CN101832263A - Straight-tooth conjugate crescent seal gear pump - Google Patents
Straight-tooth conjugate crescent seal gear pump Download PDFInfo
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- CN101832263A CN101832263A CN200910047421A CN200910047421A CN101832263A CN 101832263 A CN101832263 A CN 101832263A CN 200910047421 A CN200910047421 A CN 200910047421A CN 200910047421 A CN200910047421 A CN 200910047421A CN 101832263 A CN101832263 A CN 101832263A
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Abstract
The invention relates to a straight-tooth conjugate crescent seal gear pump which comprises a pump body with an inner hole, a pair of crescent seal gear pairs, a crescent plate, a driving shaft and other parts, wherein the crescent seal gear pairs can be freely rotated in the inner hole, the crescent plate is fixed on the pump body and used for separating an inner gear from an outer gear, and the driving shaft is used for driving the gear to rotate; the gear profile curve of the gear is a straight line, the gear height is greater than the actual gearing height, and a gear profile of a gear ring is divided into two parts, wherein a gear tooth part is a working gear profile, conjugate with a linear gear profile of the gear and contacted with the gear face when in working; a symmetrical trapezoid groove is arranged at the root of the gear tooth part, and two lateral faces of the trapezoid groove are not contacted with the gear tooth face when in working. The invention has the advantages of effectively increasing the output volume of the gear pump and simultaneously reducing oil entrapping phenomenon and improving the working stability.
Description
Technical field
The invention belongs to the hydraulic equipment technical field, be specifically related to a kind of straight-tooth conjugate crescent seal gear pump.
Background technique
That crescent gear pump has is simple and compact for structure, volume is little, long working life, cost is low, self-priming performance good, to advantages such as the hydraulic oil microimpurity are insensitive, in hydraulic system, obtained using widely.
Crescent gear pump is by the very little internal gear pair engagement driving of a pair of number of teeth difference, and separates the purpose that reaches pump oil by means of swing link.The profile of tooth of inside engaged gear is mainly involute at present, is characterized in that technology capability is good, and required precision is low, but involute crescent gear pump entrap phenomenon is more serious, and the operation noise is bigger, and delivery pressure is not high yet.Hydraulic transmission to high pressure, at a high speed, when high-power direction develops, it is more and more outstanding that noise problem also seems, in order to reduce the noise of hydraulic system when increasing work efficiency, straight-tooth conjugate crescent seal gear pump has obtained development rapidly in recent years.
Straight-tooth conjugate crescent seal gear pump adopts the internal gear pair of a pair of special tooth profile, and its middle gear is a straight-side profile, and gear ring is its conjugate profiles.Because the particularity of its engagement process, the running noise and the flow pulsation of this pump are little, it is simple both to have had general gear pump structure, the advantage little to medium pollution receptance, have the high pressure of plunger pump and the low noise of screw pump, long-life advantage again, characteristics are that delivery pressure height, simple in structure, pressure pulsation and noise are little, are called " quiet pump " in the industry.
The discharge capacity of crescent gear pump is directly proportional with the height of the gear teeth, and the height increase of the gear teeth can make the gear pair overlap coefficient increase simultaneously, forms the pocketed oil district of sealing when two pairs of gear teeth mesh simultaneously, along with rotatablely moving of gear, change from small to big from large to small again in this pocketed oil district.And the compressibility of oil is very little, and when pocketed oil district volume diminished, the liquid that is enclosed in wherein was subjected to squeeze the generation high pressure, and therefore the radial load of gear sharply increases, and causes vibration and noise; And pocketed oil district volume is when becoming big, cause parital vacuum again, cause phenomenons such as Cavitation Noise, can make system's unstability when serious, in the straight-tooth conjugate crescent seal gear pump of prior art (CN2711413Y2005 announced July 20), in order to control entrap phenomenon, the overlap coefficient of gear engagement is all smaller, the height of the gear teeth is restricted, thereby has influenced the raising of gear pump discharge capacity, sees Fig. 3.
Summary of the invention
Purpose of the present invention is exactly to improve straight-tooth conjugate crescent seal gear pump and improve contradiction between the vibrating noise that discharge capacity and control pocketed oil bring in order to solve, and provides a kind of pocketed oil of effectively avoiding to aggravate, and can increase the straight-tooth conjugate crescent seal gear pump structure of discharge capacity again.
The objective of the invention is by providing a kind of straight-tooth conjugate crescent seal gear pump to realize with following structure, this straight-tooth conjugate crescent seal gear pump mainly comprises the pump housing of being with endoporus, the a pair of internal gear pair that can freely rotate in endoporus is fixed in the swing link of external gear in separating on the pump housing and the parts such as live axle that actuation gear rotates.As shown in Figure 1, gear ring 1 and gear 2 constitutes internal gear pairs, and the working flank flank profil of gear is a straight line, and gear ring is the curve of conjugation with it.Two-wheeled off-centre is installed on the pump housing.Name a person for a particular job oil sucting cavity and pumping cavity of swing link 3 between gear and the ring gear and gear engagement separates, form two independently enclosed spaces, when the transmission of live axle driven gear, the volume of two enclosed spaces changes, constantly bring hydraulic oil into pumping cavity, realize the function of pump oil from oil sucting cavity.
Compare with the prior art among Fig. 2, key of the present invention is by increasing the tooth depth of gear 2, to improve the gear pump delivery, compared with prior art, the present invention is under the condition that does not change the pump structure size, the tooth depth of gear can be increased by 10%～15%, the corresponding raising 15%～20% of gear pump delivery.
