CN104895781A - Internal gear pump - Google Patents
Internal gear pump Download PDFInfo
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- CN104895781A CN104895781A CN201410473912.0A CN201410473912A CN104895781A CN 104895781 A CN104895781 A CN 104895781A CN 201410473912 A CN201410473912 A CN 201410473912A CN 104895781 A CN104895781 A CN 104895781A
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- gear
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- drainage trough
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Abstract
The invention discloses an internal gear pump, and relates to the technical field of gear pumps. The internal gear pump comprises a pump body, an internal tooth ring and an external gear, wherein mounting grooves with the same size are formed in all wheel teeth of the internal tooth ring from the tooth tops in the radial direction; inclined surfaces are arranged at the bottoms of the mounting grooves; radial compensation blocks are mounted in the mounting grooves; blind holes are formed in the middles of the radial compensation blocks; springs are arranged in the blind holes; the other end surfaces of the springs are pressed on the bottoms of the mounting grooves; in the pump body, floating side plates are respectively arranged on two end surfaces of a gear pair; a drainage groove 1 and a drainage groove 2 are formed in the planes, near the end surface of the gear pair, of the floating side plates; and the drainage grooves are distributed in starting and ending positions of an oil pressing area in a non-engagement area formed by the internal tooth ring, the external gear and the radial compensation blocks. The internal gear pump uses the compensation blocks capable of moving in the radial direction for sealing, so that the volume efficiency of the internal gear pump can be effectively improved, the volume of the pump body is decreased, the gear side gap precision is reduced, the tooth surface abrasion condition is relieved, the service life of the gear pump is prolonged, and the noise level of the gear pump is prominently improved.
Description
Technical field
The present invention relates to gear pump technical field, specifically a kind of crescent gear pump for fluid pressure motor.
Background technique
At present, conventional crescent gear pump generally includes the pump housing and the external gear be located in the pump housing and internal gear, and external gear and internal gear are near being meshed, and another side is then separated by swing link.Non-mesh regional between external gear and internal gear is divided into two spaces by swing link, and the space of two gear drop out of gears is oil suction districts, and the space of trend engagement is laminated oil zone.External gear is generally connected with transmission shaft or makes one, and by drive unit driven rotary.When inside engaged gear pump work, external gear High Rotation Speed also drives internal gear to rotate, in the process of external gear and internal gear transmission, the oil suction district tight Container Volume of Methane of two gear drop out of gears increases, form negative pressure, suck fluid from the filler opening the pump housing, and the laminated oil zone tight Container Volume of Methane of two tooth trend engagements reduces, and is extruded by fluid from the oil outlet the pump housing.
But current above-mentioned crescent gear pump, mainly also there is following problems: the inside and outside gear of gear pump in engagement driving process main rely on gear pair back lash and tooth top and swing link gap to realize the seal isolation in oil suction district and laminated oil zone, for the crescent gear pump that will realize mesohigh and even ultrahigh pressure level, the component such as the high-accuracy gear of manufacturing and swing link meet the design in high pressure gap, add difficulty of processing and the cost of production of component undoubtedly simultaneously; Equally in the fretting wear of transmission process gear joint, greatly limit also creating the working life of oil hydraulic pump; Use swing link to isolate the design in high and low pressure chamber on the other hand, obviously reduce the cavity volume of non-mesh regional between inside and outside gear, concerning the gear pump of equal discharge capacity, increase pump body structure shape.
Summary of the invention
For overcoming the deficiencies in the prior art, goal of the invention of the present invention is to provide a kind of crescent gear pump, the sealing configuration that the high and low pressure chamber in the past relying on gear pair flank engagement gap and tooth top and swing link gap to realize by change isolates, eliminate the wearing and tearing because of the flank of tooth in meshed transmission gear process, on the hydraulic performance of crescent gear pump and the impact in working life, realize the advantage that equal displacement gear pump has more small volume structure and more low noise level simultaneously.
