Kit for Rammers with Different Drive Types

Abstract

A rammer kit for soil compaction rammers with different drive types includes a crankcase for receiving a crank driving mechanism for converting a rotary drive motion generated by a drive into an oscillating translational motion. The crankcase has a connection opening to which a drive cover can be connected. The drive is attached to the drive cover. Different drive covers are provided as part of the kit for drives of different drive types, while the crankcase is identical for drives of different drive types.

Claims

1. A rammer kit for soil compaction rammers with different drive types, comprising: a crankcase for receiving a crank driving mechanism for converting a rotary drive motion generated by a drive into an oscillating translational motion; wherein the crankcase has a connection opening to which a drive cover can be connected; the drive is attached to the drive cover; and wherein different drive covers are provided as part of the kit for drives of different drive types, while the crankcase is identical for drives of different drive types.

2. Then rammer kit according to claim 1, wherein the rammer has an upper mass and a lower mass which can be moved relative to the upper mass; the lower mass has a ramming foot with a ground contact plate for soil compaction; the crankcase is part of the upper mass; and wherein the crank driving mechanism is designed to move the ramming foot back and forth.

3. The rammer kit according to claim 1, wherein the drive cover is completely pre-assemblable such that the drive is completely set up on the drive cover before the drive cover is placed on the crankcase.

4. The rammer kit according to claim 1, wherein the drive types are selected from the group consisting of: an internal combustion engine; an electric motor in which a drive torque of the electric motor is transmitted to the crank drive mechanism via a gear mechanism; an electric motor that is designed as a direct drive, with a rotor and a stator, wherein the rotor is formed on a motor shaft, which transmits the drive torque directly to the crank driving mechanism, without a further gear mechanism in between; an electric motor that is formed as a segmented motor, with a rotor and a stator surrounding the rotor over a segment of a circle with an angle of less than 360 degrees.

5. The rammer kit according to claim 1, wherein a connection flange is provided at a connection opening of the crankcase; each of the respective different drive covers has a connection flange adapted to be connected to the connection flange of the crankcase; and wherein the connection flanges of the different drive covers are identical to one another.

6. The rammer kit according to claim 1, wherein the drive that is respectively assigned to each drive cover is attached directly on one side of the drive cover.

7. The rammer kit according to claim 1, wherein the crank driving mechanism has a crank pin rotationally driven by the drive.

8. The rammer kit according to claim 1, wherein the drive has an electric segmented motor; and wherein the segmented motor has a rotor and a segmented stator which encloses the rotor not over the entire circumference but only over a segment of a circle.

9. The rammer kit according to claim 8, wherein a bearing pin is provided on an inner side of the drive cover for rotatably supporting the rotor; and wherein the segmented stator is held on the inner side of the drive cover.

10. The rammer kit according to claim 8, wherein at least two grooved recesses are formed on the inner side of the drive cover; the segmented stator, seen in a circumferential direction thereof, has two end-face ends; a cam, which can be pushed into the respectively assigned grooved recess, is respectively formed at the two end-face ends of the segmented stator; respective pairings, each comprising a cam and a grooved recess at the two end-face ends of the segmented stator, form stator brackets which are arranged in the circumferential direction of the segmented stator.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0040] These and other advantages and features of the invention are explained in more detail below on the basis of examples with the help of the accompanying figures, in which:

[0041] FIG. 1 shows in a schematic perspective view an example of a soil compaction rammer according to the invention;

[0042] FIG. 2 shows in a schematic representation different variants of rammers with different drive types;

[0043] FIG. 3 shows some of the variants of FIG. 2 in a more detailed representation; and

[0044] FIG. 4 shows an example of a drive cover for a segmented motor, with a pre-assembled segmented stator.

DETAILED DESCRIPTION

[0045] FIG. 1 shows an example of a rammer according to the invention.

[0046] The rammer has an upper mass 1 and a lower mass 2, which can be moved relative to the upper mass 1. A guiding bar is mounted on the upper mass 1 as a guiding handle 3 for an operator. For the connection and vibration decoupling between the upper mass 1 and the guiding handle 3, vibration decoupling elements in the form of rubber buffers 4 are arranged in a manner known per se.

[0047] A component part of the upper mass 1 is also a drive motor 5, which may be designed as an internal combustion engine or an electric motor, as will be explained in detail later.

[0048] In the example shown in FIG. 1, the drive motor 5 rotationally drives a crank disk 7 via a gear mechanism 6, which may for example have a pinion. The crank disk 7 accordingly bears an external toothing. Coupled to the crank disk 7 via a crank pin 9 is a connecting rod 8, whereby a crank-swivel joint is formed.

[0049] The crank driving mechanism formed by the crank disk 7 and the crank pin 9 is housed in a crankcase 10. An outer guide tube 11 extends on its underside.

[0050] The lower mass has a ramming foot 12 with a ground contact plate 13 and an inner guide tube 14 extending upward from the ground contact plate 13. The inner guide tube 14 of the lower mass 2 can be moved axially back and forth in the outer guide tube 11 of the upper mass 1.

[0051] The crankcase 10 is connected to the ramming foot 12 via a bellows 15 in order to protect the components provided there from dirt, dust and moisture.

[0052] Arranged inside the inner guide tube 14 is a piston 16, which is movably connected to the connecting rod 8 via a rotary joint 17.

