of a camshaft (2), having a driven element (3) which is designed to rotate relative to a drive element (4) of the camshaft adjuster (1), and having a shaft-like driven anchor (5) which is intended for the rotationally fixed connection of the driven element (3) to the camshaft (2), wherein the driven element (3) and the driven anchor (5) are connected to one another via a connection (6), wherein the connection (6) has at least one first section (7) having a high surface roughness and at least one second section (8) having a low surface roughness, wherein the first and second sections adjoin one another in the circumferential direction. The invention further relates to a camshaft adjuster device having a camshaft adjuster (1) and a camshaft (2) which is connected in a rotationally fixed manner to a driven anchor (5) by means of a surface-structured press fit (14).)

1. A camshaft adjuster (1) for adjusting the phase of a camshaft (2) relative to a crankshaft in a motor vehicle drive train, the camshaft adjuster (1) having: a driven element (3) designed to rotate within a limited angular range with respect to a driving element (4) of the camshaft adjuster (1); and a driven anchor (5) of shaft-like design, which is intended for rotationally fixedly connecting the driven element (3) to the camshaft (2), wherein the driven element (3) and the driven anchor (5) are connected to one another via a non-positively and/or materially bonded connection (6), characterized in that the connection (6) has at least one first section (7) having a high surface roughness and at least one second section (8) having a low surface roughness, which adjoin one another in the circumferential direction.

2. Camshaft adjuster (1) according to claim 1, characterized in that the connecting portion (6) has a plurality of first sections (7) with a high surface roughness and a plurality of second sections (8) with a low surface roughness alternating in the circumferential direction.

3. Camshaft adjuster (1) according to claim 2, characterized in that the first section (7) is formed by a surface structure which is interrupted in the circumferential direction.

4. Camshaft adjuster (1) according to claim 2 or 3, characterized in that the second section (8) is configured as a radial bearing surface for the centered support of the driven anchor (5) on the driven element (3).

5. Camshaft adjuster (1) according to one of claims 1 to 4, characterized in that the camshaft adjuster (1) is designed as a vane-type camshaft adjuster and in the driven element (3) and/or in the driven anchor (5) there is a hydraulic channel (11) for adjusting the driven element (3) relative to the drive element (4), wherein the hydraulic channel (11) is arranged in the region of the second section (8) of the connection (6).

6. Camshaft adjuster (1) according to one of claims 1 to 5, characterized in that the contact surface (9) of the driven element (3) has a smaller inner diameter in the region of the second section (8) than in the region of the first section (7).

7. Camshaft adjuster (1) according to one of claims 1 to 6, characterized in that the contact surface (10) of the driven anchor (5) has a larger outer diameter in the region of the second section (8) than in the region of the first section (7).

8. Camshaft adjuster (1) according to one of claims 1 to 7, characterized in that the follower anchor (5) has a radially outwardly projecting flange (12) in the axial end region of the follower anchor (5), which flange adjoins the first section (7) in the axial direction.

9. Camshaft adjuster (1) according to one of claims 1 to 8, characterized in that the camshaft adjuster (1) has a drive element (4), which drive element (4) is arranged concentrically to the driven element (3) and radially outside the driven element (3), wherein the driven element (3) is rotatably supported relative to the drive element (4) within a limited angular range.

10. Camshaft adjuster device with a camshaft adjuster (1) according to one of claims 1 to 9 and a camshaft (2) which is connected rotationally fixed to the driven anchor (5) by means of a surface-structured press fit (14).

Technical Field

The invention relates to a camshaft adjuster for adjusting the phase position of a camshaft relative to a crankshaft in a motor vehicle drive train. The invention further relates to a camshaft adjuster device having a camshaft adjuster and a camshaft connected thereto.

Background

Camshaft adjusters are known from the prior art. For example, DE 102004026863 a1 discloses a camshaft adjuster for adjusting and fixing the phase position of a camshaft relative to its crankshaft of an internal combustion engine, having: a drive wheel driven by the crankshaft; a driven part fixed to the camshaft, which is arranged on the camshaft or on the camshaft extension and is driven by the drive wheel, wherein the phase position of the driven part relative to the drive wheel can be adjusted within a certain angular range, wherein the driven part is fastened in a force-fitting manner on the camshaft or on the camshaft extension.

However, the prior art always has the following disadvantages: camshaft adjusters, in particular the connection between the camshaft adjuster and the camshaft, are complicated and costly to produce.

Disclosure of Invention

It is therefore an object of the present invention to avoid or at least mitigate the disadvantages of the prior art. In particular, a camshaft adjuster is to be provided which is made of simple components, so that the camshaft adjuster can be produced with little production effort and at low cost.

This object is achieved by a camshaft adjuster according to the invention. Advantageous improvements are described herein.

In particular, the invention is achieved by a camshaft adjuster for adjusting the phase position of a camshaft relative to a crankshaft in a motor vehicle drive train. The camshaft adjuster has a driven element which is designed to rotate within a limited angular range relative to a drive element of the camshaft adjuster. The camshaft adjuster has a shaft-like output anchor which is intended for the rotationally fixed connection of the output element to the camshaft. The driven element and the driven anchor are connected to one another via a force-fitting and/or material-fitting connection, in particular by a (longitudinal) press fit. The connection has at least one first section with a higher surface roughness and at least one second section with a lower surface roughness (i.e. the second section has a lower surface roughness than the first section), which adjoin one another in the circumferential direction. In other words, the connection has a surface structure which is (only) formed in sections in the circumferential direction. By targeted setting of the surface roughness, the connection can be locally strengthened, but at the same time disadvantages (e.g. stresses or chips formed during joining) due to the provision of a higher surface roughness can be locally avoided.

The driven element can preferably be designed as a sintered component, for example, made of sintered metal. The driven anchor can preferably be configured as a rotating component, for example made of low alloy steel. In this way, low-cost manufacturing can be ensured.

According to a preferred embodiment, the connection can have a plurality of first sections with a high surface roughness and a plurality of second sections with a low surface roughness alternating in the circumferential direction. The force-fit (press-fit) connection is locally reinforced by the first section. At the same time, the deformation during the joining/pressing-in process is minimized or compensated by the second section or is fixed to a specific region, i.e. the first section. In other words, the connection in the circumferential direction is configured with a high surface roughness in sections and a low surface roughness in sections.

According to a preferred embodiment, the first section may be formed by a surface structure (or surface profile) that is interrupted in the circumferential direction. Surface structures are understood to be, for example, knurling or laser structuring. The contact surface of the components to be connected to one another is increased by the surface structure, so that the connection has a higher strength.

The camshaft adjuster can be designed in particular as a vane-type camshaft adjuster. The camshaft adjuster has a hydraulic channel in the output element and/or the output anchor for adjusting the output element relative to the drive element. According to a preferred embodiment, the hydraulic channel may be provided in a second section (or second sections) of the connection. Thereby avoiding that swarf may enter the hydraulic channel when the first section is engaged.

Alternatively, the camshaft adjuster can also be designed as an electric camshaft adjuster. I.e. the surface structure at the connection between the driven element and the driven anchor, can be made independent of the manner of adjustment.

According to an advantageous development, the second portion can be designed as a radial bearing surface for the centered support of the driven anchor on the driven element. This ensures a centered support of the two components to be connected. I.e. deformation upon engagement/pressing-in of the knurling/surface structure has no effect on the radial support.

It is also advantageous if the contact surface of the driven element has a smaller inner diameter in the region of a second section (or second sections) than in the region of a first section (or first sections). This ensures that the second section acts as a radial bearing surface.

It is furthermore expedient for the contact surface of the driven anchor to have a larger outer diameter in the region of a second section (or second sections) than in the region of a first section (or first sections). This ensures that the second section acts as a radial bearing surface.

It is furthermore preferred that the driven anchor has a radially outwardly projecting flange in the axial end region of the driven anchor, which flange adjoins the first section in the axial direction. Thus, an axial stop/axial limitation may be provided for the driven element. Alternatively, the flanges may be replaced by stamping patterns or form-fitting elements, such as snap rings.

