GB2079404A

GB2079404A - Coupling assembly for mechanically coupling a driving motor and a hydraulic pump

Info

Publication number: GB2079404A
Application number: GB8119028A
Authority: GB
Original assignee: ZETA FLUID Srl
Current assignee: ZETA FLUID Srl
Priority date: 1980-06-30
Filing date: 1981-06-19
Publication date: 1982-01-20
Also published as: GB2079404B; IT8022153V0; FR2485662B3; DE8118102U1; FR2485662A3

Abstract

A coupling device for mechanically coupling an electric driving motor (1) to a hydraulic pump (10) comprises a first coupling member (4) coupled to a flange (2) of the motor (1), a second coupling member (6) coupled to the free end of the first coupling member (4), and a third coupling member (8) coupled to the free end of the second coupling member (6), the free end of the third coupling member (8) being coupled to a flange (11) of the hydraulic pump (10). The second coupling member (6) may be cylindrical or frusto- conical, and the third coupling member (8) is adapted to receive a variety of types of pump flange (11). <IMAGE>

Description

SPECIFICATION Coupling assembly for mechanically coupling a driving motor and a hydraulic pump i The present invention relates to a multi-part cou pling assembly for mechanically coupling a driving motor to a hydraulic pump.

The use of a so-called coupling spider to couple an electric driving motor to a hydraulic pump is well known. More specifically, for carrying out this cou pling, a flange member of the coupling spider is coupled to a flange of the motor, while the other side of the spider is coupled to a flange member of the hydraulic pump, in such a manner that the shaft of the motor and the shaft of the hydraulic pump are coupled to the inside of the spider by means of suitable joints.

Also well known is the fact that the flange members of electric motors are standardized and accordingly they can easily be coupled to the corresponding coupling flange member of the spid er, this latter being suitable for taking up the motor driving power. The same is not true for hydraulic pumps, since there are available on the market pumps provided with square flanges, rectangular flanges and oval flanges.

This fact in practice necessitates the provision of a selected spider for each pump, each spider being provided with a flange member suitable for coupling to the flange member of a particular hydraulic pump.

Thus, until now it has been necessary to store a suitable coupling spider for each pump type. Such spiders are generally formed in a single piece by moulding aluminium or a like metal material.

In other words it has been necessary to have available in store a very large number of spiders to permit hydraulic pumps of various different con structions to be coupled to different power electric motors.

Moreover, the single-piece spiders, due to the particular shapes thereof, could not be stacked easily within a small space and accordingly both the storage and the delivery of the known coupling spiders has been very expensive. Frequently, the problem has also arisen that the appropriate spiders provided with flange members for coupling to a selected type of pump have not been available in store.

The present invention sets out to eliminate the aforesaid drawbacks of the prior art and to provide a coupling spider, formed from individual coupling pieces effective to be coupled to one another, which can be coupled to different flange members of hydraulic pumps, as well as to the flange members of electric driving motors, thereby affording the possibility of coupling practically all known hyd raulic pumps, using a reduced number of coupling members or means, to the corresponding driving motors, for example within a power range from 0.16 Hp to about 220 Hp.

It is further possible with the invention to standar dize as far as possible the separate spider-forming coupling members, while affording the possibility of stacking and storing the various coupling pieces in a relatively small space.

According to the present invention there is provided a coupling assembly for mechanically coupling a driving motor to a hydraulic pump, comprising a first coupling member arranged to be coupled to a flange of the motor, a second, intermediate coupling member arranged to be coupled to the free end of said first coupling member, and a third coupling member arranged to be coupled to the free end of said second coupling member, the free end of said third coupling member being arranged to be coupled to a flange of the hydraulic pump.

In one particularly advantageous embodiment, the first coupling member is shaped as a frustum of a cone in such a way as to permit such first coupling members to be stacked one above the other.

Advantageously, the second coupling member is shaped as a ring member provided with end coupling surfaces or faces, the coupling faces being so designed as to enable connection on the one hand to the free end of the first coupling member and on the other hand to the free end of said third coupling member.

The second, intermediate coupling member may be of cylindrical shape, thereby allowing for the free end of the first coupling member to be coupled to a third coupling member coupled to the hydraulic pump and having the same diameter as the free end of said first coupling member.

The second, intermediate coupling member may alternatively be frusto-conical in shape, thereby enabling the first coupling member coupled to the driving motor to be coupled to a third coupling member coupled to the hydraulic pump and having a smaller-diameterflange.

By turning the frusto-conical intermediate coupling member end-to-end through 180 it is possible to couple a first coupling member, having an end of relatively small diameter, to a third coupling member, coupled to the hydraulic pump, and having a flange of greater diameter.

An embodiment of coupling assembly or spider according to the present invention will now be described by way of example, and with reference to the accompanying drawings, in which: Figure 1 is an exploded view of the individual coupling pieces which make up the coupling assembly, as located between a driving electric motor and a hydraulic pump; Figure 2 is a cross-sectional view through a part of a coupling assembly or spider according to the invention, wherein, as the intermediate coupling member between the coupling member coupled to the motor and the coupling member coupled to the hydraulic pump there is provided a cylindrical ring;; Figure 3 is a cross-sectional view through a part of a coupling assembly or spider according to the invention, wherein as the intermediate coupling member between the coupling member coupled to the motor and the coupling member coupled to the hydraulic pump there is provided a frusto-conical ring which provides for a transfer from a greater diameterto a smaller diameter; Figure 4 is a cross-sectional view through a par a coupling assembly or spider according to the invention, wherein, as the intermediate coupling member between the coupling member coupled to the motor and the coupling member coupled to the hydraulic pump there is provided a frusto-conical ring which provides for a transfer from a smaller diameter to a greater diameter; Figure 5 is a plan view of the face of the coupling member associated with the hydraulic pump, as viewed along the line V-V of Figure 1; and Figure 6shows several frusto-conical coupling members, of the type associated with the driving motor, and stacked on one another.

With reference to Figure 1,an electric motor 1 is provided with a standardized coupling flange 2. A flange member 3 of a first coupling member indicated generally at 4 can be coupled to the motor flange 2 by means of screws (not shown).

The first coupling member 4 is of frusto-conical shape and is provided, at the smaller end thereof, with a recessed seat 5 which is effective to house a tapering portion 6a(6b) of a second, intermediate coupling member 6, further provided with a tapering portion 6b on the opposite end thereof.

The second, intermediate coupling member 6 may be shaped as a cylindrical ring or as a frusto-conical ring. In the latter case the tapering portions 6a and 6b will have different diameters. By means of screws (not shown) the second coupling member 6 can be firmly connected to the first coupling member 4. The tapering portion 6b at the pump end of the intermediate coupling member 6 can be introduced into a suitably recessed portion 7 of a third coupling member 8. The third coupling member 8 has an end portion 9, facing towards a flange member 11 of a hydraulic pump 10, which is constructed in such a way as to permit the hydraulic pump 10 to be coupled to it by means of this flange 11. This coupling is also advantageously carried out by means of screws (not shown).

Considering that the only structural element which, for a given power range, essentially varies in shape is the flange member 11 ofthe pump, which can assume any one of a variety of shapes, then it is sufficient to enable the face or pump-end portion 9 of the third coupling member 8 to be adaptable to the different requirements, while the same coupling member 4 may be used for all electric motors within a given power range, on the basis that nearly all electric motors are provided with a standardized coupling flange member 2.

With the provision of the intermediate coupling member 6, formed for example as a simple turned ring, it is possible to carry out the connection or coupling between the third coupling member 8 and the first coupling member 4 in the case of surfaces or end portions 7 and 5 having the same diameter. On the other hand, by using a frusto-conical intermediate coupling ring 6, it is possible to couple a first coupling member4 having a relatively large end 5 to a a third coupling member 8 having a relativaly smaller end 7, or, by turning the intermediate coupling member 6 end-to-end through 180 , it is possible to couple a first coupling member 4, having an end 5 of relatively small diameter to a third coupling member 8, having an end 7 of relatively large diameter.In this way the number of possible coupling combinations is further increased, without the necessity of using further coupling members.

This is clearly illustrated in Figures 2 to 4.

In Figure 2 a first coupling member4 is coupled with the interposition of an intermediate coupling z member 6, of cylindrical shape, since the diameter of the pump end 5 of the first coupling member 4 is equa! to the diameter of the motor end 7 of the third coupling member 8.

In Figure 3 there is illustrated the coupling of a first coupling member 4 by means of an intermediate frusto-conical coupling member 6, thereby narrowing down the pump end 5 of the first coupling member 4 to a motor-end 7 of the third coupling member 8 having a smaller diameter.

Obviously it is also possible, as is illustrated in Figure 4, to use the frusto-conical intermediate coupling member 8 to increase the flow crosssection from a smaller pump end 5 of the first coupling member 4 to a motor end 7 of the third coupling member of greater diameter.

Figure 5 is a plan view of the intermediate coupling member 8 with its pump end face 9 seen in plan.

From Figure 5 it can be seen that, by properly forming the pump end face 9, it is possible to effect a coupling to various different flange members 11 of hydraulic pumps. Thus, on the pump end face 9 of the third coupling member 8 it is possible to mount a pump provided for example with an oval flange member 11', our a nearly rectangular flange member 11", or a square flange member 11"', these shapes being indicated by the chain-dotted lines in Figure 5.

From Figure 6 it can be seen that the first coupling member 4 which is coupled by its flange member 3 to the flange member 2 of the driving motor can be stacked, for storage, on other such first coupling members 4 within a very small space.

While the designing ofthe coupling assembly or spider in a number of pieces would seem to be more expensive, it has been found that, owing to the various advantages obtained by using the multi-part coupling assemblies or spiders of the present invention, it is possible to achieve great savings and, furthermore, one does not require specifically designed spiders to be fitted each time to the intended pump. In fact, by using quite a small number of parts, effective to be mutually coupled to one another, it is possible to carry out nearly all the coupling operations which are generally needed between the different types of hydraulic pumps and electric driving motors for such pumps.

Claims

CLAIMS 1

1. Acoupling assembly for mechanically coupling a driving motor to a hydraulic pump, comprising a first coupling member arranged to be coupled to a flange of the motor, a second, intermediate coupling member arranged to be coupled to the free end of said first coupling member, and a third coupling member arranged to be coupled to the free end of said second coupling member, the free end of said third coupling member being arranged to be coupled to a flange of the hydraulic pump.

2. A coupling assembly according to claim 1, in which said first coupling member is frusto-conical in shape such as to permit such first coupling members to be stacked one above another.

3. A coupling assembly according to claim 1 or 2, in which said second coupling member is shaped as a ring member provided with end coupling faces, said coupling faces being so designed as to enable connection on the one hand to the free end of said first coupling member and on the other hand to the free end of said third coupling member.

4. A coupling assembly according to claim 1 or 2, in which said second coupling member is of cylindrical shape.

5. A coupling assembly according to claim 1 or 2, in which said second coupling member is frustoconical in shape.

6. A coupling assembly according to any preceding claim, provided with recesses and projections effective for mutual engagement in such a manner as to provide accurate aligned coupling between said coupling members.

7. A coupling assembly according to any preceding claim, in which coupling joints connecting the motor driving shaft and the hydraulic pump driving shaft are arranged to be housed within the coupling assembly.

8. A coupling assembly substantially as hereinbefore described with reference to the accompanying drawings.