In order to adapt to the variation of gear parameter height, the present invention has changed the root profile of tooth of gear ring simultaneously, designs a symmetrical trapezoid groove structure that can hold gear teeth tips.In order to guarantee the intensity of tooth root, the angle of dovetail groove bi-side is 20～30 °, between groove side and the bottom surface transition arc is arranged.Keep certain interval with the bottom surface of time slot and the tooth top of gear, to satisfy the back lash requirement of increasing backgear tooth top place.Owing to do not participate in engagement during the work of gear ring dovetail groove part flank profil, therefore can not increase the overlap coefficient of gear pair engagement, the variable quantity of pocketed oil district volume size can not increase yet.But in engagement process, the trapezoid groove structure at the bottom of the gear ring tooth has strengthened the absolute volume in pocketed oil district, therefore when pocketed oil district volume changes, can suppress the acute variation of pressure on the contrary effectively, reduces running noise.
When the number of teeth of gear was too much, tooth top came to a point easily, so the number of teeth of middle gear of the present invention is 8～12, and addendum width is 0.08～0.1 with the ratio of top circle tooth pitch simultaneously, with the width that guarantees tooth top to satisfy the requirement that the swing link place seals.In addition, the number of teeth difference of interior external gear of the present invention is greater than 3, and number of teeth difference is too little, can cause meshing interference, reduces the length of swing link sealing surface simultaneously, influences sealing effect.
Description of drawings
Fig. 1 is a gear teeth structural drawing of the present invention.
Fig. 2 is a kind of gear teeth structural drawing of prior art.
Fig. 3 is a straight-tooth conjugate crescent seal gear pump overall construction drawing of the present invention.
Fig. 4 is a straight-tooth conjugate crescent seal gear pump structure sectional view of the present invention.
Piece mark among the figure: 1-gear ring, 2-gear, 3-key, 4-live axle, 5-swing link, 6-bolt, 7-bearing cap, 8-seal ring, 9-screw, the pump housing before the 10-rolling bearing, 11-, the pump housing in the middle of the 12-sliding bearing sleeve, 13-, 14-sliding bearing sleeve, the pump housing behind the 15-
Embodiment
The invention will be further described below in conjunction with accompanying drawing embodiment.
Fig. 3,4 have represented a straight-tooth conjugate crescent seal gear pump mode of execution of the present invention.Gear 2 connects with live axle 4 by key 3, rotates under motor drives.Live axle 4 is bearing on the pump housing by rolling bearing 10 and sliding bearing sleeve 12,13, and the pump housing is connected by bolt 6 by the preceding pump housing 11, the middle pump housing 13 and the back pump housing 15 and forms.Endoporus in the middle of gear ring 1 is arranged on the pump housing, and and gear engagement.Swing link 5 is divided between the gear teeth of gear ring at gear, plays a part to separate oil suction district and laminated oil zone.Have the little oilhole that lubricating bearings is used on the preceding pump housing, and seal ring 8 is installed in case stopping leak leaks at the external part of axle, seal ring is fixing by bearing cap 7 and screw 9.When gear pump was worked, the filler opening on hydraulic oil the past pump housing flowed into, and enters oil sucting cavity, and along with the rotation of gear is brought into pumping cavity, discharges from oil outlet by the oil duct on the pump housing at last.
At straight-tooth conjugate crescent seal gear pump oil outlet input high pressure oil of the present invention, then can on live axle, realize certain rotating speed and torque output, realize the function of oil motor.
Claims (3)
1. straight-tooth conjugate crescent seal gear pump, it comprises the pump housing of being with endoporus, and a pair of internal gear pair that can freely rotate in endoporus is fixed in the swing link of external gear in separating on the pump housing and the parts such as live axle that actuation gear rotates.It is characterized in that: the tooth curve of gear is a straight line, and its gear height is greater than reality engagement height, and the ratio of addendum width and top circle tooth pitch is 0.08～0.1.
2. straight-tooth conjugate crescent seal gear pump as claimed in claim 1 is characterized in that: the flank profil of gear ring is divided into two-part, and the wheel toothed portion is the work flank profil, and the straight-side profile conjugation with gear contacts with gear teeth face during work; Tooth root partly is a symmetrical dovetail groove, and the angle of dovetail groove bi-side is 20～30 °, and bi-side do not contact with gear teeth face when work.
3. as claim 1,2 described straight-tooth conjugate crescent seal gear pumps, it is characterized in that: the number of teeth of gear is 8～12, and the number of teeth difference of interior external gear is greater than 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910047421A CN101832263A (en) | 2009-03-12 | 2009-03-12 | Straight-tooth conjugate crescent seal gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910047421A CN101832263A (en) | 2009-03-12 | 2009-03-12 | Straight-tooth conjugate crescent seal gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101832263A true CN101832263A (en) | 2010-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910047421A Pending CN101832263A (en) | 2009-03-12 | 2009-03-12 | Straight-tooth conjugate crescent seal gear pump |
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| CN (1) | CN101832263A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102022319A (en) * | 2010-12-02 | 2011-04-20 | 湖南机油泵股份有限公司 | Oil pump with inside engaged gear |
| CN102135093A (en) * | 2011-04-13 | 2011-07-27 | 姜卫东 | Linear conjugate internal gearing gear pump |
-
2009
- 2009-03-12 CN CN200910047421A patent/CN101832263A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102022319A (en) * | 2010-12-02 | 2011-04-20 | 湖南机油泵股份有限公司 | Oil pump with inside engaged gear |
| CN102135093A (en) * | 2011-04-13 | 2011-07-27 | 姜卫东 | Linear conjugate internal gearing gear pump |
| CN102135093B (en) * | 2011-04-13 | 2012-12-26 | 姜卫东 | Linear conjugate internal gearing gear pump |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100915 |