CN103026068A - External gear pump - Google Patents
External gear pump Download PDFInfo
- Publication number
- CN103026068A CN103026068A CN201180029288XA CN201180029288A CN103026068A CN 103026068 A CN103026068 A CN 103026068A CN 201180029288X A CN201180029288X A CN 201180029288XA CN 201180029288 A CN201180029288 A CN 201180029288A CN 103026068 A CN103026068 A CN 103026068A
- Authority
- CN
- China
- Prior art keywords
- external gear
- gear pump
- bypass
- pass piston
- piston
- 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.)
- Granted
Links
Classifications
-
- 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
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/086—Carter
-
- 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
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
- F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
- F04C14/265—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels being obtained by displacing a lateral sealing face
-
- 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
- F04C2240/00—Components
- F04C2240/50—Bearings
- F04C2240/51—Bearings for cantilever assemblies
-
- 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
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/17—Tolerance; Play; Gap
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The invention relates to an external gear pump comprising at least two gears that mesh within an engagement zone as well as a bypass piston that makes it possible to reduce the pressure in the driven external gear pump by allowing a surplus of conveyed fluid to flow from a pressure side to a suction side of the driven external gear pump via a bypass. The invention is characterized in that the bypass piston is arranged with a small clearance in relation to the gears meshing in the engagement zone when the bypass is closed.
Description
Technical field
The present invention relates to a kind of at least two intermeshing gears and have the external gear pump of a bypass piston in mating area that have, this pass piston can allow the pressure decreased of driven external gear pump as follows, so that unnecessary quantity delivered is by the on the pressure side arrival suction side of a bypass from driven external gear pump.
Background technique
Can know a kind of gear pump with two intermeshing gears in housing from German laid-open document DE 44 36 518 A1, piston be close to its distolateral on, described piston shaft is to movably being bearing in the hollow cylinder.When having surpassed a fixed quantity delivered in other words during a predetermined working pressure, described piston overcomes spring force and moves in the hollow cylinder, thereby opens a slit between piston base and gear are distolateral, carry out pressure and reduce and make unnecessary quantity delivered be flowed directly to the suction side of the pump chamber of gear pump by this bypass.
Summary of the invention
Task of the present invention is to prolong the working life such as claim 1 external gear pump as described in the preamble.
This task solves by a kind of external gear pump, this external gear pump has at least two intermeshing gears and have a bypass piston in mating area, described pass piston can allow the pressure decreased of driven external gear pump as follows, so that unnecessary quantity delivered is via the on the pressure side arrival suction side of a bypass from described driven external gear pump, the settling mode of described task is that described pass piston arranges with little gap with respect to intermeshing gear in described mating area when described bypass is closed.External gear pump is preferably mechanically driven.For example use a live axle in order to drive external gear pump, this live axle and the coupling of combustion engine mechanical ground.Particularly during and thickness cold when the fed sheet of a media of external gear pump, can avoid high refluence pressure and therewith relevant loss by the bypass of opening.This advantage that can provide is, when not needing to carry and internal-combustion engine when still turning round, external gear pump needn't with the internal-combustion engine decoupling zero.Can significantly reduce not wish the damage of the frictional loss, wearing and tearing and the driven external gear pump that occur by the little gap between the gear of bypass and rotation.
A kind of preferred embodiment of external gear pump is characterised in that the outer diameter of pass piston is significantly less than the outer diameter of intermeshing gear.What can realize like this is, be used for gear, for example the axial surface of contact on the housing of external gear pump not can owing to the pass piston picture for example in by the known gear pump of German laid-open document DE 44 36 518 A1 degree reduction.
The another kind of preferred embodiment of external gear pump is characterised in that pass piston is supported on the housing convex shoulder when bypass is closed.This housing convex shoulder can be designed in the housing matrix or housing lid of alms bowl shape.By being supported on the housing convex shoulder, pass piston can pass piston be arranged with little gap with respect to the mating area of intermeshing gear with simple mode and method.
The another kind of preferred embodiment of external gear pump is characterised in that, pass piston is tightened on the housing convex shoulder in advance with hydraulic way.By the realization of hydraulic type pretension is that pass piston rests on the housing convex shoulder when bypass is closed.The hydraulic type pretension can be by acting on the hydraulic pressure generation on the pass piston.When hydraulic pressure reduces, and/or when in the mating area of discharge pressure at intermeshing gear of external gear pump during greater than hydraulic pre-tightening power, then the pass piston motion is left the housing convex shoulder and is discharged described bypass.
The another kind of preferred embodiment of external gear pump is characterised in that, utilizes spring to make the relative housing convex shoulder of pass piston pretension.This spring is pressure spring preferably, makes pass piston keep being close on the housing convex shoulder when bypass is closed by described pressure spring.When the discharge pressure in the mating area of pitch wheel during greater than the pretightening force of spring, then bypass is opened.Can additionally load hydraulic pressure to pass piston, in order to improve the control of hydraulic piston.Spring also can be used to form pressure-limit valve with pass piston.So, if by the area difference on the pass piston so that for example the discharge pressure of external gear pump feed back on the pass piston as control force, then also can utilize pass piston to realize the effect of defferential valve.Also possiblely in addition be, pass piston at least in part by the metal with shape or structure memory capability, be that so-called marmem is made.Attainable thus is that the shape of pass piston, particularly its size and temperature correlation ground change.This effect can be used for controlling described bypass.Pass piston also can be used other temperature variant parts, and described parts provide control force and/or control approach.Acting on control force in the bypass also can be mechanically, electric mode or apply by other technology parameter.
The another kind of preferred embodiment of external gear pump is characterised in that pass piston has axial guide section, and pass piston utilizes described guide section to be directed to to-and-fro motion in housing groove.This housing groove can be arranged in the housing matrix or housing lid of alms bowl shape.
The another kind of preferred embodiment of external gear pump is characterised in that pass piston has axial bypass section, and this bypass section has than the little outer diameter of guide section and at its free end one bypass closing face is set.This bypass closing face for example be circular and when bypass is closed the mating area with respect to intermeshing gear arrange with little gap.
The another kind of preferred embodiment of external gear pump is characterised in that guide section has the axial notch larger than bypass section.Improve thus the guiding of pass piston in housing groove.
The another kind of preferred embodiment of external gear pump is characterised in that pass piston has ladder between guide section and bypass section, and pass piston utilizes described ladder to be close on the housing convex shoulder when bypass is closed.By the axial stretching, extension of described bypass section can regulate described bypass closing face and described in mating area the gap between the intermeshing gear.
The present invention relates to the application of aforementioned external teeth wheel pump in addition, is used for the hydraulic control system of the automatic transmission of sap pressure supply control system, particularly Motor Vehicle.Hydraulic control system in the automatic transmission is supplied the speed changer final controlling element on the one hand, usually also is necessary for the Cooling and Lubricator function on the other hand.Utilize the external gear pump of invention the scheme mechanically decoupled with respect to pump and its thermo-mechanical drive to provide favourable replacement scheme.By the bypass that discharged by pass piston short circuit external gear pump as required, in order to reduce the pressure loss of driven pump.Interrupt thus the conveying of external gear pump.
Description of drawings
Other advantages of the present invention, feature and details can obtain from following explanation, are described in detail with reference to the attached drawings different embodiments in described explanation.In the accompanying drawing:
Fig. 1 is bypass longitudinal section according to the external gear pump of invention when closing;
Fig. 2 is bypass external gear pump among Fig. 1 when opening;
Fig. 3 is the embodiment who is similar to Fig. 1 and 2, has on closed position the pass piston by spring pre-tightening.
Embodiment
Longitudinal section with external gear pump 1 of pump case 2 has been shown in Fig. 1 and Fig. 2, and bypass here opens and closes separately.Pump case 2 comprises the housing matrix of an alms bowl shape, and its bottom is strengthened by a plate 3.The alms bowl shape matrix of pump case 2 is by 4 sealings of a pump cover.
In pump case 2, two gears 11,12 intermeshing.Gear 11 drives via taking moving part 15 by (unshowned) live axle 14.Gear 12 is rotating being bearing on the bearing support 18 in pump case 2.These two gears 11,12 so intermesh in mating area 20, so that as long as gear 11 drives via live axle 14, then fed sheet of a media just is transported on the pressure side by these two gears 11, the 12 suction sides from external gear pump 1.
