Compressor with adaptable transmission with respect to the motive source

Abstract

A compressor has a crankcase in which a crankshaft is rotatably mounted in a crankspace. The crankcase contains at least one cylinder space in which a piston, mounted eccentrically on the crankshaft by way of a connecting rod, can be driven in reciprocating motion. The crankshaft is connected, via a gearing having a modulus m, to a drive source, wherein the gear wheel arranged on the crankshaft engages with the gear wheel on the drive source. The axis of rotation of the crankshaft is offset with respect to the center axis of the cylinder space by an amount dl which is a whole multiple of m/2. The center axis of the cylinder space is understood as the axis which proceeds from the center point of the base area of the cylinder space, perpendicular to this base area, and along which the piston moves. This makes it possible to change the transmission ratio of the gearing within an advantageous range, without it being necessary to undertake modifications to the external dimensions of the compressor or to the motive source. Depending on the transmission ratio, it is possible to reduce the operating noise of the compressor or to increase the air capacity.

Claims

1. A compressor, comprising: a crankcase; a crankshaft mounted rotatably in a crank chamber of the crankcase, the crankcase containing at least one cylinder space, in which a piston which is mounted eccentrically on the crankshaft by way of a connecting rod performs a reciprocating movement; a gearwheel mechanism by which the crankshaft is connectable to a drive source, the gearwheel mechanism having a modulus m, wherein the gearwheel which is arranged on the crankshaft engages into the gearwheel of the drive source, and a rotational axis of the crankshaft is offset with respect to a center axis of the cylinder space by a value dl which is an integral multiple of m/2 or which differs from the integral multiple of m/2 only to such an extent that the gearwheel which is arranged on the crankshaft can still engage, without changes to a size of teeth of the gearwheel which is arranged on the crankshaft, into the gearwheel of the drive source for a purpose of a transmission of power, within mechanical tolerances.

2. The compressor as claimed in claim 1, wherein the gearwheel mechanism has a transmission ratio between 1:0.9 and 1:1.1 from the drive source to the crankshaft.

3. The compressor as claimed in claim 2, wherein the transmission ratio is greater than 1.

4. The compressor as claimed in claim 1, wherein a transmission ratio of the gearwheel mechanism is greater than 1.

5. The compressor as claimed in claim 1, wherein the connecting rod eye of the connecting rod, which connecting rod eye is mounted rotatably with respect to the crankshaft, is movable freely in a circle about the axis of the crankshaft.

6. The compressor as claimed in claim 2, wherein the connecting rod eye of the connecting rod, which connecting rod eye is mounted rotatably with respect to the crankshaft, is movable freely in a circle about the axis of the crankshaft.

7. The compressor as claimed in claim 1, wherein the rotational axis of the crankshaft is offset with respect to the center axis of the cylinder space by a value dl of between 1 and 5 mm.

8. The compressor as claimed in claim 7, wherein the value dl is between 2 and 3 mm.

9. The compressor as claimed in claim 2, wherein the rotational axis of the crankshaft is offset with respect to the center axis of the cylinder space by a value dl of between 1 and 5 mm.

10. The compressor as claimed in claim 4, wherein the rotational axis of the crankshaft is offset with respect to the center axis of the cylinder space by a value dl of between 1 and 5 mm.

11. The compressor as claimed in claim 5, wherein the rotational axis of the crankshaft is offset with respect to the center axis of the cylinder space by a value dl of between 1 and 5 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following text, the subject matter of the invention will be explained using figures, without the subject matter of the invention being restricted as a result.

(2) FIG. 1 shows an outline sketch of the compressor according to the invention with an offset between the crankshaft and the center axis of the cylinder space.

(3) FIG. 2 shows the integration of a compressor according to the invention into a predefined engine compartment.

DETAILED DESCRIPTION OF THE DRAWINGS

(4) FIG. 1 shows an outline sketch of a compressor according to the invention. A cylinder bore 1a is situated in the crankcase 1, 5. The center axis of said cylinder bore 1a is denoted by X. A piston 2 moves in the cylinder bore. Said piston 2 is connected to the crankshaft 4 via a connecting rod 3. The connecting rod has two connecting rod eyes 3a and 3b. The upper connecting rod eye 3a is mounted rotatably with respect to the piston 2. The lower connecting rod eye 3b is mounted rotatably with respect to a crankpin 4a which rotates with the crankshaft 4 about its center axis Y. When the crankshaft 4 rotates, the lower connecting rod eye 3b of the connecting rod 3 describes a circle about the center axis Y of the crankshaft 4. The axes X and Y run perpendicularly with respect to one another, the axis X runs in the plane of the drawing, and the axis Y runs perpendicularly with respect to the plane of the drawing. Both axes are displaced with respect to one another in parallel by a value dl, however. The crankshaft 4 is mounted rotatably with respect to the part 5 of the crankcase 1, 5.

(5) The effect of the parallel displacement dl is shown in the case of the integration of the compressor into an engine compartment in accordance with FIG. 2. The engine block 9 is situated with fixed dimensions at a predefined location, which engine block 9 provides a predefined gearwheel 8 for the drive of the compressor. The gearwheel rotates about an axis Z which lies perpendicularly on the plane of the drawing and is at a spacing A from the center axis X of the cylinder space, which center axis X runs in the plane of the drawing. The crankshaft 4 is driven by a gearwheel 7 which engages into the gearwheel 8 on the engine block 9. Said gearwheel 7 rotates about the axis Y which is the axis of symmetry of the crankshaft 4 and lies perpendicularly on the plane of the drawing. The axes Y and Z are at a spacing B from one another which is smaller than the spacing A. Therefore, the gearwheel 7 has a number Z2 of teeth which is smaller than the tooth number Z1 of the gearwheel 8 on the engine block 9. The gearwheel 7 therefore rotates more rapidly than the gearwheel 8. As a result, the compressor ejects a greater air volume per unit time. This change has been brought about without it being necessary to have made a change to the dimensions and form factor of the compressor. The flange 6, by way of which said compressor is mounted in the engine compartment, is also situated at the same location as in the case of a compressor in accordance with the prior art, the gearwheel 7 of which was exactly as large as the gearwheel 8.