CN201377432Y - Crescent gearpump combined unloading groove - Google Patents
Crescent gearpump combined unloading groove Download PDFInfo
- Publication number
- CN201377432Y CN201377432Y CN200920068860U CN200920068860U CN201377432Y CN 201377432 Y CN201377432 Y CN 201377432Y CN 200920068860 U CN200920068860 U CN 200920068860U CN 200920068860 U CN200920068860 U CN 200920068860U CN 201377432 Y CN201377432 Y CN 201377432Y
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- China
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- oil
- gear
- compensating groove
- unloading
- groove
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Abstract
The utility model relates to a crescent gearpump combined unloading groove which is located in a pump body oil discharge area. The structure is of a circle flat-bottom counter bore, wherein the center line of the bore is parallel to the axis of gears. When the pocketed oil phenomenon occurs on the gear pair, the unloading groove can be used for communicating a pocketed oil area and a pump oil discharge area among the meshing points of the gears, so as to play a role of unloading. The excircle of the unloading groove is crossed with the inner hole on a pump body for holding a gear ring; an oil storage groove is formed on the pump body to provide lubricating oil for the friction position of the gear ring, thereby reducing the abrasion during working. The unloading groove has the advantages that the size is bigger, and channel switching does not exist during unloading, therefore, the unloading effect is improved; meanwhile, the unloading groove can provide the oil for lubricating the gear ring, thereby avoiding the arrangement of a complicated lubricating oil channel on the pump body.
Description
Technical field
The utility model belongs to the hydraulic machinery technical field, is specifically related to a kind of crescent gear pump combined type compensating groove.
Background technique
Crescent gear pump partly is made up of meshed gears in the pump housing, a pair and gear ring, the live axle that connects with gear and oil inlet and outlet etc.Have circular hole on the pump housing, gear and gear ring are positioned at this circular hole, and two Gear centers have definite throw of eccentric according to gear parameter, to guarantee interior engagement driving.Opposite side in the two-wheeled contact points has the swing link that is fixed on the pump housing, and the space between the inside and outside gear teeth is divided into independently enclosed space of two of oil sucting cavity and pumping cavities.When the live axle driven gear rotated, gear ring also rotated in the same way, was separated from each other the formation negative pressure and sucked fluid at the oil sucting cavity gear teeth, and constantly enter engagement and fluid is pushed output at the pumping cavity gear teeth.Because the radial compression applied of pump inner fluid, gear ring can produce friction with the pump housing in rotation process, therefore on the pump housing, must have oil leab, allow a spot of high pressure oil enter gear ring and form lubricant film with the circumferential surface that cooperates of the pump housing, the processing of oil leab is difficulty relatively, also needs to be provided with throttle element in the oil duct.
In order to guarantee the sealing between transmission of crescent gear pump stable gear and the suction pumping cavity, require the engagement overlap coefficient of gear pair to be greater than 1, that is to say last the gear teeth are broken away from engagement before, the a pair of gear teeth in back just begin to enter engagement, just have two pairs of adjacent gear teeth and mesh simultaneously in a period of time, the fluid of staying the wheel between cog can be trapped in the enclosed cavity that the gear teeth of two pairs of engagements form.When gear pair remained in operation, the volume of this enclosed space reduced before this gradually, and the liquid that is closed is squeezed, and pressure sharply raises; The volume of enclosed space increase to form negative pressure again gradually then, the entrap phenomenon of Here it is gear pump.
Entrap phenomenon can produce load fluctuation, causes harm such as vibration, noise and cavitation, and gear pump service behaviour, life-span and intensity are all had adverse influence.Generally adopt the way of on the pump housing of gear face, opening compensating groove to eliminate entrap phenomenon.Its principle is to guarantee to manage to make protected oil volume constantly to communicate with oil sucting cavity and oil sucting cavity respectively in difference under the prerequisite that the suction pumping cavity is not linked up mutually.Compensating groove structure commonly used at present is the two compensating grooves with respect to Gear center line symmetric arrangement, but crescent gear pump generally all adopts end face to join oily mode, and the size of the compensating groove of two compensating groove structures is smaller, and the off-load ability is little when causing work.In the compensating groove working procedure, the pocketed oil district will change unloading channel between oil sucting cavity and pumping cavity, because gear rotating speed originally is very high, and the flowing state more complicated of liquid, the passage conversion also brings adverse influence to the off-load effect.
Summary of the invention
The purpose of this utility model is exactly in order to solve the deficiencies in the prior art, provides a kind of simple in structure, and the crescent gear pump compensating groove structure that the off-load action range is big, effective does not need to carry out the passage conversion and just can realize the district's off-load of gear engagement pocketed oil; Compensating groove can also substitute the lubricating oil path on the pump housing simultaneously, for the gear ring rubbing surface provides lubricant oil.
The utility model purpose realizes by a kind of combined type compensating groove, its structure as shown in Figure 1, compensating groove is positioned at pump housing pumping cavity, structure is the circular flat bottom counterbore, the center line in hole and the parallel axes of gear; The compensating groove cylindrical intersects with a back contact points P who is positioned at terminating point position, gear pair bidentate meshing zone, can guarantee like this in whole bidentate engagement range, compensating groove can both make pocketed oil district and oil extraction district UNICOM, realizes the function of off-load, can not communicate and produces internal leakage because of the high low pressure oil pocket again.Compared with prior art, the size of compensating groove is bigger, and does not have the passage conversion in the off-load process, and the off-load effect is improved.
Another characteristics of the present utility model are that the endoporus that holds gear ring on the compensating groove cylindrical and the pump housing intersects, its objective is and on the pump housing, form an oil storage tank, and the compensating groove bottom surface exceeds 1～2 millimeter than gear upper and lower end face respectively along axial direction, forming oil duct links to each other oil storage tank with the laminated oil zone of pump, help forming lubricant film, gradually less wear at gear ring friction position.The width of oil storage tank is that 1/8th of compensating groove circumferential length arrives sixth.
Compared with the prior art, advantage of the present utility model is that compensating groove is simple in structure, off-load is effective, can satisfy the requirement of crescent gear pump off-load, alleviate harm such as vibration that pocketed oil brings, noise, also simultaneously can also provide lubricant oil for the gear ring friction surface, have the dual-purpose complex function of a groove, avoided on the pump housing, being provided with complicated oil leab.
Description of drawings
Fig. 1 is the utility model compensating groove key plan.
Fig. 2 is the utility model embodiment overall construction drawing.
Fig. 3 is the utility model example structure sectional view (removing gear-wheel gear-ring).
Piece mark among the figure: 1-live axle, 2-seal ring, 3-bearing cap, the 4-oil-feed pump housing, 5,14, the 16-sliding bearing sleeve, 6,11-gear, 7, the 15-key, 8, the 10-gear ring, the pump housing in the middle of the 9-, the 12-oil extraction pump housing, 13-pump housing bonnet, 17-rolling bearing, 18-screw, 19-bolt.
Embodiment
Below in conjunction with embodiment structure of the present utility model is elaborated.Fig. 2 has represented that the present invention meshes the mode of execution in the twin-stage gear pump, the delivery pressure 25MPa of pump, rated speed 1500rpm in a straight-tooth conjugate.Figure middle gear pair 6,8 constitutes the first order of pump, and 10,11 constitute the second level of pump.Two gears connect with live axle 1 by key 7,15 respectively, rotate under motor drives.The pump housing is connected by four bolts 19 by the oil-feed pump housing 4, the middle pump housing 9, the oil extraction pump housing 12 and pump housing bonnet 13 and forms, and live axle is bearing on the pump housing by rolling bearing 17 and sliding bearing sleeve 5,14,16.Have the little oilhole that lubricated rolling bearing is used on the oil-feed pump housing, and seal ring 2 is installed in case stopping leak leaks at the external part of axle, seal ring is fixing by bearing cap 3 and screw 18.
In the endoporus in the middle of two gear rings lay respectively on the pump housing and the oil extraction pump housing, and with separately gear engagement.When gear pump is worked, filler opening on hydraulic oil the past pump housing flows into, enter the oil sucting cavity of first order pump top, be brought into the pumping cavity of below along with the rotation of gear pair 6,8, enter the oil sucting cavity of pump below, the second level then by the oil duct of the middle pump housing, along with the rotation of gear 10,11 is brought into the pumping cavity of top, discharge from oil outlet by the oil duct on the pump housing bonnet at last.
Two-stage at pump all is provided with the crescent gear pump combined type compensating groove that the utility model proposes, and two compensating groove structures are identical, as shown in Figure 3.
Claims (4)
1. crescent gear pump combined type compensating groove, it is characterized in that: compensating groove is positioned at pump housing oil extraction district, and structure is the circular flat bottom counterbore, the center line in hole and the parallel axes of gear.
2. crescent gear pump combined type compensating groove as claimed in claim 1 is characterized in that: the compensating groove cylindrical intersects with a back contact points that is positioned at terminating point position, gear pair bidentate meshing zone.
3. crescent gear pump combined type compensating groove as claimed in claim 1 or 2 is characterized in that: the endoporus that holds gear ring on the compensating groove cylindrical and the pump housing intersects, and the arc length of intersection is that 1/8th of compensating groove circumferential length arrives sixth.
4. as the described crescent gear pump combined type of claim 1,2 or 3 compensating groove, it is characterized in that: the compensating groove bottom surface exceeds 1～2 millimeter than gear upper and lower end face respectively along axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920068860U CN201377432Y (en) | 2009-03-16 | 2009-03-16 | Crescent gearpump combined unloading groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920068860U CN201377432Y (en) | 2009-03-16 | 2009-03-16 | Crescent gearpump combined unloading groove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201377432Y true CN201377432Y (en) | 2010-01-06 |
Family
ID=41517540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920068860U Expired - Lifetime CN201377432Y (en) | 2009-03-16 | 2009-03-16 | Crescent gearpump combined unloading groove |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201377432Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527470A (en) * | 2013-10-15 | 2014-01-22 | 成都大学 | External gear pump with auriculate unload groove |
| CN104564654A (en) * | 2013-10-15 | 2015-04-29 | 上海裕顺机械厂 | Low-noise long-life turning internal gear pump and manufacturing method thereof |
-
2009
- 2009-03-16 CN CN200920068860U patent/CN201377432Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527470A (en) * | 2013-10-15 | 2014-01-22 | 成都大学 | External gear pump with auriculate unload groove |
| CN104564654A (en) * | 2013-10-15 | 2015-04-29 | 上海裕顺机械厂 | Low-noise long-life turning internal gear pump and manufacturing method thereof |
| CN103527470B (en) * | 2013-10-15 | 2015-07-01 | 成都大学 | External gear pump with auriculate unload groove |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100106 |