Pump case 2 has housing groove 24 in two gears 11,12 mating area 20, but pass piston 25 is directed to to-and-fro motion in described groove.Pass piston 25 is utilized it to deviate from the distolateral of mating area 20 gauge is carried out in pilot pressure chamber 26, and this pilot pressure chamber can be loaded hydraulic pressure.Pass piston 25 is tightened on the housing convex shoulder 30 with hydraulic way in advance via pilot pressure chamber 26, and this housing convex shoulder is configured in the described housing groove 24.
Pass piston 25 is divided into an axial guide section 31 and an axial bypass section 32 in the axial direction.Described axial guide section 31 has the outer diameter larger than described axial bypass section 32.Between guide section 31 and bypass section 32 structure one ladder 33, utilize this ladder make pass piston 25 the closed position shown in its Fig. 1 be close to or backstop on housing convex shoulder 30.Pass piston 25 has bypass closing face 35 at it towards mating area 20 distolateral, and described bypass closing face arranges with little gap (cannot see in Fig. 1) with respect to the gear 11 in the mating area 20 and 12 in the closed position of described pass piston 25.
Pass piston 25 in open position shown in Figure 2 with the gear 11 in its bypass closing face 35 and the mating area 20 and 12 such degree spaced apart so that discharge enough large bypass 40, described bypass make external gear pump 1 on the pressure side with aspirate the side short circuit.Pass piston 25 for example open by the hydraulic pressure in the pilot pressure chamber 26 reduce realize.By the pressure in the corresponding increase pilot pressure chamber 26 pass piston 25 is closed again.
Figure 3 illustrates a kind of external gear pump 41, the external gear pump 1 among it and Fig. 1 and 2 is very similar.Identical parts utilize identical mark to represent.For fear of repetition, only the difference between two kinds of external gear pumps 1 and 41 is described hereinafter.
In external gear pump shown in Figure 3 41, by spring 46 with pass piston 45 pretensions in its closed position.This spring 46 is constructed to helical compression spring and partly is received in the corresponding recesses of pass piston 45.This pass piston 45 can additionally be controlled with hydraulic way via pilot pressure chamber 26.
The reference character table
1 external gear pump
2 pump case
3 plates
4 pump covers
11 gears
12 gears
14 live axles
15 take moving part
18 bearing supports
20 mating areas
24 housing groove
25 pass piston
Pilot pressure chambers 26
30 housing convex shoulders
31 axial guide sections
32 axial bypass sections
33 ladders
35 bypass closing faces
40 bypasses
41 external gear pumps
45 pass piston
46 springs
Claims (10)
1. external gear pump, it has at least two intermeshing gears (11,12) and have a bypass piston (25) in mating area (20), and described pass piston can allow driven external gear pump (1 as follows; 41) pressure decreased, so that unnecessary quantity delivered is via the on the pressure side arrival suction side of a bypass (40) from described driven external gear pump (1,41), it is characterized in that described pass piston (25) arranges with little gap with respect to intermeshing gear (11,12) in described mating area (20) when closing in described bypass (40).
2. according to claim 1 external gear pump is characterized in that the outer diameter of described pass piston (25) is significantly less than the outer diameter of intermeshing gear (11,12).
3. according to the external gear pump of one of above-mentioned claim, it is characterized in that described pass piston (25) is supported on the housing convex shoulder (30) when described bypass is closed.
4. according to claim 3 external gear pump is characterized in that described pass piston (25) is tightened on the described housing convex shoulder (30) in advance with hydraulic way.
5. according to claim 3 or 4 external gear pump, it is characterized in that described pass piston (25) is tightened on the described housing convex shoulder (30) in advance by spring (46).
6. according to claim 3 to one of 5 external gear pump, it is characterized in that, described pass piston (25) has an axial guide section (31), and described pass piston (25) can utilize described guide section to be directed to to-and-fro motion in a housing groove (24).
7. according to claim 6 external gear pump, it is characterized in that, described pass piston (25) has an axial bypass section (32), and described bypass section has than the little outer diameter of described guide section (31) and at its free end structure one bypass closing face (35).
8. according to claim 7 external gear pump is characterized in that the axial stretching, extension of described guide section (31) is larger than the axial stretching, extension of described bypass section (32).
