CN211343328U - Internal gear pump - Google Patents
Internal gear pump Download PDFInfo
- Publication number
- CN211343328U CN211343328U CN201922304367.3U CN201922304367U CN211343328U CN 211343328 U CN211343328 U CN 211343328U CN 201922304367 U CN201922304367 U CN 201922304367U CN 211343328 U CN211343328 U CN 211343328U
- Authority
- CN
- China
- Prior art keywords
- oil
- gear
- groove
- shaft
- external gear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Rotary Pumps (AREA)
Abstract
The utility model discloses an internal gear pump, wherein a plurality of oil storage grooves are arranged on two sides of an external gear; and at least one oil storage groove on each side is communicated with the high-pressure oil cavity through the oil guide groove and the damping groove on the side plate in the running process of the outer gear shaft. According to the technical scheme, the high-pressure hydraulic oil forms a dynamic pressure oil film between the outer gear and the side plate through the pressure relief of the oil storage tank, so that the lubrication between the outer gear and the side plate is improved, the abrasion is reduced, and the service life of the side plate is prolonged; because the bearing is provided with the rectangular oil groove communicated with the high-pressure oil cavity, and the rectangular oil groove, the external gear shaft and the inner gear ring are meshed at the opposite two sides of the external gear shaft, the unilateral abrasion of the external gear shaft on the bearing supporting the shaft can be eliminated, the service life of the bearing can be greatly prolonged, and the stability of the oil outlet efficiency of the internal gear pump can be improved.
Description
Technical Field
The utility model relates to a hydraulic gear pump especially relates to a hydraulic gear pump of inner gearing mode.
Background
The gear pump is a hydraulic pump widely used in a hydraulic system and can be divided into an external gear pump and an internal gear pump. Internal gear pumps are commonly used in the industries of petroleum, chemical, paint, dye, food, grease, medicine, etc. The internal gear pump adopts the principle of internal gear engagement, the external gear shaft and the pitch circle of the internal gear ring are close to one side, the other side is separated by the crescent block, and three pressure areas are formed along the circumference, namely a low-pressure area corresponding to the oil suction port, a high-pressure area corresponding to the oil discharge port and a pressure transition area where the crescent block is located. The crescent block is used for dividing a high-pressure area and a low-pressure area, and simultaneously, the crescent block is contacted with an elongated belt with tooth tops between an inner gear and an outer gear to form a seal, so that the contact of a certain number of teeth is required to form a sufficiently long sealing length.
In order to improve the oil outlet efficiency, a relatively sealed space needs to be formed in a high-pressure area of the internal gear pump, so that high-pressure oil in the high-pressure area is prevented from leaking to a low-pressure area, the gap between the external gear shaft and the side plates on the two sides of the external gear shaft is extremely small, and the formation of a dynamic pressure oil film is not facilitated, so that the lubrication condition between the external gear shaft and the side plates on the two sides of the external gear shaft is not very ideal, and the service life of the side plates cannot achieve the expected effect; in addition, because the external gear shaft and the inner gear ring are meshed in a unilateral manner, the external gear shaft inevitably receives unilateral radial force, so that the sliding bearing for supporting the external gear shaft can receive unidirectional force, the sliding bearing is worn in a unilateral manner after a long time, the service life of the sliding bearing is influenced, meanwhile, the meshing condition between the external gear shaft and the inner gear ring is deteriorated, and the oil outlet efficiency of the gear pump is lower and lower along with the increase of the fit clearance between the external gear shaft and the inner gear ring.
Disclosure of Invention
An object of the utility model is to provide a can improve the lubricated condition between external tooth axle and the curb plate, reducing wear to extension curb plate life's crescent gear pump.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
an internal gear pump comprises a pump body, an inner gear ring arranged in the pump body, an outer gear shaft meshed with the inner gear ring, crescent blocks positioned between a low-pressure oil cavity and a high-pressure oil cavity, and side plates which are arranged on two sides of the pump body, form lubrication sealing with the outer gear shaft and the inner gear ring and distribute oil; the external gear shaft comprises a shaft and an external gear, and a plurality of oil storage grooves positioned on the end surface of the gear side are arranged on two sides of the external gear; and at least one oil storage groove on each side is communicated with the high-pressure oil cavity through the oil guide groove and the damping groove on the side plate in the running process of the outer gear shaft. Because the outer gear is provided with the oil storage groove on the gear side end face, the oil storage groove can be communicated with the high-pressure oil cavity when the outer gear rotates, when the oil storage groove on the outer gear passes through the high-pressure oil cavity, high-pressure hydraulic oil can enter the oil storage groove, when the oil storage groove on the outer gear rotates to a low-pressure area, the high-pressure hydraulic oil can be discharged outwards from the oil storage groove, and the discharged high-pressure hydraulic oil can form a dynamic pressure oil film between the outer gear and the side plate under the driving of the high-speed rotating outer gear shaft, so that the lubricating state between the outer gear and the side plate is improved, the abrasion is reduced, and the service life of the side plate is prolonged.
Preferably, the oil sump is spaced according to the number of teeth. Because hydraulic oil has certain viscidity, can not disappear immediately in the short time after forming the dynamic pressure oil film, so need not set up the oil storage groove on every teeth of a cogwheel to reduce work load, reduce manufacturing cost.
Preferably, the oil sumps on both sides of the external gear are disposed to be offset from each other. The transmission stability of the internal gear pump is facilitated, and therefore the working noise of the internal gear pump is reduced.
Preferably, the oil storage groove is a circular blind hole. The blind holes are the least expensive to manufacture in a circular shape to reduce manufacturing costs.
Preferably, a bearing for supporting the shaft is further provided with a rectangular oil groove, and the rectangular oil groove is communicated with the high-pressure oil chamber. The rectangular oil groove, the meshing positions of the external gear shaft and the inner gear ring are arranged on two opposite sides of the external gear shaft, so that high-pressure hydraulic oil in the rectangular oil groove can generate a supporting force on the external gear shaft, the supporting force is equal to the meshing force of the external gear shaft and the inner gear ring in magnitude and opposite in direction, and single-side abrasion of a bearing supporting the shaft by the external gear shaft can be eliminated, so that the service life of the bearing can be greatly prolonged, and the stability of the oil outlet efficiency of the internal gear pump can be improved.
The utility model has the advantages that: because the oil storage grooves are arranged on the end surfaces of the two sides of the external gear and are communicated with the high-pressure oil cavity through the oil guide grooves and the damping grooves on the side plates, the high-pressure hydraulic oil is decompressed through the oil storage grooves to form a dynamic pressure oil film between the external gear and the side plates, so that the lubrication state between the external gear and the side plates is improved, the abrasion is reduced, and the service life of the side plates is prolonged; the rectangular oil grooves communicated with the high-pressure oil cavities are formed in the bearing, and the meshing positions of the rectangular oil grooves, the external gear shaft and the internal gear ring are arranged on the two opposite sides of the external gear shaft, so that a supporting force is generated on the external gear shaft by high-pressure hydraulic oil in the rectangular oil grooves, the supporting force is equal to the meshing force of the external gear shaft and the internal gear ring in magnitude and opposite in direction, and the unilateral abrasion of the external gear shaft on the bearing supporting the shaft can be eliminated, so that the service life of the bearing can be greatly prolonged, and the stability of the oil outlet efficiency of the internal gear pump can be improved.
Drawings
FIG. 1 is a schematic structural view of an oil storage tank according to the present invention;
FIG. 2 is a schematic structural view of the outer gear shaft and the side plate of the present invention;
FIG. 3 is a schematic structural view of the rectangular oil groove of the present invention;
FIG. 4 is an enlarged view at H in FIG. 3;
FIG. 5 is a schematic view of the rectangular oil groove cut away from another angle of the present invention;
FIG. 6 is an enlarged view at M in FIG. 5;
the oil pump comprises a pump body 1, an oil discharge port 2, an external gear shaft 3, a high-pressure oil cavity 4, an external gear 5, a blind hole 6, a crescent block 7, a shaft 8, an internal gear ring 9, a low-pressure oil cavity 10, a pump cavity 11, an oil suction port 12, an oil guide groove 13, a side plate 14, a damping groove 15, a bearing 16, a rectangular oil groove 17 and an oil guide hole 18.
Detailed Description
The technical scheme of the present invention is further specifically described by the following specific embodiments in combination with the drawings of the specification:
example (b): an internal gear pump is shown in figures 1 and 2, and comprises a hollow pump body 1, an oil suction port 12 and an oil discharge port 2 are arranged on the pump body 1, a rotatable inner gear ring 9 is arranged in a pump cavity 11 of the pump body 1, an outer gear shaft 3 meshed with the inner gear ring 9 is arranged in the inner gear ring 9, the axial center of the outer gear shaft 3 is offset towards one side of an oil discharge port 2 of the pump body 1 relative to the axial center of the inner gear ring 9, a crescent block 7 fixedly connected with the pump body 1 is arranged on the outer side of the meshing side of the outer gear shaft 3 and the inner gear ring 9, the pump cavity 11 is divided into a low-pressure oil cavity 10 and a high-pressure oil cavity 4 by the crescent block 7, the external gear shaft 3 comprises a shaft 8 and an external gear 5, side plates 14 which can be used for oil distribution and form lubrication sealing with the external gear shaft 3 and the internal gear ring 9 are respectively arranged on two sides of the external gear 5 and the internal gear ring 9 in a pump cavity 11 of the pump body 1, and a plurality of blind holes 6 positioned on the end surfaces of the gear sides are arranged on two sides of the external gear 5; at least one blind hole 6 on each side is communicated with the high-pressure oil chamber 4 through an oil guide groove 13 and a damping groove 15 on the side plate 14 during the operation of the external gear shaft 3.
As a further technical solution, the number of the teeth of the external gear 5 is 12, so that the number of the blind holes 6 arranged on the tooth side end surface of the external gear 5 is 3 per side surface, the two side surfaces are 6 in total, the 3 blind holes 6 on the same side surface are arranged at equal intervals, and the blind holes 6 on the two sides of the split external gear 5 are arranged in a staggered manner.
As shown in fig. 3, 4, 5 and 6, the shafts 8 on both sides of the external gear 5 are respectively sleeved with bearings 16, the bearings 16 are sliding bearings, a rectangular oil groove 17 extending in an arc shape along the circumferential direction of the inner side wall and extending in an axial straight line is arranged on the inner side wall of each bearing 16, the rectangular oil groove 17 is communicated with the high-pressure oil chamber 4 through an oil guide hole 18, and the rectangular oil groove 17 and the high-pressure oil chamber 4 are respectively arranged on both sides of the shafts 8.
The above-described embodiments are merely preferred embodiments of the present invention, which are not intended to limit the present invention in any way, and other variations and modifications are possible without departing from the scope of the invention as set forth in the appended claims.
Details not described in the present specification belong to the prior art known to those skilled in the art.
Claims (6)
1. An internal gear pump comprises a pump body, an inner gear ring arranged in the pump body, an outer gear shaft meshed with the inner gear ring, crescent blocks positioned between a low-pressure oil cavity and a high-pressure oil cavity, and side plates which are arranged on two sides of the pump body, form lubrication sealing with the outer gear shaft and the inner gear ring and distribute oil; the method is characterized in that: the external gear shaft comprises a shaft and an external gear, and a plurality of oil storage grooves positioned on the end surface of the gear side are arranged on two sides of the external gear; and at least one oil storage groove on each side is communicated with the high-pressure oil cavity through the oil guide groove and the damping groove on the side plate in the running process of the outer gear shaft.
2. A crescent gear pump according to claim 1, wherein: the oil storage tanks are arranged at intervals according to the number of teeth.
3. A crescent gear pump according to claim 2, wherein: the oil storage grooves on both sides of the outer gear are arranged in a staggered manner.
4. A crescent gear pump according to any of claims 1-3, wherein: the oil storage groove is a round blind hole.
5. A crescent gear pump according to any of claims 1-3, wherein: and a bearing for supporting the shaft is also provided with a rectangular oil groove, and the rectangular oil groove is communicated with the high-pressure oil cavity.
6. A crescent gear pump according to claim 4, wherein: and a bearing for supporting the shaft is also provided with a rectangular oil groove, and the rectangular oil groove is communicated with the high-pressure oil cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922304367.3U CN211343328U (en) | 2019-12-20 | 2019-12-20 | Internal gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922304367.3U CN211343328U (en) | 2019-12-20 | 2019-12-20 | Internal gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211343328U true CN211343328U (en) | 2020-08-25 |
Family
ID=72137228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922304367.3U Active CN211343328U (en) | 2019-12-20 | 2019-12-20 | Internal gear pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211343328U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112814895A (en) * | 2021-02-07 | 2021-05-18 | 上海涌憬液压机械有限公司 | Take bimetallic bearing's crescent gear pump |
| CN114215742A (en) * | 2021-11-10 | 2022-03-22 | 浙江环誉泵业科技有限公司 | Low-leakage dynamic pressure fluid sealing end face structure with self-circulation backflow function |
| CN114320880A (en) * | 2021-11-10 | 2022-04-12 | 浙江环誉泵业科技有限公司 | Gear end face communication backflow groove with self-lubricating and self-cooling functions |
-
2019
- 2019-12-20 CN CN201922304367.3U patent/CN211343328U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112814895A (en) * | 2021-02-07 | 2021-05-18 | 上海涌憬液压机械有限公司 | Take bimetallic bearing's crescent gear pump |
| CN114215742A (en) * | 2021-11-10 | 2022-03-22 | 浙江环誉泵业科技有限公司 | Low-leakage dynamic pressure fluid sealing end face structure with self-circulation backflow function |
| CN114320880A (en) * | 2021-11-10 | 2022-04-12 | 浙江环誉泵业科技有限公司 | Gear end face communication backflow groove with self-lubricating and self-cooling functions |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211343328U (en) | Internal gear pump | |
| CN1179129C (en) | Toothed rotor set | |
| CN102588722B (en) | Reversible gerotor pump | |
| US20170175736A1 (en) | Gear pump with end plates or bearings having spiral grooves | |
| CN108291537B (en) | External gear pump | |
| CN211598988U (en) | Melt gear pump | |
| KR101455279B1 (en) | Trochoidal-pressure pump for feeding the high-viscosity liquid | |
| US20160047462A1 (en) | Gear Wheel with Meshing Teeth | |
| CN100476210C (en) | internal gear rotary pump or motor | |
| KR100481555B1 (en) | Inverse toothed rotor set | |
| CN101187366A (en) | Highly effective inner mesh gear pump or motor | |
| CN218325261U (en) | Radial clearance compensation structure for small-displacement internal gear pump | |
| CN105090258A (en) | Rolling bearing structure of gear pump and gear pump | |
| CN214887279U (en) | Oil pump | |
| CN210152887U (en) | Rotor pump with adjustable rotor clearance | |
| CN2619064Y (en) | Shell rotary type inner curve hydraulic motor | |
| CN201377432Y (en) | Crescent gearpump combined unloading groove | |
| CN201661461U (en) | Inner gearing oil pump for constant-direction oil supply | |
| CN204941925U (en) | High-pressure gear water pump | |
| CN103089620A (en) | Scroll compressor | |
| CN211039028U (en) | Sliding bearing | |
| CN109737052B (en) | Gear pump | |
| CN218493786U (en) | Hydraulic pump assembly of dump truck | |
| CN110617213A (en) | Spiral tooth double-arc tooth-shaped hydraulic gear pump with dynamic and static pressure floating support at shaft end | |
| CN211778848U (en) | Bevel gear |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |