CN1185197A

CN1185197A - Positive displacement hydraulic machine

Info

Publication number: CN1185197A
Application number: CN96194082A
Authority: CN
Inventors: R·G·皮奇; B·温; J·A·西凯斯
Original assignee: David Brown Hydraulics Ltd
Current assignee: David Brown Hydraulics Ltd
Priority date: 1995-04-01
Filing date: 1996-03-29
Publication date: 1998-06-17
Also published as: GB9506826D0; ATE180043T1; KR19980703498A; WO1996031701A1; AU5156496A; DE69602435D1; EP0819218A1; EP0819218B1; DE69602435T2; JPH11503213A

Abstract

A positive displacement hydraulic machine comprises a casing (10) in which there are formed overlapping bores (16) adapted to receive two gears for rotation in mesh with each other. One or more end covers (14) are provided which are located on the casing (10) by means of an integral non-circular spigot (56) which is a direct interference fit into the adjacent ends of the overlapping bores (16).

Description

Positive displacement hydraulic machine

The present invention relates to a kind of positive displacement hydraulic machine, comprise gear pump or gear motor, this pump or motor have main body, form the hole of intersecting in this main body, dispose the gearing that is meshing with each other and rotates in the hole.This main body is suitable for the gearing of admitting its tooth top portion to have the smallest radial gap and have minimum axial gap on its end face.This main body comprises shell and two end caps, in this end cap bearing is housed, is used to support two parallel shafts that the respective gears device is housed, wherein at least one end cap separates with shell, so that can assemble this machine, this end cap is fastened on the shell with for example fixing bolt.One end of one of them rotating shaft stretches out main body, constitutes power input shaft under the situation of gear pump, and at the next formation pto of the situation of motor.

For effective operation with high pressure, it is epochmaking that the installation of bearing and maintenance are aimed at accurately.The method of accomplishing this point so far is use the cooperation pin between shell and the aforesaid end cap that respectively separates, but these methods to make manufacture process and assembly process very complicated.In B. P. GB2247923A, propose, on shell abutting end surface, form the non-circular projection of periphery, in the outer rim coupling recess that this projection is a tight fit in form on the end cap, thus the aforesaid end cap that each separates is configured on the shell exactly.This method makes manufacture process become complicated, because shell and lid all need extra accurate machining.

The objective of the invention is to utilize simple mode to reach accurately aims at.

The present invention includes positive displacement hydraulic machine, this hydraulic press comprises a main body, form the hole of intersecting on the main body, this hole is suitable for receiving two gearings that are meshing with each other and rotate, and comprise that one or more end caps, this end cap are suitable for utilizing the whole non-circular projection in the end that the hole is intersected in direct embedding to be configured on the shell.

The end outline of projection preferably includes two parts that intersect circle, and this part is coupled together smoothly by camber line and forms a waist shape that is approximately numeral " 8 ".

Although projection can be a micro-gap be engaged in intersect the hole in the end, it preferably is force-fitted in wherein.

Fillet be preferably formed in the interior edge face of lid and the projection that forms on it between, and admit the chamfering of this fillet to be formed on to intersect the hole on the end, help end cap is force-fitted in the shell.

With reference to the accompanying drawings, only introduce the preferred embodiments of the present invention as an example.These accompanying drawings are:

Fig. 1 is the end elevation with gear pump shell aperture end of an entire terminal cover;

Fig. 2 is an enlarged view of irising out the zone among Fig. 1 at numbering 2 places;

Fig. 3 is the sectional view along the 3-3 line of Fig. 1;

Fig. 4 is the end elevation of its internal surface of end cap of separating with shell;

Fig. 5 is the sectional view along the 4-4 line of Fig. 4.

With reference to the accompanying drawings, the gear pump main body comprises shell 10 and the end cap 12 of integral body and independent end cap 14.As shown in Figure 1, the parallel hole 16 that intersects is formed in the shell 10, and the center line in hole 16 is positioned at plane 18, and described parallel hole 16 intersects at relatively two

parallel slots

20 and 22 places perpendicular to plane 24 symmetries on plane 18.The degree of depth of groove 20 is greater than groove 22.The inlet 26 of center line in plane 24 is communicated with groove 20, and the center line outlet in this plane 28 equally is communicated with groove 22.

Shell 10 has flat end face 30, four tapped holes 32 of processing and an asymmetrical groove 34 on this plane.Parallel blind hole 36 is not exclusively coaxial with crossing hole, and this blind hole processing is used to admit the bearing of an end of the rotating shaft of installation gear in shell 10.This gear arrangement is in hole 16 in use.Form chamfering 38 on the open end that intersects hole 16, the corresponding position of this chamfering on the hole is (clear one of them position that illustrates of Fig. 2) that disconnects, and this off position is included in (for example 1 millimeter)

whole bump

40,42 very short on the circumference.

As shown in Figure 4, independent end cap 14 forms non-circular projection 50 on the end surfaces 52 within it, and the end profile of this projection comprises two parts that intersect circle, and this part is coupled together smoothly by camber line 56 and constitutes approximate figure of eight lumbar shape.These parts directly and the open end in the crossing hole 16 on the shell 10 form slight, for example 50 microns press fit.The interior edge face 52 of end cap 14 and on the fillet 58 that forms between the projection 50 that forms should be small enough to be received within the space that constitutes by chamfering 38.

Four mesopores 60 of processing on the end cap 14, four tapped holes processing on this hole and the shell 10 are aimed at.

Form holes

62 and 64 parallel and that accurately aims at parallel hole 36 on end cap 14, in order to the bearing of the rotating shaft the other end to be installed, the gear that is configured in the associated orifices 16 is carried in this rotating shaft.Hole 62 is blind holes, but hole 64 passes completely through end cap 14, makes an end of respective axes of rotation stretch out the gear pump main body, and to constitute power input shaft, hole 64 is suitable for laying oil sealing device.

The method of assemble pump is that elder generation is contained in bearing in

hole

36,62 and 64 and with oil sealing device and is contained in the hole 64; After an end of rotating shaft is contained in the bearing in the hole 36, and "O is contained in the groove 34, then end cap 14 is contained on the other end of rotating shaft, and four fixing bolts is inserted through hole 60 and hole 32 engagements.Tighten fixing bolt, make projection 50 by chamfering 38 be press fit into intersect hole 16 in the end, make

hole

32,62 and 64 all aim at exactly and securely."O in groove 34 is compressed, thus the joint close between the interior edge face 52 of the Transverse plane 30 of can 19 and end cap 14; And

bump

40 and 42 deforms, thus the curved channel of blocking-up from the delivery side of pump side to inlet side, otherwise will between chamfering 38 and fillet 58, produce seepage.

The profile of projection 50 needn't be with described herein consistent with preferable shape that illustrate, and micro-gap cooperates but this projection must form closely with crossing hole 16 opening ends on the shell 10, or preferably forms

press fit.Bump

40 and 42 can be formed on the fillet 58 rather than be formed on the chamfering 38.The present invention not only can be applicable to gear pump, and can be applied to equally on the mekydro motor.

Claims

1. the hydraulic press of a positive discharge capacity, comprise a main body, the crossing hole of two gearings that forming on the main body is suitable for packing into intermeshes and rotate, also comprise one or more end caps, this end cap is suitable for utilizing whole non-circular projection to be configured on the shell, this projection can be directly embedded into intersect the hole in the end.

2. hydraulic press as claimed in claim 1, wherein, the end outline of projection comprises two parts that intersect circle, this part couples together the shape that forms waist by camber line.

3. hydraulic press as claimed in claim 1 or 2, wherein, projection be force-fitted in intersect the hole in the end.

4. as the described hydraulic press of above-mentioned each claim, wherein, the interior turning that projection bottom meets at end cap makes fillet, and intersects outer turning that the hole meets at shell by respective chamfered corners, makes it can admit this fillet and help end cap is force-fitted in the shell.

5. as in this application with reference to accompanying drawing illustrated with positive displacement hydraulic machine shown in the drawings.