9. according to claim 7 or 8 external gear pump, it is characterized in that, described pass piston (25) has a ladder (33) between described guide section (31) and described bypass section (32), described pass piston (25) utilizes described ladder backstop on described housing convex shoulder (30) in described bypass (40) when closing.
10. according to the described external gear pump (1 of one of the claims; 41) application is used for the sap pressure supply control gear, especially for the hydraulic control device of the automatic transmission of dispenser device motor-car.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010023712 | 2010-06-14 | ||
| DE102010023712.4 | 2010-06-14 | ||
| PCT/DE2011/001099 WO2012016552A2 (en) | 2010-06-14 | 2011-05-23 | External gear pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103026068A true CN103026068A (en) | 2013-04-03 |
| CN103026068B CN103026068B (en) | 2016-04-27 |
Family
ID=44629786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180029288.XA Expired - Fee Related CN103026068B (en) | 2010-06-14 | 2011-05-23 | external gear pump |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN103026068B (en) |
| DE (2) | DE112011102000A5 (en) |
| WO (1) | WO2012016552A2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015020442A1 (en) | 2013-08-09 | 2015-02-12 | Lg Electronics Inc. | Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4097206A (en) * | 1975-12-02 | 1978-06-27 | Robert Bosch Gmbh | Gear pump or motor with bypass throttle passage to prevent cavitation |
| FR2706541A1 (en) * | 1993-06-11 | 1994-12-23 | Renault Vehicules Ind | Method for regulating the pressure and delivery flow rate of a positive-displacement pump, and positive-displacement pump for implementing the method |
| DE19913406A1 (en) * | 1999-03-25 | 2000-04-20 | Bosch Gmbh Robert | Fuel feed pump to feed fuel from an intake chamber into a pressure chamber contains regulator piston to influence hydraulic pump action, and is without bypass channel |
| KR20010048365A (en) * | 1999-11-26 | 2001-06-15 | 구자홍 | Trochoid gear pump |
| CN1434911A (en) * | 2000-05-25 | 2003-08-06 | Gkn金属烧结有限公司 | Regulated pump |
| WO2004106742A1 (en) * | 2003-05-29 | 2004-12-09 | Fristam Pumps, Inc. | Rotary piston pump with pressure relief |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4436518A1 (en) | 1994-10-13 | 1996-04-18 | Soc Europ De Mecanique Sa | Gear pump |
-
2011
- 2011-05-23 CN CN201180029288.XA patent/CN103026068B/en not_active Expired - Fee Related
- 2011-05-23 DE DE112011102000T patent/DE112011102000A5/en not_active Ceased
- 2011-05-23 DE DE201110102259 patent/DE102011102259A1/en not_active Withdrawn
- 2011-05-23 WO PCT/DE2011/001099 patent/WO2012016552A2/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4097206A (en) * | 1975-12-02 | 1978-06-27 | Robert Bosch Gmbh | Gear pump or motor with bypass throttle passage to prevent cavitation |
| FR2706541A1 (en) * | 1993-06-11 | 1994-12-23 | Renault Vehicules Ind | Method for regulating the pressure and delivery flow rate of a positive-displacement pump, and positive-displacement pump for implementing the method |
| DE19913406A1 (en) * | 1999-03-25 | 2000-04-20 | Bosch Gmbh Robert | Fuel feed pump to feed fuel from an intake chamber into a pressure chamber contains regulator piston to influence hydraulic pump action, and is without bypass channel |
| KR20010048365A (en) * | 1999-11-26 | 2001-06-15 | 구자홍 | Trochoid gear pump |
| CN1434911A (en) * | 2000-05-25 | 2003-08-06 | Gkn金属烧结有限公司 | Regulated pump |
| WO2004106742A1 (en) * | 2003-05-29 | 2004-12-09 | Fristam Pumps, Inc. | Rotary piston pump with pressure relief |
Also Published As
| Publication number | Publication date |
|---|---|
| DE112011102000A5 (en) | 2013-04-04 |
| CN103026068B (en) | 2016-04-27 |
| WO2012016552A3 (en) | 2012-12-27 |
| WO2012016552A2 (en) | 2012-02-09 |
| DE102011102259A1 (en) | 2011-12-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160427 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |