FI98949C - Pump - Google Patents

Description

98949

The present invention relates to a pump comprising an axially rotatably mounted toothed rotor 5 in engagement with an internally toothed ring rotatably mounted on a second parallel shaft in the pump body, the ring having more teeth or protrusions than the rotor; and a gearbox for driving the rotor, which gearbox is mechanically connected to the rotor and mounted on a shaft. On the plane side comprising the shafts, the spaces delimited by each tooth or protrusion open on the suction side, and on the other side of the plane, they open on the discharge side. The relative rotational movement causes the movement of said spaces around the axes and thus the variation of the volume, causing a flow to the chambers on the suction side and an outflow on the outlet side.

The pump can be operated, for example, via a flange according to DE-A-35 04 306 or via a rotor according to FR-A-2 527 683, the rotor being mounted on a fixed shaft (which has a tube forming part of the fluid flow path) and the root has protruding teeth which engage with the corresponding bores of the drive gearbox, which gearbox is also mounted on the shaft. The problem with this arrangement is that the pump requires a considerable space in the axial direction: first, such a gerotor pump has a certain unavoidable axial length, which is one of the parameters related to the power characteristics of the pump. as the axial length is here necessary for the mechanical coupling between the teeth • · · .// and the complementary structure of the drive gearbox • · · * · [*. In addition, an axial ·: · length is required for adequate bearing of the drive gear itself.

I t • ♦ 2 98949

In many situations where these gerotor pumps are used, space is limited, and thus it is an object of the present invention to provide a rotor-driven gerotor pump that requires less axial ti-5a.

This object is achieved by a pump according to the invention, which is characterized in that the gearbox and the rotor are mechanically connected to each other inside the axial dimensions of the rotor.

10 The gearbox and the rotor may be mounted directly on the shaft in its successive axial regions, and that the gearbox has drive teeth which engage in the axial direction with correspondingly shaped rotor recesses.

Various embodiments of the invention will be described in more detail with reference to the accompanying drawings, in which:

Figure 1 is a partial vertical sectional view of the first embodiment?

Figure 2 is a cut-away side view of the same embodiment;

Fig. 3 is a view similar to Fig. 1 showing another embodiment.

• · ·: Referring to Figures 1 and 2, the pump body 10 is provided with one or more suction passages 12 which 25 open through a side wall (not shown) into the cavity if there is a ring 14 and a rotor 16. The discharge passage opens therefrom. · ·: * · *: From the cavity. It is desirable that both suction and discharge can .V. generally open radially or tangentially from the cavity or through one or another sidewall, or a combination of these as required.

• · ·

The shaft 18 is fixedly attached to the frame, for example by a • · · ’compression fitting. In Figure 1, it is provided with bearing bushes 20 to 22 for bearing the rotor 16 and the drive wheel 24. The dotted duct system 35 30-32 communicates with the opening 34 to allow lubrication of the slender.

3 98949 The drive wheel (or sprocket 24) is provided with axially extending prongs 28 (see Fig. 2) which are in tooth contact with the respective prongs 26 of the rotor 16 so that the gear and the rotor 5 are directly connected together. Thus, the gear rotates the rotor, which in turn rotates the ring at different speeds, causing the conventional gerotor pump to operate.

Referring to Figure 3, the arrangement is generally similar except that this gear 24 has 10 hub portions 38 entering the rotor 16 so that the rotor can be considered to be indirectly mounted on the shaft. The hub and the rotor are connected to each other by a wedge or axial groove at 46.

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Claims (3)

98949 A pump comprising an externally toothed rotor (16) rotatably mounted on a shaft (18) in communication with an internally toothed ring (14) rotatably mounted on a second parallel shaft in the pump body (10), wherein the ring (14) has more teeth or projections than the rotor (16); and a gearbox (24) for driving the rotor, which gearbox (24) is mechanically connected to the rotor (16) and mounted on a shaft (18), characterized in that the gearbox (24) and the rotor (16) are mechanically connected to each other by a rotor (16). ) inside the axial dimensions. Pump according to Claim 1, characterized in that the gearbox (24) and the rotor (16) are mounted directly on the shaft (18) in successive axial regions thereof, and in that the gearbox (24) has drive teeth (28) which engage in the axial direction. 20 with correspondingly shaped recesses in the rotor (16). The pump of claim 1, wherein; characterized in that the gearbox (24) has a hub portion (38) which is mounted on the shaft (18), and in that to form the hub portion (38) of the 25 exterior is keyed or splined to one of the rotor (16) ··· inside of the mechanical coupling • · · · Between them, whereby the rotor (16) is thus mounted indirectly on the shaft (18). * · · • «• ♦ • · • · 1 ·« • · · I I I «98949