Deep rolling machine for crankshafts

Abstract

The invention regards a deep rolling machine (2) for crankshafts (5) with several deep rolling units (3) in a scissor-type configuration that are attached to the deep rolling machine (2) in the direction of the axis of rotation (4) of the crankshaft (5) with respective lateral distances (6) one besides another in a way that they can swivel thanks to the fact that some deep rolling devices (3) are intended for the deep rolling of main bearing journals (14) and other deep rolling units (3) are intended for the deep rolling of the pin bearing journals of the crankshaft (5) and that the deep rolling units (3) carry at the outer ends of their two scissor-type arms respectively one deep roller head (11) and a supporting roller head (9) that, together, form a deep rolling tool (3) where the deep rolling tool (10) along the scissor-type arms has a distance from the fastening point of the deep rolling unit (3) to the deep rolling machine (2) that is long when compared to the ratio between the width (7) of the scissor-type arms and their length. At least one of the deep rolling units (3) intended for the deep rolling of the main bearing journals (14) or of the pin bearing journals features a device (8) that enters into contact with the crankshaft (5) when the deep rolling unit (3) is in its working position, and that stabilises the deep rolling unit (3) in the direction of the axis of rotation (4) of the crankshaft (5).

Description

The invention will now be specified in greater detail by describing an embodiment thereof. It shows:

FIG. 1 with a deep rolling machine in a perspective view and

FIG. 2 with a deep rolling tool in a lateral view, and

FIG. 3 with a section across the deep rolling tool from FIG. 2 along the line III-III.

On a crossbeam 1 of the deep rolling machine 2, there are several deep rolling units 3 arranged side by side. The deep rolling units 3 are designed as of the scissor-type and are attached to the crossbeam 1 along the axis of rotation 4 of a crankshaft 5 clamped in the deep rolling machine 2 and have the mutual distance 6. The deep rolling units 3 have respectively a width of 7 that is small when compared to their length. The result is that the deep rolling units 3 have a low bending resistance in the direction of the axis of rotation 4. This low bending resistance results in the potential that during the deep rolling of the crankshaft 5, vibrations can result in the deep rolling machine 2 that point in the axial direction 4 and can affect all deep rolling units 3.

To prevent such vibrations, an axial roller 8 is provided that is pivoted on the supporting roller head 9 of the deep rolling tool 10. If the deep rolling tool 10 which comprises the deep rolling head 11 and the supporting roller head 9 as shown in FIG. 2 is closed, the axial guide roller 8 enters into contact with the relative oil collars 12 and 13 of a bearing pin 14 of the crankshaft 5. With this intervention, the axial guide roller 8 stabilises the appertaining deep rolling unit 3 in the axial direction 4 and transmits the forces that may occur on the deep rolling unit 3 between the fixation on the crossbeam 1 and the deep rolling tool 10, at the exterior end of the scissor-type arms of the deep rolling unit 3 to the crankshaft 5 and in this way, it stabilises the appertaining deep rolling unit 3. Such forces can arise due to vibrations that form in axial direction on one of the deep rolling units 2 due to different forces.

It is sufficient to stabilise single deep rolling units 3 of a deep rolling machine 2 in the direction of the axis of rotation 4. This can for example be done by means of one or several deep rolling units 10 that attack the main bearing journals 14 of the crankshaft 5 or one or several deep rolling tools 10 that attack the pin bearing journals of the crankshaft 5. However, it has been widely adopted to equip all deep rolling units 3 on a deep rolling machine 2 with devices that stabilise the deep rolling units 3 in axial direction 4.

The other configuration in the context of the present invention is not shown here graphically where stabilising devices can be mounted between individual deep rolling units 3 at a mutual distance 6. These may be spacer pieces or distance holders that attack a bearing journal 14 on a crankshaft 5 from a point of the scissor-type arms of the deep rolling unit 3. Preferred locations for the installation of such stabilisers are for example hinge points on the scissors arms of the deep rolling units 3.

LIST OF REFERENCE MARKS

• 1 Crossbeam
• 2 Deep rolling machine
• 3 Deep rolling unit
• 4 Axis of rotation
• 5 Crankshaft
• 6 Mutual distance
• 7 Width
• 8 Axial guide roller
• 9 Supporting roller head
• 10 Deep rolling tool
• 11 Deep rolling head
• 12 Oil collar
• 13 Oil collar
• 14 Main bearing journal

Claims

1. Deep rolling machine (2) for crankshafts (5) with several deep rolling units (3) in a scissor-type configuration which are with lateral distances (6) one next to another hinged to the deep rolling machine (2) in the direction of the axis of rotation (4) of the crankshaft (5), so that some deep rolling units (3) are provided for the deep rolling of the main bearing journals (14) and other deep rolling units (3) for the deep rolling of the pin bearing journals of the crankshaft (5) and the deep rolling units (3) at the outer ends of their two scissor-type arms carry a deep rolling head (11) and a supporting roller head (9) respectively that form together a deep rolling tool (10) where the deep rolling tool (10) along the scissor-type arms of the appertaining fastening of the deep rolling unit (3) to the deep rolling machine (2) has a large distance when compared to the ratio of length and width (7) of the scissors arm, wherein at least one of the deep rolling units (3) intended for the deep rolling of the main bearing journals (14) or of the pin bearing journals features a device that attacks the crankshaft (5) when the deep rolling unit (3) is in its working position and that stabilises the deep rolling unit (3) in the direction of the axis of rotation (4) of the crankshaft (5).

2. Deep rolling machine according to claim 1, wherein the device for stabilising the deep rolling unit is located on the deep rolling tool (10).

3. Deep rolling machine according to claim 2, wherein the device for stabilising the deep rolling unit (3) is located on the deep rolling head (11) of the deep rolling tool (10).

4. Deep rolling machine according to claim 3, wherein the device for stabilising the deep rolling unit (3) is located on the supporting roller head (9).

5. Deep rolling machine according to the claims 2, wherein the device for stabilising the deep rolling unit (3) is designed as an axial guide roller (8) that acts on the oil collars (12, 13) of a main bearing journal (14) or of a pin bearing journal of the crankshaft (5).

6. Deep rolling machine according to the claims 2, wherein the device for stabilising the deep rolling unit (3) is shaped as a prismatic slide block that acts between the appertaining oil collars (12, 13) of a main bearing journal (14) or of a pin bearing journal of the crankshaft (5) when the deep rolling unit (3) is in working position.

7. Deep rolling machine according to the claim 1, wherein the device for stabilising the deep rolling unit (3) is arranged along the scissor-type arms of the deep rolling unit (3).

8. Deep rolling machine according to claim 6, wherein the device for stabilising the deep rolling units is located on a pivot of the deep rolling unit (3).

9. Deep rolling machine according to one of claims 6, wherein the device for stabilising the deep roller unit (3) is designed as distance holder or spacer piece.