EP1529165B1 - Swash plate pump, especially for high pressure cleaning apparatuses - Google Patents

Description

The invention relates to a swash plate pump, in particular for high-pressure cleaning devices, with at least one voltage applied to a swash plate and during rotation about an axis of rotation reciprocally driven pump piston and the swash plate in a rotating drive, comprising a pinion with a concentric with the axis of rotation of the Swash plate arranged sprocket meshes.

In swash plate pumps, the high speeds of the drive motor used are often reduced via a gear upstream of the swash plate, in addition to parts are needed and in particular additional space that increases the length of a swash plate pump.

In US-A-3,885,444 a swash plate pump is described, in which the swash plate is driven by a pinion, which meshes with a concentric with the axis of rotation of the swash plate arranged sprocket. The sprocket is arranged at an axial distance from the inclined swash plate, so that there is a large height, the swash plate itself is also complicated and correspondingly difficult to manufacture.

It is an object of the invention to form a generic swash plate pump so that a reduction in the speed of the drive motor is possible in a particularly simple manner, in particular, swash plate and pinion should be easy to manufacture.

This object is achieved according to the invention in a swash plate pump of the type described above, that the swash plate has two concentric annular flanges extending parallel to each other, which are connected to each other via an oblique to the rotation axis, annular bottom, and that the sprocket is formed in one of these annular flanges ,

In this way it is possible to realize by the choice of different diameters for the annular flanges and thus for the sprocket and different gear ratios. For example, the sprocket may be molded into the inside of the inner annular flange, but it is also possible to mold the sprocket into the outside of the outer annular flange.

Preferably, the pinion rotates about an axis parallel to the axis of rotation of the swash plate axis, but it can also be provided that the axis of the pinion relative to the axis of rotation is inclined, for example, at an angle in the order of 5 ° to 15 °. In this way you can adjust the overall arrangement optimally to the space available.

The sprocket is preferably arranged in a plane which is perpendicular to the axis of rotation of the swash plate. In principle, it would also be possible to arrange the sprocket in a plane which is inclined relative to the axis of rotation of the swash plate. In particular, it can be provided that the plane of the sprocket runs parallel to the contact surface of the swash plate.

This can be realized, for example, in a ring-shaped swash plate in which the ring gear is formed in the inside of the inner ring flange.

A particularly advantageous embodiment is obtained when the swash plate is deep-drawn. The indentation of the ring gear can already be made in this deep-drawing process, so that no additional processing steps are necessary. The pinion has a circular cylindrical, arranged concentrically to the axis of rotation of the pinion outer surface which carries the teeth of the pinion. These teeth preferably run parallel to the axis of rotation of the pinion.

In a modified embodiment of a swash plate pump can be provided that the pinion and the ring gear are helically toothed.

As a result, a lifting of the swash plate under load is avoided with certainty.

While preferably the sprocket is integrally incorporated in the swash plate, according to a modified embodiment can also be provided that the sprocket and the swash plate made of different materials and are firmly connected. This makes it possible to use for the sprocket under certain circumstances more wear-resistant materials than for the swash plate.

For example, the sprocket may be formed as an insert, which is inserted into the swash plate. The compound can be achieved by molding, by a press fit or similar known joining technique.

Figur 1:

Eine Schnittansicht durch den Taumelscheibenantriebsteil einer Taumelscheibenpumpe mit einer topfförmigen Taumelscheibe und einem im Inneren der Taumelscheibe angeordneten Antriebsritzel;

Figur 2:

eine Ansicht ähnlich Figur 1 mit einer topfförmigen Taumelscheibe und außen liegender Verzahnung;

Figur 3:

eine Ansicht ähnlich Figur 1 mit einer zwei konzentrische Ringflansche aufweisenden Taumelscheibe und einer Innenverzahnung;

Figur 4:

eine Ansicht ähnlich Figur 1 mit einer topfförmigen Taumelscheibe;

Figur 5:

eine Ansicht ähnlich Figur 1 mit einer ringförmigen Taumelscheibe und einem Zahnkranz an der inneren Kante der Taumelscheibe;

Figur 6:

eine Ansicht ähnlich Figur 1 mit einer Taumelscheibe mit hülsenförmiger Wand und innenliegender Verzahnung und

Figur 7:

eine Ansicht ähnlich Figur 1 mit einer gegenüber der Drehachse der Taumelscheibe geneigten Wand der Taumelscheibe und einer gegenüber der Drehachse der Taumelscheibe geneigten Drehachse des Antriebsritzels.