According to a further preferred embodiment, the camshaft adjuster can have a drive element which is arranged concentrically with the driven element and radially outside the driven element, wherein the driven element is mounted so as to be rotatable within a limited angular range relative to the drive element.

The object of the invention is also achieved by a camshaft adjuster arrangement having the camshaft adjuster and a camshaft. The camshaft is connected in a rotationally fixed manner to the driven anchor by a surface-structured press fit.

In other words, the invention relates to a low-cost connection of a (electrical or hydraulic) camshaft adjuster to a camshaft. In particular, a combination of an anchor and a hub is provided, which in the known hydraulic camshaft adjusters to date results in complex components which can only be produced by complicated sintering processes or by complicated turning and milling processes. By separating the anchor from the hub, the hub can be designed as a simple sintered component, while the anchor can be designed as a turned part with little cutting effort, as a result of which additional screw elements can be dispensed with and costly welded connections or positive-locking connections with play can be avoided. In particular an oil-conducting anchor, which serves as a connecting element between the driven element (hub) and the camshaft and is connected to the driven element and the camshaft via at least one press fit with or without a surface structure. In order to avoid chips during engagement, the connection between the anchor and the driven element can preferably have a surface structure, for example embossed or laser-structured, on the circumference only outside the radial bores/hydraulic channels. Because the crimp has a recess in the surface structure/knurled area, radial deformation when engaging the knurls does not limit the bearing function. A flange may preferably be provided on the end face for increasing the strength and preventing the driven element from moving axially during engagement. Alternatively, the flange can be replaced by a stamped pattern or form-fitting element, such as a snap ring/Seegering ring (Seegering). The cost efficiency is advantageously improved by the press fit and the press fit is enhanced by the locally applied knurling. For low-cost production, the anchor can be made of, for example, a low-alloy steel, while the driven element can be made of, for example, a sintered metal. The recess of the knurling in the region of the radial bearing section prevents any concentricity errors that may occur during the absorption of deformations.

Drawings

The invention is explained below with the aid of the figures. The figures show:

figure 1 shows a longitudinal section through a camshaft adjuster with a camshaft,

fig. 2 shows a perspective view of the output element of the camshaft adjuster, and

fig. 3 shows a perspective view of the follower anchor of the camshaft adjuster.

The drawings are merely schematic and are provided for understanding the present invention. Like elements are provided with like reference numerals.

Detailed Description

Fig. 1 shows a camshaft adjuster 1 and a representation of its individual components. The camshaft adjuster 1 serves to adjust the phase position of a camshaft 2 relative to a crankshaft (not shown). The camshaft adjuster 1 is used in a motor vehicle drive train of an internal combustion engine. The camshaft adjuster 1 has a driven element 3. The output element 3 is connected or connectable in a rotationally coupled manner to the camshaft 2. The output element 3 is designed/prepared for rotation within a limited angular range (for phase adjustment) relative to the drive element 4 of the camshaft adjuster 1. The driven element 3 is configured as a hub. The drive element 4 is connected or connectable to the crankshaft in a rotationally coupled manner.

The camshaft adjuster 1 has a follower anchor 5. The driven anchor 5 is formed in a shaft-like manner. I.e. the driven anchor 5 is configured as a shaft. The driven anchor 5 is in particular designed as a hollow shaft. The driven anchor 5 is designed/prepared for the rotationally fixed connection of the driven element 3 to the camshaft 2. The follower anchor 5 thus serves as a camshaft connection of the camshaft adjuster 1.

The driven element 3 and the driven anchor 5 are connected to one another by a force-fit and/or material-fit connection 6. In particular, a press fit, in particular a longitudinal press fit, is formed between the driven element 3 and the driven anchor 5. The radially inner peripheral surface of the driven element 3 is connected to the radially outer peripheral surface of the driven anchor 5 via a connecting portion 6.

The connection 6 between the driven element 3 and the driven anchor 5 has at least one first section 7 with a high surface roughness and at least one second section 8 with a low surface roughness, which adjoin one another in the circumferential direction/viewed circumferentially. In this case, the first portion 7 and/or the second portion 8 are formed in a targeted manner on the connection 6, i.e. not accidentally, for example due to machining-induced fluctuations. The connection 6 is formed between a contact surface 9 of the driven element 3 and a contact surface 10 of the driven anchor 5. I.e. the first portion 7 and/or the second portion 8 is/are introduced/machined specifically into the contact surface 9 of the driven element 3 and/or into the contact surface 10 of the driven anchor 5.

The connection 6 has a plurality of first sections 7 with a high surface roughness and a plurality of second sections 8 with a low surface roughness alternating in the circumferential direction. In the embodiment shown, the first portions 7 are formed alternately with the second portions 8 in the contact surface 9 of the driven element 3 and in the contact surface 10 of the driven anchor 5.

In particular, the first section 7 is formed by a surface structure or surface profile which is interrupted in the circumferential direction. In the embodiment shown, the first section 7 is formed by knurling with axially parallel grooves. Alternatively, the first section 7 may be formed, for example, by laser structuring. Since chips are produced on account of the surface structure when joining the first portion 7, the formation of chips in a specific region of the connection 6, i.e. the first portion 7, can be prevented by providing the second portion 8. I.e. the (pinched) connection 6 is only locally reinforced by the surface structure or surface profile.

The second portion 8 is designed as a radial bearing surface for the centered support of the driven anchor 5 on the driven element 3. In particular, the contact surface 9 of the driven element 3 has a smaller inner diameter in the region of the second section 8 than in the region of the first section 7. In particular, the contact surface 10 of the driven anchor 5 has a larger outer diameter in the region of the second section 8 than in the region of the first section 7. Thereby avoiding adversely affecting the bearing function due to radial deformation of the first section 7 upon engagement.

In the embodiment shown, the camshaft adjuster 1 is designed as a vane-type hydraulic camshaft adjuster. The camshaft adjuster 1 has a hydraulic channel 11 for adjusting the output element 3 relative to the drive element 4. The hydraulic channel 11 connects the radially outer side of the driven element 3 with the radially inner space within the driven anchor 5. In the radially inner space a central valve is arranged for controlling the flow of hydraulic medium through the hydraulic channel 11. The hydraulic channel 11 extends in the radial direction through the driven element 3 and/or the driven anchor 5. Hydraulic channels 11 are provided in one or more second sections 8 of the connection 6. I.e. the hydraulic channel 11 opens into the contact surfaces 9, 10 in the region of the second section 8. In other words, the first section 7 is arranged outside (in the circumferential direction) the hydraulic channel 11.

The driven anchor 5 has a flange 12 projecting radially outward. The flange 12 is formed, for example, in a flange-like manner circumferentially. The flange 12 is arranged in the axial end region (facing away from the camshaft) of the driven anchor 5. The flange 12 adjoins the first section 7 in the axial direction, i.e. adjoins the surface structuring. The flange 12 forms an axial stop for the driven element 3. Alternatively, a snap ring may be used to fix the axial position of the driven element 3 relative to the driven anchor 5. The driven element 3 has an axial recess 13 on the end side. The flange 12 abuts against the driven element 3 in the region of the axial recess 13.

The driven anchor 5 is connected to the camshaft 2 via a surface-structured press fit 14. The driven anchor 5 has a surface structure 15 (or surface profile) on its radial outside at its axial end region (facing the camshaft). In the embodiment shown, the surface structure 15 is formed by knurling with axially parallel grooves. The surface structure 15 is formed circumferentially. When the camshaft tube 16 of the camshaft 2 is engaged onto the axial end region of the driven anchor 5, a press fit is formed which is reinforced by the surface structure 15. In the axial region of the press-fit portion 14, a sensor wheel 17 is provided on the radial outside of the camshaft tube 16, which reinforces the press-fit portion 14.

List of reference numerals

1 camshaft adjuster

2 camshaft

3 driven element

4 drive element

5 driven anchor

6 connecting part

7 first section

8 second section

9 contact surface

10 contact surface

11 Hydraulic channel

12 Flange

13 axial recess

14 press fit portion

15 surface structure

16 cam shaft tube

17 sensing wheel