[0053] Respectively arranged above and below the piston 16 is a spring assembly, specifically an upper spring assembly 18 and a lower spring assembly 19. The two spring assemblies 18, 19 are thus connected to the piston 16 with one side of the respective springs. With the other, opposite side, each spring assembly 18, 19 lies against an end-side end of the inner guide tube 14. In this way, the movement of the piston 16 enforced by the movement of the connecting rod 8 can be transmitted vibratingly via the two spring assemblies 18, 19 to the ramming foot 12 in a manner known per se.

[0054] The setup of such a rammer is known to this extent.

[0055] It can be used uniformly for rammers with different drive types. It is thus possible to use motors of different types of design for the drive motor 5, as will be explained later on the basis of FIGS. 2 to 4.

[0056] The drive motor 5 is supported by a drive cover 20, on which in the example shown the gear mechanism 6 and the crank disk 7 with the crank pin 9 are also attached or rotatably mounted. In an assembled form, the drive cover 20 forms part of the crankcase 10 and closes a rear connection opening of the crankcase 10.

[0057] FIG. 2 shows examples of rammers with different drive types in a schematic representation.

[0058] Variant A relates to a so-called direct drive, in which the drive motor 5 is attached to the drive cover 20 on the inner side, so that all components of the drive motor 5 are arranged inside the crankcase 10. The direct drive may be advantageously formed by a segmented motor, which is further explained later on the basis of FIGS. 3 and 4.

[0059] In variant B, the drive motor 5 is designed as an interior electric motor that drives the gear mechanism 6.

[0060] In variant C, the drive motor 5 is implemented as an exterior electric motor and drives the gear mechanism 6.

[0061] Variant D shows a two-stroke petrol engine with an exterior internal combustion engine as the drive motor 5, which drives the interior gear mechanism 6.

[0062] In variant E, a four-stroke engine is provided as the drive motor 5, in variant F a diesel engine.

[0063] In FIG. 3, the variants of FIG. 2 are shown in more detail.

[0064] Variant A of FIG. 2 corresponds to variant A of FIG. 3. Schematically shown here is the drive cover 20, which has a segmented stator 21 on its inner side and a rotor 22 rotatably mounted on the drive cover 20. The segmented stator 21 only encloses the rotor over a specific segment of a circle of for example 100 or 90. This is sufficient to drive the rotor 22 rotationally. Formed on the end face of the rotor 22 is the crank pin 9, so that the rotor 22 and the crank pin 9 together form a crank disk 7.

[0065] An example of the segmented motor will be further explained later on the basis of FIG. 4.

[0066] Variant B of FIG. 3 corresponds to variant B of FIG. 2. Accordingly, mounted as an electric motor on the inner side of the drive cover 20 is the drive motor 5, which rotationally drives a gear wheel 24 via a pinion 23 (schematically shown only as a black line). The pinion 23 and the gear wheel 24 form the gear mechanism 6. Attached to the gear wheel 24 is the crank pin 9.

[0067] Variant C of FIGS. 2 and 3 are also identical. The drive motor 5 is mounted here as an exterior electric motor. A motor shaft, not shown, of the drive motor 5 leads to a clutch bell 25, which, depending on the speed, permits or interrupts a torque flow to the pinion 23. In particular at higher motor speeds, the clutch bell 25 closes, so that the pinion 23 is rotationally driven.

[0068] In variant D, the drive motor 5 is mounted on the drive cover 20 as an exterior internal combustion engine.

[0069] In the examples shown, the complete drives, i.e. not only the drive motor 5 but also the gear mechanism 6 and possibly the clutch bell 25, are held on the drive cover 20 and are supported by it. The units shown in each case can in this way be easily pre-assembled and can be completely inserted as a whole into the crankcase 10 and attached to it.

[0070] FIG. 4 shows an example of an embodiment of the drive cover 20 for a segmented motor.

[0071] The drive cover 20 has a connection flange 26, with corresponding bores 27, in which bolts for attaching the drive cover 20 to the crankcase 10 can be inserted. In addition, the connection flange 26 may bear a seal that is not shown.

[0072] Attached on the inner side of the drive cover 20 is a bearing pin 28, on which a rotor, not shown, and possibly suitable bearing elements can be pushed. The rotor corresponds to an example of the rotor 22 shown in FIG. 3, Variant A. The bearing pin 28 may be formed in one piece with the drive cover 20. For example, the drive cover 20 may be produced together with the bearing pin 28 as a cast part. The rotor is rotatably mounted on the bearing pin 28.

[0073] Also attached on the inner side of the drive cover is a segmented stator 29, which corresponds to an example of the stator 21 shown in FIG. 3, variant A. The segmented stator 29 extends only over a certain segment of a circle, in the example shown in FIG. 4 over an angle of approx. 90. The segmented stator 29 is bolted to the drive cover 20. At end-face ends 30 of the segmented stator 29, a cam 31 which can be pushed into a corresponding groove 32 is respectively provided on both sides. The two grooves 32 are part of the drive cover 20.

[0074] This allows the segmented stator 29 to be stably held on the drive cover 20 with interlocking engagement. The two cams 31 and the two assigned grooves 32 together respectively form a stator bracket, which supports the segmented stator 29 well in the direction of the drive torque.

[0075] The bolt pattern of the connection flange 26 predetermined by the bores 27 and their position can be identical for all variants of the drive cover 20, regardless of the drive type set up in each case. The further design of the drive cover 20 is then variable and dependent on the drive type that is to be supported by the drive cover 20.