CN110685899B - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
CN110685899B
CN110685899B CN201911192359.2A CN201911192359A CN110685899B CN 110685899 B CN110685899 B CN 110685899B CN 201911192359 A CN201911192359 A CN 201911192359A CN 110685899 B CN110685899 B CN 110685899B
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China
Prior art keywords
gear
pressure cavity
diversion trench
pump
pressure chamber
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CN201911192359.2A
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Chinese (zh)
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CN110685899A (en
Inventor
赵洪锋
赵亮
张凯
韩志英
杨凯
王向前
韩正杰
陈荣尚
白祥志
邵振振
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Henan Aerospace Hydraulic and Pneumatic Technology Co Ltd
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Henan Aerospace Hydraulic and Pneumatic Technology Co Ltd
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Priority to CN201911192359.2A priority Critical patent/CN110685899B/en
Publication of CN110685899A publication Critical patent/CN110685899A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

The present invention relates to gear pumps. The gear pump comprises a pump shell, wherein a gear matching surface is arranged on the pump shell, and the gear matching surface comprises an outer ring part and an inner ring part, wherein the outer ring part is used for being in clearance fit with gear teeth of the gear; a high-pressure cavity diversion trench is arranged on the gear matching surface, and the high-pressure cavity diversion trench is provided with an inner end of the high-pressure cavity diversion trench positioned on the inner ring part and an outer end of the high-pressure cavity diversion trench positioned on the outer ring part or on the outer side of the outer ring part; in the rotating direction of the corresponding gear, the inner end of the high-pressure cavity diversion trench is positioned at the rear side of the outer end of the high-pressure cavity diversion trench, or the outer end of the high-pressure cavity diversion trench is positioned at the radial outer side of the inner end of the high-pressure cavity diversion trench; the outer end of the high-pressure cavity diversion trench is communicated with the high-pressure cavity, so that oil in a gear end surface gap is guided out to the high-pressure cavity when the gear rotates, end surface leakage is reduced, the volume loss of the gear pump is reduced, the performance of the gear pump is improved, and the friction force between a gear and a gear matching surface can be reduced by the arrangement of the high-pressure cavity diversion trench, so that the loss of input power of the gear pump is reduced.

Description

Gear pump
Technical Field
The present invention relates to a gear pump.
Background
The gear pump generally includes an upper cover, a pump body, an end cover, a driving shaft, a driving gear, a driven gear and the like. In the working process of the gear pump, when the driving gear and the driven gear are in meshing transmission, gear teeth meshed with the low-pressure oil suction cavity are separated, the volume in the oil suction cavity is increased, a certain vacuum space is generated, oil in the oil tank enters the oil suction cavity through the oil inlet under the action of the external atmospheric pressure, then the oil in the oil suction cavity is brought to the high-pressure oil pressing cavity by the rotating gear, the gear teeth of the driving gear and the driven gear on one side of the oil pressing cavity are meshed, the volume in the oil suction cavity is compressed, and the oil is extruded to the oil outlet, so that the whole oil pumping process is completed.
Because it is not totally sealed to inhale between the oil pocket in high pressure oil chamber and the low pressure in the gear pump, at the in-process of gear pump work, fluid can follow high pressure oil chamber and enter into the low pressure and inhale the oil pocket to lead to leaking in the fluid of gear pump, cause gear pump volumetric loss, and lead to leaking in the fluid of gear pump, gear pump volumetric loss's reason mainly includes: radial leakage, end face leakage and gear mesh point leakage, practice shows: the end face leakage accounts for 75% to 80% of the total leakage of the whole gear. End face leakage consists of two parts: (1) when the gear tooth grooves bring oil from the low-pressure oil suction cavity to the high-pressure oil compression cavity, the oil leaks to the shaft diameter of the driving shaft or the driven shaft from the tooth grooves through end face gaps and returns to the low-pressure oil receiving cavity through the bearings; (2) the high-pressure oil outlet liquid in the oil outlet is leaked back to the low-pressure oil suction cavity through the gear end face gap, and the end face gap leakage at the gear meshing position between the driving shaft and the driven shaft is mainly caused. The loss of gear pump volume reduces the volumetric efficiency of the gear pump, thereby reducing the performance of the gear pump.
Disclosure of Invention
The invention aims to provide a gear pump, which aims to solve the technical problems that the volume loss of the gear pump, the volume efficiency reduction of the gear pump and the performance reduction of the gear pump are caused by the end face leakage of the gear pump in the prior art.
The gear pump adopts the following technical scheme: the gear pump includes: a pump housing; two intermeshing gears; the pump shell is internally provided with a low-pressure cavity, a high-pressure cavity and a tooth socket cavity which is formed by the tooth socket of the gear and the pump shell in a surrounding way; two gear shafts are arranged, supported on the pump shell, in one-to-one correspondence with the gears and coaxially arranged with the corresponding gears; the pump shell comprises two pump covers, the pump covers are provided with gear matching surfaces in clearance fit with the gears, or the pump shell is internally provided with a floating side plate positioned between the pump covers and the corresponding gears, and the floating side plate is provided with gear matching surfaces in clearance fit with the gears; the gear matching surface comprises an outer ring part and an inner ring part positioned in the outer ring part, the outer ring part is in clearance fit with the gear tooth end surface of the gear, and the inner ring part is in clearance fit with the part, positioned between the gear root and the gear shaft, on the gear end surface; a high-pressure cavity diversion trench is arranged on the gear matching surface, the high-pressure cavity diversion trench extends from the inner ring part to the direction far away from the gear shaft, and the high-pressure cavity diversion trench is provided with an inner end close to the high-pressure cavity diversion trench of the corresponding gear shaft and an outer end far away from the high-pressure cavity diversion trench of the corresponding gear shaft; in the rotating direction of the corresponding gear, the inner end of the high-pressure cavity diversion trench is positioned at the rear side of the outer end of the high-pressure cavity diversion trench, or the outer end of the high-pressure cavity diversion trench is positioned at the radial outer side of the inner end of the high-pressure cavity diversion trench; the inner end of the high-pressure cavity diversion trench is arranged on the inner ring part, the outer end of the high-pressure cavity diversion trench is arranged on the outer ring part or is positioned outside the outer ring part, and the outer end of the high-pressure cavity diversion trench is communicated with the high-pressure cavity so as to guide oil in a gap between a gear matching surface and a gear to the high-pressure cavity when the gear rotates, so that end face leakage is reduced.
The invention has the beneficial effects that: the oil between the gear and the gear matching surface can be driven by the gear to enter the high-pressure cavity diversion trench in the gear rotating process, the oil in the high-pressure cavity diversion trench generates centrifugal force in the direction deviating from the axis of the corresponding gear under the driving of the gear, the centrifugal force can drive the oil in the high-pressure cavity diversion trench to move towards the outer end of the high-pressure cavity diversion trench to the high-pressure cavity or move towards the outer end of the high-pressure cavity diversion trench and be guided to the high-pressure cavity by the gear tooth grooves, the oil amount entering the low-pressure cavity from the high-pressure cavity along the gap between the gear matching surface and the gear can be reduced, the end face leakage is reduced, the volume loss of the gear pump is reduced, the volumetric efficiency of the gear pump is increased, and the performance of the gear pump is improved.
Furthermore, the high-pressure cavity diversion trench is an arc-shaped trench, and the back of the high-pressure cavity diversion trench is convexly arranged towards the gear shaft. The high-pressure cavity diversion trench arranged on the arc-shaped trench can increase the length of the high-pressure cavity diversion trench, so that more oil liquid between the matching surfaces of the gear and the gear can enter the high-pressure cavity diversion trench.
Further, the width dimension of the high-pressure cavity guide groove gradually increases along the direction from the inner end of the high-pressure cavity guide groove to the outer end of the high-pressure cavity guide groove. The high-pressure cavity diversion trench arranged in the structure can increase the flow carrying volume of the high-pressure cavity diversion trench, so that more oil liquid between the matching surfaces of the gear and the gear can enter the high-pressure cavity diversion trench conveniently, and the end face leakage of the gear pump can be reduced.
Furthermore, the guide grooves of the high-pressure cavity are uniformly arranged at intervals in the axial direction of the corresponding gear shaft. The high-pressure cavity diversion trench arranged in the structure can introduce more oil liquid between the matching surfaces of the gear and the gear into the high-pressure cavity diversion trench, so that the end face leakage of the gear pump is further reduced.
Further, be equipped with on the gear fitting surface from the internal ring part to keeping away from the gear shaft direction extension, and at the tooth's socket chamber guiding gutter that corresponds the circumference interval arrangement of gear shaft, tooth's socket chamber guiding gutter has the tooth's socket chamber guiding gutter inner that is close to corresponding gear shaft and keeps away from the tooth's socket chamber guiding gutter outer end that corresponds the gear shaft, in the direction of rotation that corresponds the gear, tooth's socket chamber guiding gutter inner is in tooth's socket chamber guiding gutter outer end rear side, perhaps tooth's socket chamber guiding gutter outer end is located the radial outside that tooth's socket chamber guiding gutter is inner, tooth's socket chamber guiding gutter inner is on the internal ring part, tooth's socket chamber guiding gutter outer end is on the external ring part, and tooth's socket chamber guiding gutter outer end with tooth's socket chamber intercommunication. The oil between the gear and the gear matching surface can be driven by the gear to enter the tooth space cavity diversion groove in the gear rotating process, the oil in the tooth space cavity diversion groove generates a centrifugal force in the direction deviating from the axis of the corresponding gear under the driving of the gear, the centrifugal force can drive the oil in the tooth space cavity diversion groove to move to the tooth space cavity towards the outer end of the tooth space cavity diversion groove and be brought into a high-pressure cavity in the gear rotating process, the oil entering the low-pressure cavity from the gap between the gear matching surface and the gear can be further reduced, the end surface leakage is reduced, the volume loss of the gear pump is further reduced, and the volume efficiency of the gear pump is increased; and the arrangement of the tooth space cavity diversion trench can reduce the contact area between the gear and the gear matching surface, reduce the friction force between the gear and the gear matching surface and reduce the loss of the input power of the gear pump.
Further, the shape of the tooth socket cavity diversion trench is the same as that of the high-pressure cavity diversion trench. The tooth socket cavity diversion trench and the high-pressure cavity diversion trench are the same in shape, so that the processing technology of the whole gear pump is simplified, and the manufacturing difficulty of the gear pump is reduced.
Furthermore, the gear fitting surface is provided with low-pressure cavity guide grooves which extend from the inner ring part to the direction far away from the gear shaft and are arranged at intervals in the axial direction of the corresponding gear shaft, the low-pressure cavity guide grooves are provided with inner low-pressure cavity guide grooves close to the corresponding gear shaft and outer low-pressure cavity guide grooves far away from the corresponding gear shaft, the inner low-pressure cavity guide grooves are not communicated with the high-pressure cavity, the inner low-pressure cavity guide grooves are positioned at the rear side of the outer low-pressure cavity guide grooves in the rotating direction of the corresponding gear, or the outer low-pressure cavity guide grooves are positioned at the radial outer side of the inner low-pressure cavity guide grooves, the inner low-pressure cavity guide grooves are positioned on the inner ring part, the outer low-pressure cavity guide grooves are positioned on the outer ring part or the outer side of the outer ring part, and the outer low-pressure cavity guide grooves are communicated with the low-pressure cavity. The arrangement of the low-pressure cavity diversion trench can reduce the contact area between the gear and the gear matching surface, reduce the friction force between the gear and the gear matching surface and reduce the loss of the input power of the gear pump; and the low pressure chamber guiding gutter that above-mentioned structure set up can reduce and enter into the fluid in the clearance between gear and the gear fitting surface from the low pressure chamber, reduces the volume loss of gear pump, increases the volumetric efficiency of gear pump, improves the performance of gear pump.
Further, the low-pressure cavity guide groove and the high-pressure cavity guide groove are the same in shape. The low-pressure cavity diversion trench and the high-pressure cavity diversion trench are the same in shape, so that the processing technology of the whole gear pump is simplified, and the manufacturing difficulty of the gear pump is reduced.
Drawings
FIG. 1 is a schematic structural view of a gear pump of the present invention in example 1;
FIG. 2 is a schematic cross-sectional view of the structure of FIG. 1;
FIG. 3 is a schematic view of the internal structure of the gear pump of FIG. 1;
fig. 4 is a schematic structural diagram of the pump cover in fig. 1.
In the figure: 1-driving gear, 2-driven gear, 5-high pressure cavity, 6-low pressure cavity, 7-tooth groove cavity, 8-driving shaft, 9-driven shaft, 10-upper cover, 11-end cover, 12-gear matching surface, 13-high pressure cavity diversion trench, 14-high pressure cavity diversion trench inner end, 15-high pressure cavity diversion trench outer end, 16-tooth socket cavity diversion trench, 17-tooth socket cavity diversion trench inner end, 18-tooth socket cavity diversion trench outer end, 19-low pressure cavity diversion trench, 20-low pressure cavity diversion trench inner end, 21-low pressure cavity diversion trench outer end.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Specific example 1 of gear pump of the present invention:
as shown in fig. 1 to 3, the gear pump includes a pump housing, two gears are disposed in the pump housing, the two gears are a driving gear 1 and a driven gear 2 which are engaged with each other to form a gear pair, a low pressure chamber 6, a high pressure chamber 5 and a tooth space chamber 7 enclosed by a tooth space and the pump housing are disposed in the pump housing, the high pressure chamber 5 and the low pressure chamber 6 are disposed on two sides of a plane where axes of the two gears are located, the high pressure chamber 5 is communicated with an outlet of the gear pump, and the low pressure chamber 6 is communicated with an inlet of the gear pump.
As shown in fig. 1 and 2, the gear pump further includes a gear shaft including a driving shaft 8 and a driven shaft 9, the driving shaft 8 and the driving gear 1 are rotatably assembled and coaxially arranged in the circumferential direction, and the driven shaft 9 and the driven gear 2 are rotatably assembled and coaxially arranged in the circumferential direction.
As shown in fig. 2, the pump case includes a pump cover, the pump cover is provided with two axial ends which are respectively located at two gears to support two gear shafts, the pump cover includes an upper cover 10 and an end cover 11, the upper cover 10 is provided with two blind holes for supporting the two gear shafts, and the end cover 11 is provided with a blind hole for supporting the driven shaft 9 and a through hole for penetrating out of the driving shaft 8.
As shown in fig. 3 and 4, the pump cover is provided with a gear fitting surface 12 which is in clearance fit with the gear, and the gear fitting surface 12 includes an inner ring portion which is used for being in clearance fit with a portion between a tooth root on the gear and the gear shaft, and an outer ring portion which is used for being in clearance fit with a gear tooth of the gear.
In this embodiment, as shown in fig. 3 and 4, the gear matching surface 12 is provided with guiding grooves extending from the inner ring portion to the direction away from the corresponding gear shaft at the positions of the two gear shafts, the guiding grooves are uniformly arranged at intervals in the circumferential direction of the corresponding gear shaft, the guiding grooves have inner ends close to the corresponding gear shaft and outer ends far away from the gear shaft, the inner ends are on the inner ring portion, the outer ends are on the outer ring portion, and the inner ends are located at the rear side of the outer ends in the rotation direction of each corresponding gear.
As shown in fig. 4, the guide grooves may be divided into high-pressure chamber guide grooves 13, tooth-socket chamber guide grooves 16, and low-pressure chamber guide grooves 19 according to the positions communicated with the outer ends of the guide grooves.
The outer end of the high-pressure cavity diversion trench 13 is a high-pressure cavity diversion trench outer end 15, the inner end of the high-pressure cavity diversion trench outer end is a high-pressure cavity diversion trench inner end 14, the high-pressure cavity diversion trench outer end 15 is communicated with the high-pressure cavity 5, in the gear rotating process, the gear can bring oil between the gear and the gear matching surface 12 into the high-pressure cavity diversion trench 13, the oil in the high-pressure cavity diversion trench 13 can generate centrifugal force deviating from the direction corresponding to the gear axis under the driving of the gear, the centrifugal force can drive the oil in the high-pressure cavity diversion trench 13 to move to the gear tooth groove towards the high-pressure cavity diversion trench outer end 15 and enter the high-pressure cavity 5, so that the amount of the oil entering the low-pressure cavity 6 from the high-pressure cavity 5 along the gap between the gear matching surface 12 and the gear is reduced, the end surface leakage is reduced, the volume loss of the gear pump is facilitated to be reduced, the volume efficiency of the gear pump is increased, and the performance of the gear pump is improved.