The following description of preferred embodiments of the invention is used in conjunction with the drawings for further explanation. Show it:

FIG. 1:

A sectional view through the swash plate driving part of a swash plate pump with a cup-shaped swash plate and arranged in the interior of the swash plate drive pinion;

FIG. 2:

a view similar to Figure 1 with a cup-shaped swash plate and external toothing;

FIG. 3:

a view similar to Figure 1 with a two concentric annular flanges having swash plate and an internal toothing;

FIG. 4:

a view similar to Figure 1 with a cup-shaped swash plate;

FIG. 5:

a view similar to Figure 1 with an annular swash plate and a ring gear on the inner edge of the swash plate;

FIG. 6:

a view similar to Figure 1 with a swash plate with sleeve-shaped wall and internal teeth and

FIG. 7:

a view similar to Figure 1 with a relative to the axis of rotation of the swash plate inclined wall of the swash plate and a relative to the axis of rotation of the swash plate inclined axis of rotation of the drive pinion.

In the drawing, only the middle part of a swash plate pump is shown, which is arranged between a drive motor, in particular an electric motor, and the actual pump housing. It is the part in which a rotational movement of the drive motor is converted into a reciprocating stroke of at least one pump piston.

This intermediate part is accommodated in a housing 1, which is closed on its underside by a bottom plate 2. On this a cage 3 is arranged, in which spherical bearing body 4 is a swash plate fifth is rotatably mounted. The swash plate of Figure 1 is formed substantially pot-shaped, it has an angle to its axis of rotation extending bottom 6 and an adjoining, circular cylindrical, concentric with the axis of rotation extending side wall 7, the rounded at its free edge 8 contact surfaces 9 for the spherical bearing body having. The swash plate 5 is thus rotatably mounted in the housing 1 about a vertical axis of rotation.

On the outside of the inclined bottom 6 is supported via an intermediate ring 10 with trapped in this spherical bearing bodies 11 from an annular pressure plate 12, abut against the two pistons 13, 14 of the housing 1 on the outside adjoining piston pump. These pistons 13, 14 are longitudinally displaceably guided in a guide 15 at the top of the housing 1 and are pressed by surrounding coil springs 16 via support rings 17 against the pressure plate 12, so that they always rest against this pressure plate and the tumbling rotational movement of the pressure plate alternately pushed out of the housing 1 and pushed back into this.

In the bottom plate 2, a drive shaft 19 is rotatably mounted about a parallel to the axis of rotation of the swash plate 5 extending axis in a ball bearing 18, this drive shaft 19 is driven by an outside of the housing 2 arranged electric motor and projects into the interior of the swash plate 5 in. In this area it carries a drive pinion 20, which meshes with a ring gear 21 which is formed on the inside of the side wall 7 in this. The swash plate 5 is preferably formed as a deep-drawn part, the sprocket 21 can be formed during deep drawing already in the side wall 7.

In the embodiment of Figure 2, a similar arrangement is chosen, it differs from that of Figure 1 only in that the position of the drive shaft, drive pinion and ring gear on the one hand and cage 3 and bearing body 4 on the other are reversed, the drive shaft, the drive pinion and the Sprocket are namely on the outside of the side wall 7, while the pivot bearing of the swash plate 5 is now arranged by the cage 3 with the spherical bearing bodies 4 on the inside of the swash plate 5.

In the embodiment of Figure 3, the swash plate 5 is not cup-shaped, but it has two concentric with each other and concentric to the axis of rotation of the swash plate extending side walls 22, 23 which are interconnected via an inclined annular bottom 24, on which the Pressure plate 12 supported by the bearing in the intermediate ring 10 bearing body 11. Characterized in that here two side walls 22, 23 are provided, there is a greater possibility for the arrangement of the ring gear 21, this ring gear 21 may for example be arranged as shown in Figure 3 on the inside of the inner side wall 22, and accordingly is the drive pinion 20th in the interior of the swash plate. It would also be an arrangement on the outside of the outer side wall 23 is possible and even an arrangement in the space between the two side walls 22 and 23, in which case the ring gear 21 optionally disposed on the outside of the inner side wall 22 or on the inside of the outer side wall 23 could be. The different side walls also make it possible to set the transmission ratio by specific diameters of these side walls.