For achieving the above object, the present invention includes the pump housing and be located in the pump housing near the ring gear be meshed and external gear; Ring gear and external gear composition gear pair, pass through external gear driving; The eccentric inner hole of ring gear external cylindrical surface and the pump housing forms rotary pair; It is characterized in that: on each gear teeth of ring gear, radially have the mounting groove of formed objects from tooth top, with an inclined-plane bottom mounting groove, be equipped with in mounting groove and can radially move and by the spacing radial compensation block in inclined-plane; Have blind hole in the middle part of radial compensation block, be provided with spring in blind hole, the other end of spring is pressed in the bottom of mounting groove; In the pump housing, the both ends of the surface of gear pair are respectively provided with a floating side plate, in the plane of gear pair end face, offer drainage trough one and drainage trough two at floating side plate, drainage trough one and drainage trough two are distributed on the starting and ending position of the laminated oil zone in the non-mesh regional that ring gear and external gear and radial compensation block formed.
The profile of tooth of the gear pair that described ring gear and external gear form is that involute repaiies the type gear teeth, and it is near being meshed in the pump housing, and another side is without Tooth Shape Interference; The tooth top of external gear and tooth groove root are arc surface shape, and the tooth top of ring gear is plane shape feature.
Described drainage trough, in the initial position of laminated oil zone, has five kidney slots becoming equal angular extent; Drainage trough, at the end position of laminated oil zone, has three along the irregular kidney slot of center of circle distribution.
The stroke gap that can form cavity structure is had bottom described mounting groove and between the bottom of radial compensation block.
In gear pair engagement High Rotation Speed, high pressure oil in laminated oil zone is periodically progressively incorporated in the cavity that ring gear mounting groove and radial compensation block formed by drainage trough one and drainage trough two, oil pressure is formed in the bottom of radial compensation block, radial compensation block relies on the elastic force of spring and the oil pressure in radial compensation block portion, support on its top circle cambered surface acting on external gear and tooth groove root arc surface, form contact sealing configuration in the starting and ending position of laminated oil zone simultaneously, non-mesh regional in ring gear and external gear is divided into high-voltage oil cavity and low pressure oil pocket, in the process of external gear and ring gear transmission, the oil suction district tight Container Volume of Methane of two gear drop out of gears increases, form negative pressure, fluid is sucked from the filler opening the pump housing, the laminated oil zone tight Container Volume of Methane of two tooth trend engagements reduces, fluid is extruded from the oil outlet the pump housing.
The present invention compared with prior art, because spring force and oil pressure are all soft supporting power, have flexible compensation function and damping behavior, therefore the contact wear that radial compensation block and gear produce does not affect sealing gear pump performance, soft supporting effectively can also reduce noise level simultaneously.Carry-over moment effect is only played in gear pair engagement, do not participate in flank of tooth sealing, thus reduce further precision and the difficulty of Gear Processing, effectively improve stability characteristic (quality) and the working life of crescent gear pump, be embedded in owing to devising radial compensation block structure ring gear being done radial motion simultaneously, dramatically saves on inside and outside gear and form non-mesh regional space, improve the volumetric efficiency of gear pump, reduce the volume of the pump housing.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the I-I enlarged view of Fig. 1.
Embodiment
As shown in Figure 1 and Figure 2, the present invention includes the pump housing 1 and be located in the pump housing 1 near while the ring gear 2 that is meshed and external gear 3 gear pair, by external gear 3 transmission, the eccentric inner hole of ring gear 2 external cylindrical surface and the pump housing 1 forms spin friction pair, the profile of tooth of the gear pair that described ring gear 2 and external gear 3 form is that involute repaiies the type gear teeth, it is close while be meshed in the pump housing 1, and another side is without Tooth Shape Interference.The tooth top of external gear 3 and tooth groove root are arc surface shape, and the tooth top of ring gear 2 is plane shape feature; On each gear teeth of ring gear 2, radially have the mounting groove of formed objects from tooth top, with an inclined-plane 7 bottom mounting groove, be equipped with in mounting groove and can radially move and by the spacing radial compensation block 4 in inclined-plane 7; Have blind hole in the middle part of radial compensation block 4, be provided with spring 5 in blind hole, have the stroke gap that can form cavity structure bottom described mounting groove and between the bottom of radial compensation block 4, the other end of spring 5 is pressed in the bottom of mounting groove.In the pump housing 1, the both ends of the surface of gear pair are respectively provided with a floating side plate 6, in the plane of gear pair end face, drainage trough one a and drainage trough two b is offered at floating side plate 6, drainage trough one a and drainage trough two b is distributed on the starting and ending position of the laminated oil zone B in the non-mesh regional that ring gear 2 and external gear 3 and radial compensation block 4 formed, described drainage trough a is in an initial position of laminated oil zone B, there are five kidney slots becoming equal angular extent, drainage trough b is at the end position of laminated oil zone B, there are three along the irregular kidney slot of center of circle distribution, but it is not limited only to sample shown in figure, all drainage troughs realizing above-mentioned " high pressure oil in the B of laminated oil zone being incorporated into the bottom cavity of equally distributed radial compensation block 4 on ring gear 2 " function, be all interest field.
In gear pair engagement High Rotation Speed, high pressure oil in the B of laminated oil zone is periodically progressively incorporated in the cavity that ring gear 2 mounting groove and radial compensation block 4 formed by drainage trough one a and drainage trough two b, oil pressure is formed in the bottom of radial compensation block 4, radial compensation block 4 relies on the oil pressure bottom the elastic force of spring 5 and radial compensation block 4, support on its top circle cambered surface acting on external gear 3 and tooth groove root arc surface, form contact sealing configuration in the starting and ending position of laminated oil zone B simultaneously, non-mesh regional in ring gear 2 and external gear 3 is divided into high-voltage oil cavity and low pressure oil pocket, at external gear 3 with the process of ring gear 2 transmission, the oil suction district S tight Container Volume of Methane of two gear drop out of gears increases, form negative pressure, fluid is sucked from the filler opening the pump housing, the laminated oil zone B tight Container Volume of Methane of two tooth trend engagements reduces, fluid is extruded from the oil outlet the pump housing.
Above-described embodiment only for technical conceive of the present invention and feature are described, can not limit the scope of the invention with this.All equivalent transformations done according to the essence of main technical schemes of the present invention, all should be encompassed within protection scope of the present invention.
Claims (4)
1. a crescent gear pump, comprises the pump housing (1) and is located in the pump housing (1) near the ring gear (2) be meshed and external gear (3); Ring gear (2) and external gear (3) composition gear pair, by external gear (3) transmission; The eccentric inner hole of ring gear (2) external cylindrical surface and the pump housing (1) forms rotary pair; It is characterized in that: on each gear teeth of ring gear (2), the mounting groove of formed objects is radially had from tooth top, with an inclined-plane (7) bottom mounting groove, be equipped with in mounting groove and can radially move and by inclined-plane (7) spacing radial compensation block (4); Radial compensation block (4) middle part has blind hole, and be provided with spring (5) in blind hole, the other end of spring (5) is pressed in the bottom of mounting groove; In the pump housing (1), the both ends of the surface of gear pair are respectively provided with a floating side plate (6), in the plane of gear pair end face, offer drainage trough one (a) and drainage trough two (b) at floating side plate (6), drainage trough one (a) and drainage trough two (b) are distributed on the starting and ending position of the laminated oil zone (B) in the non-mesh regional that ring gear (2) and external gear (3) and radial compensation block (4) formed.
2. a kind of crescent gear pump according to claim 1, it is characterized in that: the profile of tooth of the gear pair that described ring gear (2) and external gear (3) form is that involute repaiies the type gear teeth, it is close while be meshed in the pump housing (1), and another side is without Tooth Shape Interference; Tooth top and the tooth groove root of external gear (3) are arc surface shape, and the tooth top of ring gear (2) is plane shape feature.
3. a kind of crescent gear pump according to claim 1, is characterized in that: described drainage trough (a), in the initial position of laminated oil zone (B), has five kidney slots becoming equal angular extent; Drainage trough (b), at the end position of laminated oil zone (B), has three along the irregular kidney slot of center of circle distribution.
4. a kind of crescent gear pump according to claim 1, is characterized in that: bottom described mounting groove and have the stroke gap that can form cavity structure between the bottom of radial compensation block (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410473912.0A CN104895781A (en) | 2014-09-17 | 2014-09-17 | Internal gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410473912.0A CN104895781A (en) | 2014-09-17 | 2014-09-17 | Internal gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104895781A true CN104895781A (en) | 2015-09-09 |
Family
ID=54028667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410473912.0A Pending CN104895781A (en) | 2014-09-17 | 2014-09-17 | Internal gear pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104895781A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006912A (en) * | 2015-08-10 | 2015-10-28 | 重庆长戈动力科技有限公司 | Planetary gear deceleration integrated motor |
| CN108006167A (en) * | 2017-12-31 | 2018-05-08 | 无锡凯涵科技有限公司 | A kind of intelligent robot reducer structure |
| CN110761998A (en) * | 2019-11-12 | 2020-02-07 | 徐州乐泰机电科技有限公司 | Internal shrinkage type isolation compensation type gear pump based on hydraulic system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5399079A (en) * | 1991-12-06 | 1995-03-21 | J. M. Voith Gmbh | Sickleless internal gear pump with sealing elements inserted in the tooth heads |
| JPH0783175A (en) * | 1993-09-16 | 1995-03-28 | Hitachi Ltd | Internal gear pump |
| US5540573A (en) * | 1993-12-17 | 1996-07-30 | J.M. Voith Gmbh | Sickleless internal gear pump having sealing elements in tooth heads |
| US5582514A (en) * | 1994-06-08 | 1996-12-10 | J. M. Voith Gmbh | Sickleless internal gear pump |
| EP0845596A1 (en) * | 1996-11-27 | 1998-06-03 | Voith Turbo GmbH | Internal gear pump with empty crescent space and spring biased sealing blades inserted in the teeth heads |
| EP0911524A1 (en) * | 1997-10-23 | 1999-04-28 | Robert Bosch Gmbh | Internal gear pump |
| CN204126883U (en) * | 2014-09-17 | 2015-01-28 | 襄阳博亚精工装备股份有限公司 | A kind of crescent gear pump |
-
2014
- 2014-09-17 CN CN201410473912.0A patent/CN104895781A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5399079A (en) * | 1991-12-06 | 1995-03-21 | J. M. Voith Gmbh | Sickleless internal gear pump with sealing elements inserted in the tooth heads |
| JPH0783175A (en) * | 1993-09-16 | 1995-03-28 | Hitachi Ltd | Internal gear pump |
| US5540573A (en) * | 1993-12-17 | 1996-07-30 | J.M. Voith Gmbh | Sickleless internal gear pump having sealing elements in tooth heads |
| US5582514A (en) * | 1994-06-08 | 1996-12-10 | J. M. Voith Gmbh | Sickleless internal gear pump |
| EP0845596A1 (en) * | 1996-11-27 | 1998-06-03 | Voith Turbo GmbH | Internal gear pump with empty crescent space and spring biased sealing blades inserted in the teeth heads |
| EP0911524A1 (en) * | 1997-10-23 | 1999-04-28 | Robert Bosch Gmbh | Internal gear pump |
| CN204126883U (en) * | 2014-09-17 | 2015-01-28 | 襄阳博亚精工装备股份有限公司 | A kind of crescent gear pump |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006912A (en) * | 2015-08-10 | 2015-10-28 | 重庆长戈动力科技有限公司 | Planetary gear deceleration integrated motor |
| CN105006912B (en) * | 2015-08-10 | 2018-04-13 | 重庆长戈动力科技有限公司 | Planetary gear speed-reduction integrated electric motor |
| CN108006167A (en) * | 2017-12-31 | 2018-05-08 | 无锡凯涵科技有限公司 | A kind of intelligent robot reducer structure |
| CN110761998A (en) * | 2019-11-12 | 2020-02-07 | 徐州乐泰机电科技有限公司 | Internal shrinkage type isolation compensation type gear pump based on hydraulic system |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150909 |