The outer end of the tooth socket cavity diversion trench 16 is a tooth socket cavity diversion trench outer end 18, the inner end thereof is a tooth socket cavity diversion trench inner end 17, the tooth socket cavity diversion trench outer end 18 is communicated with the tooth socket cavity 7, during the rotation of the gear, the gear can bring the oil between the gear and the gear matching surface 12 into the tooth chamber diversion trench 16, the oil in the tooth space cavity diversion trench 16 will generate centrifugal force in the direction deviating from the axis of the corresponding gear under the driving of the gear, the centrifugal force drives the oil in the tooth space cavity diversion trench 16 to move to the tooth space cavity 7 of the gear towards the outer end 18 of the tooth space cavity diversion trench and be brought into the high pressure cavity 5 in the rotation process of the gear, the oil quantity entering the low-pressure cavity 6 from the gap between the gear matching surface 12 and the gear is further reduced, the end face leakage is reduced, the volume loss of the gear pump is further reduced, the volume efficiency of the gear pump is increased, and the performance of the gear pump is improved.
The outer end of the low-pressure cavity diversion trench 19 is a low-pressure cavity diversion trench outer end 21, the inner end of the low-pressure cavity diversion trench outer end is a low-pressure cavity diversion trench inner end 20, the low-pressure cavity diversion trench outer end 21 is communicated with the low-pressure cavity 6, the low-pressure cavity diversion trench inner end 20 is not communicated with the high-pressure cavity 5, in the gear rotating process, the gear can bring oil between the gear and the gear matching surface 12 into the low-pressure cavity diversion trench 19, the oil in the low-pressure cavity diversion trench 19 can generate centrifugal force deviating from the direction corresponding to the gear axis under the driving of the gear, the centrifugal force can drive the oil in the low-pressure cavity diversion trench 19 to move to the gear tooth groove towards the low-pressure cavity diversion trench outer end 21 and enter the low-pressure cavity 6, so that the oil amount between the gear and the gear matching surface 12 is reduced, the volume loss of the gear pump is reduced, the volume efficiency of the gear pump is increased, and the performance of the gear pump is improved.
The arrangement of the high-pressure cavity diversion trench 13, the tooth space cavity diversion trench 16 and the low-pressure cavity diversion trench 19 can also reduce the contact area between the gear and the gear matching surface 12, reduce the friction force between the gear and the gear matching surface 12 and further reduce the loss of the input power of the gear pump.
In this embodiment, as shown in fig. 4, the guiding gutter is an arc-shaped groove, and the guiding gutter is arranged in a protruding manner opposite to the corresponding gear shaft, so as to increase the length of the guiding gutter, so that more oil between the gear and the gear matching surface 12 can enter the corresponding guiding gutter, thereby facilitating the reduction of the oil amount between the gear and the gear matching surface 12, facilitating the reduction of the volume loss of the whole gear pump, and improving the volumetric efficiency of the gear pump.
In this embodiment, as shown in fig. 4, the width of the guiding groove gradually increases along the direction from the inner end to the outer end thereof to increase the guiding volume of the guiding groove, so as to ensure that more oil between the gear and the gear matching surface 12 enters the guiding groove and is guided out from the guiding groove in the process of rotating along with the gear.
In this embodiment, as shown in fig. 4, the shapes of the high-pressure cavity guiding groove 13, the tooth socket cavity guiding groove 16 and the low-pressure cavity guiding groove 19 are the same, so as to simplify the processing industry of the whole gear pump and reduce the manufacturing difficulty of the gear pump.
Specific example 2 of gear pump of the present invention:
it differs from example 1 in that: only set up the high pressure chamber guiding gutter of outer end and high pressure chamber intercommunication on the gear fitting surface, do not set up low pressure chamber guiding gutter and tooth's socket chamber guiding gutter, the terminal surface leakage that sets up the reducible gear pump of high pressure chamber guiding gutter helps reducing the volume loss of gear pump, increases the volumetric efficiency of gear pump, and the gear pump that this kind of structure set up moreover can simplify the processing preparation of gear pump, reduces the processing cost, improves machining efficiency.
Specific example 3 of gear pump of the present invention:
it differs from example 1 in that: only set up the high pressure chamber guiding gutter of outer end and high pressure chamber intercommunication and the tooth's socket chamber guiding gutter of outer end and tooth's socket chamber intercommunication on the gear fitting surface, do not set up the low pressure chamber guiding gutter, the terminal surface leakage that sets up the reducible gear pump of high pressure chamber guiding gutter and tooth's socket chamber guiding gutter helps reducing the volumetric loss of gear pump, increase the volumetric efficiency of gear pump, the gear pump that this kind of structure set up moreover also can simplify the processing preparation of gear pump, reduce the processing cost, and the improvement machining efficiency.
Specific example 4 of gear pump of the present invention:
it differs from example 1 in that: the outer end of guiding gutter is located the radial outside of its gear shaft of inner correspondence, inner is in the internal ring part, the outer end is in the external ring part, each guiding gutter all is sharp the straight line shape and arranges along the radial extension that corresponds the gear shaft promptly, the guiding gutter of this kind of structure setting also can lead to the fluid in the clearance between gear and the gear fitting surface, under the drive of gear, the centrifugal force that fluid in the guiding gutter received can drive the fluid in the corresponding guiding gutter and enter into the high pressure chamber respectively, tooth groove cavity and low pressure chamber, with the fluid in the clearance between reduction gear and the gear fitting surface, reduce the volume loss of gear pump, increase the volumetric efficiency of gear pump, improve the performance of gear pump.
Specific example 5 of gear pump of the present invention:
it differs from example 1 in that: the width dimension of the diversion trench along the direction from the inner end to the outer end of the diversion trench is the same, the structure arrangement can further increase the flow carrying volume in the diversion trench, and the diversion trench on the gear matching surface can be conveniently processed and manufactured.
Specific example 6 of gear pump of the present invention:
it differs from example 1 in that: be equipped with the curb plate that floats in the pump case, the curb plate setting that floats is between pump cover and corresponding gear, and the gear fitting surface sets up on the curb plate that floats, and the guiding gutter setting is on the curb plate that floats promptly, and this kind of structure setting also can reduce the terminal surface leakage of gear pump, increases the volumetric efficiency of gear pump, improves the performance of gear pump.
Specific example 7 of gear pump of the present invention:
it differs from example 1 in that: the outer end of the tooth socket cavity diversion trench is arranged on the outer ring part, the outer end of the high-pressure cavity diversion trench and the outer end of the low-pressure cavity diversion trench are both arranged on the outer side of the outer ring part, the high-pressure cavity diversion trench and the low-pressure cavity diversion trench which are arranged by the structure can be brought to the corresponding high-pressure cavity and the corresponding low-pressure cavity under the diversion effect of the corresponding diversion trenches and the centrifugal force applied to oil, and the diversion efficiency of the high-pressure cavity diversion trench and the low-pressure cavity diversion trench can be improved.
Specific example 8 of gear pump of the present invention:
it differs from example 1 in that: the shape of the low-pressure cavity diversion trench is different from that of the high-pressure cavity diversion trench, and the structures of the tooth socket cavity diversion trench and the high-pressure cavity diversion trench are also different. The low pressure chamber guiding gutter and tooth's socket chamber guiding gutter are sharply just along the radial extension that corresponds the gear shaft and arrange promptly, and the high pressure chamber guiding gutter outer end of high pressure chamber guiding gutter is located the rear side of the gear shaft direction of rotation of high pressure chamber guiding gutter inner, and the radial outside protrusion that the high pressure chamber guiding gutter was towards corresponding the gear shaft is the arc, the width dimension in the direction of high pressure chamber guiding gutter inner to high pressure chamber guiding gutter outer end along high pressure chamber guiding gutter of high pressure chamber guiding gutter crescent. The structure can simplify the processing and manufacturing of the low-pressure cavity diversion trench and the tooth socket cavity diversion trench on the gear matching surface, simplify the processing and manufacturing of the gear pump and improve the processing efficiency of the gear pump.
Specific example of gear pump of the present invention 9:
it differs from example 1 in that: the guiding gutter is the arc wall, and the guiding gutter sets up towards corresponding gear shaft protrusion to increase the length of guiding gutter, make more fluid between gear and the gear fitting surface can enter into corresponding guiding gutter, help reducing the fluid volume between gear and the gear fitting surface, help reducing the bulk loss of whole gear pump, promote the volumetric efficiency of gear pump.
Specific example of gear pump of the present invention 10:
it differs from example 1 in that: the high-pressure cavity diversion trench is only provided with one diversion trench, the high-pressure cavity diversion trench extends from the inner ring part to the direction far away from the gear shaft, the high-pressure cavity diversion trench is provided with the inner end of the high-pressure cavity diversion trench close to the corresponding gear shaft and the outer end of the high-pressure cavity diversion trench far away from the corresponding gear shaft, in the rotating direction of the corresponding gear, the inner end of the high-pressure cavity diversion trench is positioned at the rear side of the outer end of the high-pressure cavity diversion trench, or the outer end of the high-pressure cavity diversion trench is positioned at the radial outer side of the inner end of the high-pressure cavity diversion trench, the inner end of the high-pressure cavity diversion trench is positioned on the inner ring part, the outer end of the high-pressure cavity diversion trench is positioned on the outer ring part or on the outer ring part, and the outer end of the high-pressure cavity diversion trench is communicated with the high-pressure cavity, so that oil in a gap between a gear fitting surface and the gear is guided out to the high-pressure cavity to reduce end surface leakage when the gear rotates, the volume efficiency of the gear pump is increased, and the performance of the gear pump is improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.

Claims (8)

1. A gear pump, comprising:
a pump housing;
two intermeshing gears;
the pump shell is internally provided with a low-pressure cavity, a high-pressure cavity and a tooth socket cavity which is formed by the tooth socket of the gear and the pump shell in a surrounding way;
two gear shafts are arranged, supported on the pump shell, in one-to-one correspondence with the gears and coaxially arranged with the corresponding gears;
the pump shell comprises two pump covers, the pump covers are provided with gear matching surfaces in clearance fit with the gears, or the pump shell is internally provided with a floating side plate positioned between the pump covers and the corresponding gears, and the floating side plate is provided with gear matching surfaces in clearance fit with the gears;
the gear matching surface comprises an outer ring part and an inner ring part positioned in the outer ring part, the outer ring part is in clearance fit with the gear tooth end surface of the gear, and the inner ring part is in clearance fit with the part, positioned between the gear root and the gear shaft, on the gear end surface;
it is characterized in that the preparation method is characterized in that,
a high-pressure cavity diversion trench is arranged on the gear matching surface, the high-pressure cavity diversion trench extends from the inner ring part to the direction far away from the gear shaft, and the high-pressure cavity diversion trench is provided with an inner end close to the high-pressure cavity diversion trench of the corresponding gear shaft and an outer end far away from the high-pressure cavity diversion trench of the corresponding gear shaft;
in the rotating direction of the corresponding gear, the inner end of the high-pressure cavity diversion trench is positioned at the rear side of the outer end of the high-pressure cavity diversion trench; the inner end of the high-pressure cavity diversion trench is arranged on the inner ring part, the outer end of the high-pressure cavity diversion trench is arranged on the outer ring part or positioned outside the outer ring part, and the outer end of the high-pressure cavity diversion trench is communicated with the high-pressure cavity so as to lead oil in a gap between a gear matching surface and a gear to the high-pressure cavity when the gear rotates, so that end face leakage is reduced;
fluid between gear and the gear fitting surface can be at the gear revolve in-process, be driven by the gear and enter into the hyperbaric chamber guiding gutter, the fluid that is located the hyperbaric chamber guiding gutter produces under the drive of gear and deviates from the centrifugal force that corresponds in the gear axis direction, this centrifugal force can drive the fluid in the hyperbaric chamber guiding gutter and move to the hyperbaric chamber towards the hyperbaric chamber guiding gutter outer end of hyperbaric chamber guiding gutter, can reduce the fluid volume that enters into the low-pressure chamber along the clearance between gear fitting surface and the gear from the hyperbaric chamber, reduce the terminal surface and leak.
2. The gear pump of claim 1, wherein the high pressure chamber baffle slot is an arcuate slot, the high pressure chamber baffle slot projecting away from the gear shaft.
3. The gear pump of claim 1, wherein said high pressure chamber channels have a width dimension that increases in a direction from an inner end of the high pressure chamber channel to an outer end of the high pressure chamber channel.
4. The gear pump of claim 1, wherein the high pressure cavity guide slots are evenly spaced circumferentially of the corresponding gear shaft.
5. The gear pump of any one of claims 1 to 4, wherein the gear fitting surface is provided with tooth space cavity guide grooves extending from the inner ring portion to a direction away from the gear shaft and arranged at intervals in the circumferential direction of the corresponding gear shaft, the tooth space cavity guide grooves have inner tooth space cavity guide groove ends close to the corresponding gear shaft and outer tooth space cavity guide groove ends far from the corresponding gear shaft, the inner tooth space cavity guide groove ends are located at the rear side of the outer tooth space cavity guide groove ends in the rotation direction of the corresponding gear, the inner tooth space cavity guide groove ends are located on the inner ring portion, the outer tooth space cavity guide groove ends are located on the outer ring portion, and the outer tooth space cavity guide groove ends are communicated with the tooth space cavity.
6. The gear pump of claim 5, wherein the tooth chamber channels are identically shaped to the high pressure chamber channels.
7. The gear pump according to any one of claims 1 to 4, wherein the gear fitting surface is provided with low pressure chamber grooves extending from the inner ring portion in a direction away from the gear shaft and arranged at intervals in a circumferential direction of the corresponding gear shaft, the low pressure chamber grooves having inner low pressure chamber grooves close to the corresponding gear shaft and outer low pressure chamber grooves far from the corresponding gear shaft, the inner low pressure chamber grooves being not communicated with the high pressure chamber, the inner low pressure chamber grooves being located at a rear side of the outer low pressure chamber grooves in a rotational direction of the corresponding gear, the inner low pressure chamber grooves being located in the inner ring portion, the outer low pressure chamber grooves being located in the outer ring portion or outside the outer ring portion, and the outer low pressure chamber grooves being communicated with the low pressure chamber.
8. The gear pump of claim 7, wherein said low pressure cavity pilot grooves are identically shaped to said high pressure cavity pilot grooves.
CN201911192359.2A 2019-11-28 2019-11-28 Gear pump Active CN110685899B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04325785A (en) * 1991-04-23 1992-11-16 Shimadzu Corp Gear pump
JPH1182323A (en) * 1997-09-11 1999-03-26 Hitachi Ltd Fuel pump
JP2000192889A (en) * 1998-12-25 2000-07-11 Fuji Heavy Ind Ltd Internal gear pump
CN103917785A (en) * 2011-11-10 2014-07-09 丰田自动车株式会社 Internal-gear-type oil pump for vehicle
JP2017082715A (en) * 2015-10-29 2017-05-18 株式会社日本自動車部品総合研究所 Circumscription gear type fuel pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04325785A (en) * 1991-04-23 1992-11-16 Shimadzu Corp Gear pump
JPH1182323A (en) * 1997-09-11 1999-03-26 Hitachi Ltd Fuel pump
JP2000192889A (en) * 1998-12-25 2000-07-11 Fuji Heavy Ind Ltd Internal gear pump
CN103917785A (en) * 2011-11-10 2014-07-09 丰田自动车株式会社 Internal-gear-type oil pump for vehicle
JP2017082715A (en) * 2015-10-29 2017-05-18 株式会社日本自動車部品総合研究所 Circumscription gear type fuel pump

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