CN2217122Y - Improved high pressure gear oil pump - Google Patents

Abstract

The utility model relates to an improved high pressure gear oil pump, comprising a front pump cover 3, a pump body 6, a back pump cover 12, a driving gear shaft 1, a driven gear shaft 14, a shaft sleeve 5, a bearing 13, reinforced oil seal 2 and an unloading slot 17. The improved high pressure gear oil pump is characterized in that the front pump cover 3, the pump body 6 and the back cover 12 are positioned by four positioning cylindrical pins 4. The improved high pressure gear oil pump has the advantages that the improved high pressure gear oil pump adopts the cylindrical pins with low accuracy and pin holes to position, the position is accurate and reliable, the requirement of the processing technology is low, the structure is reasonable, the processing cost is low, and the use is reliable.

Description

A kind of improved high pressure gear oil pump

The utility model relates to gear oil pump, and particularly working pressure is greater than the high pressure gear oil pump more than 25 MPas.

The oil pump of prior art as the floating shaft type gear pump in the Chinese patent 87102829.8, gear motor, because it relies on the slide pad location, causes interference, causes the axle sleeve eccentric wear, and efficient is reduced.

The purpose of this utility model is in order to overcome above deficiency, to design a kind of improved high pressure gear oil pump.

The purpose of this utility model is to realize according to following structure.High pressure gear oil pump comprises front pump cover, the pump housing, and rear pump cover, driving gear shaft, driven gear shaft, axle sleeve, bearing, and outside framework oil seal, compensating groove passes through four positioning cylinder finger settings between front pump cover and the pump housing and bonnet.

Having a compensating groove and the axial float compensating tank that catch and seal ring are housed on the protecgulum with on the end face that the pump housing matches, there is a through hole to communicate in this groove with oil drain out and pressure oilhole.

On the facet that two of last Lower shaft sleeve matches, has compensating groove, oilhole on its end face communicates with high pressure oil groove in the endoporus, high pressure oil groove both sides have two secondary seal grooves, an oilhole that communicates with the high pressure oil groove is also arranged on the arcuate surface on the outer surface of axle sleeve, in the groove around the arcuate surface arc seal ring with matching and an arc block plate arranged.

In the high pressure oil groove in the endoporus of axle sleeve a circumference axial cross section being arranged is the seal ring of U-shaped or V-arrangement.

Above structure has promptly realized the purpose of this utility model.

The utility model has the advantages that straight pin and pin-and-hole location to adopt low precision, accurate positioning is reliable, and processing technology requires lower, rational in infrastructure, and processing cost is low, uses reliable.

Description of drawings, Fig. 1 are longitudinal sectional views of the present utility model; Fig. 2 is A-A sectional view of Fig. 1; Fig. 3 be figure one analyse and observe B-B sectional view; Fig. 4 is the axonometric drawing of axle sleeve and arc seal ring and arc pad; Fig. 5 is C-C sectional view of Fig. 1; Fig. 6 is that the D of Fig. 4 Intermediate shaft sleeve is to view; Fig. 7 is the positive view of Fig. 4 axle sleeve; Fig. 8 is the half sectional view of the seal ring in the axle sleeve.The name of each sequence number in the accompanying drawings is called: 1 driving gear shaft, 2 outside framework oil seals, 3 protecgulums, 4 bearings, 5 axle sleeves, 6 pump housings, 7 catch (arc), 8 seal rings (arc), 9 sealings, 24 secondary seal oil grooves, 10 seal rings, (the sealing circle is contained in the high pressure oil groove of sequence number 23), 11 pads, 12 bonnets, 13 bearings, 14 driven gear shafts, 15 catch, 16 seal rings, 17 compensating grooves, 18 screws, 19 oil outlets, 20 and 21 pressure oilholes, 23 high pressure oil grooves, 25 axle sleeves, 5 outer surface large curved surfaces, the apparent little curved surface of 26 axle sleeves 5,27 high pressure oilholes, 28 oilholes, 29 seal rings, 30 compensating grooves, 31 compensating grooves, plane on 32 axle sleeves 5,33 back pressure grooves, 34 oil inlet holes.