In the embodiment of Figure 4, the swash plate 5 is cup-shaped and closed at its lower end by an inclined bottom 6, the storage on the bearing body 4 is thus carried out at the top of the swash plate. As in the embodiment of Figure 2, the drive pinion 20 meshes with the ring gear 21 on the outside of the side wall. 7

In the embodiment of Figure 5, the swash plate 5 is annular, the sprocket 21 is incorporated into the inner edge of this annular swash plate 5 and thus extends in the plane of the bottom 6 of this swash plate, ie inclined relative to the axis of rotation of the swash plate 5. The drive pinion 21 is mounted within the annular swash plate 5 and extends over a height which is at least as large as the height differences of the inclined ring gear 21, so that the pinion can mesh in all areas of this ring gear.

In the embodiment of Figure 6 is followed by the annular swash plate 5 down a sleeve-shaped annular flange, in the side wall 7 in a similar manner as in the embodiment of Figures 1 and 2, the ring gear 21 is incorporated, with this meshes the pinion 20, the may be formed internally, as shown in Figure 6, or even outboard, as is the case in the embodiment of Figure 2.

Finally, FIG. 7 shows an arrangement which largely corresponds to that of FIG. In this arrangement, the side wall 7 is not parallel to the axis of rotation of the swash plate, but is slightly conical to the open side expanded, accordingly, the axis of rotation of the pinion 20 is inclined relative to the axis of rotation of the swash plate 5, the inclination may for example be in the order of between 5 ° and 15 °.

An embodiment, as shown in Figure 7, can in principle be used in other embodiments in which the pinion meshes with a side wall of the swash plate, also there pinion and side wall relative to the axis of rotation of the swash plate may be inclined.

In principle, it is provided that the toothing extends parallel to the axes of rotation, but it would also be possible to provide a helical toothing here, thereby preventing lifting of the swash plate from its pivot bearing.

Claims (13)

1. A swash plate pump, particularly for high-pressure cleaning devices, having at least one pump plunger, which abuts against a swash plate (5) and, upon rotation of the swash plate about an axis of rotation, is driven in reciprocating manner, and having a drive which sets the swash plate (5) in rotation and comprises a pinion (20) which meshes with a toothed ring (21) arranged concentrically to the axis of rotation on the swash pate, characterised in that the swash plate (5) has two concentric annular flanges (22, 23) which extend parallel to one another and are connected to one another by way of an annular base (24) extending at an angle to the axis of rotation, and in that the toothed ring (21) is integrally formed in one of these annular flanges (22, 23).
2. A swash plate pump according to Claim 1, characterised in that the pinion (20) revolves about an axis extending parallel to the axis of rotation of the swash plate (5).
3. A swash plate pump according to Claim 1 or 2, characterised in that the toothed ring (21) is arranged in a plane which extends perpendicularly to the axis of rotation of the swash plate.
4. A swash plate pump according to one of Claims 1 and 2, characterised in that the toothed ring (21) is inclined with respect to the axis of rotation of the swash plate (5).
5. A swash plate pump according to Claim 4, characterised in that the plane of the toothed ring (21) extends parallel to the contact face of the swash plate.
6. A swash plate pump according to one of the preceding claims, characterised in that the toothed ring (21) is integrally formed in the inside of the inner annular flange (22).
7. A swash plate pump according to one of Claims 1 to 5, characterised in that the toothed ring (21) is integrally formed in the outside of the outer annular flange (23).
8. A swash plate pump according to one of the preceding claims, characterised in that the swash plate (5) is deep drawn.
9. A swash plate pump according to one of the preceding claims, characterised in that the pinion (20) has a circular cylindrical outer face which is arranged concentrically to the axis of rotation of the pinion (20) and carries the teeth of the pinion (20) which mesh with the toothed ring (21).
10. A swash plate pump according to Claim 9, characterised in that the teeth of the pinion (20) extend parallel to its axis of rotation.
11. A swash plate pump according to Claim 9, characterised in that the pinion (20) and the toothed ring (21) are obliquely toothed.
12. A swash plate pump according to one of the preceding claims, characterised in that the toothed ring (21) and the swash plate (5) are made of different materials and are fixedly connected to one another.
13. A swash plate pump according to Claim 12, characterised in that the toothed ring (21) is constructed as an insert inserted in the swash plate (5).

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