Describe structure of the present utility model in detail below in conjunction with the embodiment in the accompanying drawing.With reference to accompanying drawing.Protecgulum 3, the pump housing 6 and bonnet 12 are formed the main body of pump, and pump housing inner-cavity structure is ＂ 8 ＂ shapes.Driving gear shaft 1 is equipped with in inside, and 14, four axle sleeves 5 of driven gear shaft are equipped with bearing 13 in each axle sleeve, seal ring 10 and pad 11.Four straight pins 4 are arranged on the pump housing, the pump housing and front and back pump cover location are assembled together, and fastening with four screws 18.Have a compensating groove 30 on the end face that matches with the pump housing 6 on the protecgulum 3, axial float realizes having a through hole 28 to communicate with the hole 20 of oil drainage hole 19 by catch 15 in the axial float compensating tank and seal ring 16 in this groove.On the facet 32 that two of two axle sleeves 5 match, have compensating groove 31, rely on seal ring 29 to realize end face seal between the pump housing 6 and front and back pump cover 3 and 12.The compensating groove 17 that has a compensating groove 30 and oil sealing 2 places on the protecgulum communicates, and makes the pressure oil of leakage get back to low voltage side by 17 through 30 off-loads, has prevented the puncture of oil sealing 2 effectively.In the inside of axle sleeve 5 high pressure oil groove 23 is arranged, a seal ring 10 is arranged in this oil groove, respectively there is (group) seal groove 24 both sides of high pressure oil groove, by with the synergy of rolling bearing 13, realize the secondary seal of high pressure oil.Have the radially back pressure groove 33 of ＂ degree of lip-rounding ＂ at the outer surface of axle sleeve, place seal ring 8 and the catch 7 identical in the groove with groove shape.Pad 11 is located at the inside of axle sleeve 5, and concordant with the end face of axle sleeve 5, as the planar support skeleton of axial float, simultaneously also attenuate the integral thickness of pump.The large curved surface 25 of the outer surface of axle sleeve and little curved surface 26 are on same cylinder curved surface, bigger gap is arranged between the inner chamber of the cylindrical of axle sleeve 5 and the pump housing 6, thereby radially rely on arc seal ring 8 and arc block plate 7 to realize radial floating compensation and radial seal with the part that pump housing inner chamber is contained.A high pressure oilhole 27 that communicates with high pressure oil groove 23 is arranged on little curved surface 26, and when the pressure of pump raise, pressure oil entered axial back pressure groove (15 and 16 place) through oil outlet 19, pressure oilhole 20,28, realized axial float compensation and sealing.Aperture 21 on the pressure oil warp beam sleeve end face enters in the high pressure oil groove 23, is entered radially in the back pressure groove 33 by high pressure oilhole 27 then, realizes radial floating compensation and sealing.Have compensating groove 31 on the facet 32 of axle sleeve 5,, reduce the Separating force of axle sleeve junction plane, increase sealing so that the pressure oil that leaks is in time got back to low pressure area.More reliable for the operation that makes pump, prevent pad 11 displacement, cause bearing 13 to lose efficacy, the seal ring 10 that in the high pressure oil groove 23 of axle sleeve 5 cross section to be housed be U-shaped or V-arrangement, this circle constitutes secondary seals with sealing oil groove 24.

Under the drive of gear pump at power source, rotate according to the direction shown in the arrow among the figure two, driving gear shaft 1 drives driven gear shaft 14 rotations, suck hydraulic oil from filler opening 34, rely on two gear meshing squeezing actions, from oil outlet 19 head pressure oil, supply with hydraulic system and keep normal work.Pump pressure inside oil provides by oil drain out 19 and pressure oilhole 20, supply shaft to back pressure groove radially.So that realize the axial and floating compensation radially of axle sleeve.Axially, pressure oil enters by in the 15 and 16 axial seal grooves that constitute by the hole 28 of the pressure oilhole 20 on the pump housing 6 on rectangle catch 15, promotes axle sleeve 5 and realizes the axial floats compensation, realizes the axial seal of axle sleeve, the pump housing and front pump cover simultaneously.Radially, pressure oil is by the oilhole 21 on the end face of axle sleeve 5, through high pressure oil groove 23 and the U of seal ring 10 or the passage of V-arrangement (or Y shape) cross section formation, in oilhole 27 enters radially back pressure groove 33, promote two (actual is four) axle sleeves, the compensation of realization radial floating also realizes radial seal simultaneously.

Because this pump has been realized axially and radially floating compensation and sealing simultaneously.Reduce leakage, improved the volumetric efficiency of pump.

Claims (4)

1, a kind of improved high pressure gear oil pump comprises front pump cover 3, the pump housing 6, rear pump cover 12, driving gear shaft 1, driven gear shaft 14, axle sleeve 5, bearing 13, and outside framework oil seal 2, compensating groove 17 is characterized in that between the front pump cover 3 and the pump housing 6 and the bonnet 12 by four setting circle pins, 4 location.

2, the described high pressure gear oil pump of a kind of claim 1, have a compensating groove 30 and the axial float compensating tank that catch 15 and seal ring 16 are housed on the end face that it is characterized in that matching with the pump housing 6 on the protecgulum 3, have a through hole 28 to communicate in this groove with oil drain out 19 and pressure oilhole 20.

3, a kind of claim 1 or 2 is ground the high pressure gear oil pump of stating, it is characterized in that having compensating groove 31 on the facet 32 that two of Lower shaft sleeve 5 matches, oilhole 21 on its end face communicates with high pressure oil groove 23 in the endoporus, the both sides of high pressure oil groove 23 have two secondary seal oil grooves 24, an oilhole 27 that communicates with high pressure oil groove 23 is also arranged on the arcuate surface on the outer surface of axle sleeve 5 26, there is an arc seal ring 8 with matching and an arc block plate 7 on surface 25 and 26 in the groove around the arcuate surface 26 on same arcuate surface.

4, according to the described high pressure gear oil pump of claim 3, the seal ring 10 that to it is characterized in that in the endoporus 23 of said axle sleeve 5 a circumference axial cross section being arranged be U-shaped or V-arrangement.

Images