CN103026068B - external gear pump - Google Patents
external gear pump Download PDFInfo
- Publication number
- CN103026068B CN103026068B CN201180029288.XA CN201180029288A CN103026068B CN 103026068 B CN103026068 B CN 103026068B CN 201180029288 A CN201180029288 A CN 201180029288A CN 103026068 B CN103026068 B CN 103026068B
- Authority
- CN
- China
- Prior art keywords
- external gear
- gear pump
- pass piston
- bypass
- 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.)
- Expired - Fee Related
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 present invention relates to a kind of external gear pump, it has at least two intermeshing gears and have a pass piston in mating area, described pass piston can allow the pressure of driven external gear pump to reduce as follows, makes unnecessary quantity delivered via the on the pressure side arrival suction side of a bypass from described driven external gear pump.The invention is characterized in, described pass piston is arranged with small―gap suture relative to gear intermeshing in described mating area when described bypass is closed.
Description
Technical field
The present invention relates to and a kind of there are at least two intermeshing gears and have the external gear pump of a pass piston in mating area, this pass piston can allow the pressure of driven external gear pump to reduce as follows, makes unnecessary quantity delivered 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 DE4436518A1, a piston is close on its side, and described piston shaft is to being movably bearing in hollow cylinder.When exceeded a fixed quantity delivered in other words a predetermined working pressure time, described piston overpowers spring force moves in hollow cylinder, thus between piston base and gear side, opens a gap, carries out pressure reduction 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, extends the working life according to external gear pump of the present invention.
This task is solved by a kind of external gear pump, this external gear pump has at least two intermeshing gears and have a pass piston in mating area, described pass piston can allow the pressure of driven external gear pump to reduce as follows, make unnecessary quantity delivered 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, described pass piston is arranged with small―gap suture relative to gear intermeshing in described mating area when described bypass is closed.External gear pump is preferably mechanically driven.In order to drive external gear pump such as to use a live axle, be coupled this live axle and combustion engine mechanical.Particularly when the fed sheet of a media of external gear pump is cold and thickness time, high refluence pressure and loss related to this can be avoided by the bypass of opening.This advantage that can provide is, when do not need conveying and internal-combustion engine still operate time, external gear pump need not with internal-combustion engine decoupling zero.The damage of the frictional loss that can significantly reduce not wish to occur by the small―gap suture between bypass and the gear of rotation, wearing and tearing and driven external gear pump.
The feature of a kind of preferred embodiment of external gear pump is, the outer diameter of pass piston is significantly less than the outer diameter of intermeshing gear.In this manner, it is accomplished that for gear, axial surface of contact such as on the housing of external gear pump can not due to pass piston as such as in by German laid-open document DE4436518A1 in known gear pump degree reduce.
The feature of the another kind of preferred embodiment of external gear pump is, pass piston is supported on a housing shoulder when bypass is closed.In the housing base that this housing shoulder can be designed in alms bowl shape or housing lid.Being supported on housing shoulder by making pass piston to make pass piston arrange with small―gap suture relative to the mating area of intermeshing gear in a straightforward manner with method.
The feature of the another kind of preferred embodiment of external gear pump is, pass piston is tightened in advance on housing shoulder with hydraulic way.Realized by hydraulic type pretension, pass piston rests on housing shoulder when bypass is closed.Hydraulic type pretension can be produced by the hydraulic pressure acted in pass piston.When hydraulic pressure reduces, and/or when the discharge pressure of external gear pump is greater than hydraulic pre-tightening power in the mating area of intermeshing gear, then pass piston motion is left housing shoulder and discharges described bypass.
The feature of the another kind of preferred embodiment of external gear pump is, utilizes spring to make the relative housing shoulder pretension of pass piston.This spring preferably pressure spring, makes pass piston keep when bypass is closed being close on housing shoulder by described pressure spring.When discharge pressure in the mating area of pitch wheel is greater than the pretightening force of spring, then bypass is opened.Additionally hydraulic pressure can be loaded, to improve the control of hydraulic piston to pass piston.Spring also can be used to form pressure-limit valve together with pass piston.So, if make the discharge pressure of such as external gear pump feed back in pass piston as control force by the difference in areas in pass piston, then pass piston also can be utilized to realize the effect of defferential valve.In addition also possible that, pass piston is made up of metal, the i.e. so-called marmem with shape or structure memory ability at least in part.Attainable thus, the shape of pass piston, particularly its size and temperature correlation ground change.This effect may be used for controlling described bypass.Pass piston also can use other temperature variant parts, and described parts provide control force and/or controlling soil moist.Act on control force in bypass also can mechanically, electric mode or the technology parameter by other apply.
The feature of the another kind of preferred embodiment of external gear pump is, pass piston has axial guide section, and pass piston utilizes described guide section to be reciprocally directed in housing groove.In the housing base that this housing groove can be arranged on alms bowl shape or housing lid.
The feature of the another kind of preferred embodiment of external gear pump is, pass piston has axial bypass section, and this bypass section has the outer diameter less than guide section and on its free end, arranges a bypass closing face.This bypass closing face is such as circular and arranges with small―gap suture relative to the mating area of intermeshing gear when bypass is closed.
The feature of the another kind of preferred embodiment of external gear pump is, guide section has the axial notch larger than bypass section.Improve the guiding of pass piston in housing groove thus.
The feature of the another kind of preferred embodiment of external gear pump is, pass piston has ladder between guide section and bypass section, and pass piston utilizes described ladder to be close on housing shoulder when bypass is closed.Stretched by the axis of described bypass section and can regulate described bypass closing face and described gap in mating area between intermeshing gear.
The present invention relates to the application of aforementioned external teeth wheel pump in addition, for the hydraulic control system of the automatic transmission of sap pressure supply control system, particularly Motor Vehicle.Hydraulic control system in automatic transmission is supplied speed changer final controlling element on the one hand, and another aspect is also usually necessary for Cooling and Lubricator function.Utilize the external gear pump of invention can provide favourable replacement scheme relative to pump and the mechanically decoupled scheme of its thermo-mechanical drive.Can short circuit external gear pump as required by the bypass that discharged by pass piston, to reduce the pressure loss of driven pump.Interrupt the conveying of external gear pump thus.
Accompanying drawing explanation
Other advantages of the present invention, characteristic sum details can obtain from explanation below, in described explanation, be described in detail with reference to the attached drawings different embodiments.In accompanying drawing:
According to the longitudinal section of the external gear pump of invention when Fig. 1 is bypass closedown;
Fig. 2 is the external gear pump of bypass when opening in Fig. 1;
Fig. 3 is the embodiment being similar to Fig. 1 and 2, has the pass piston by spring pre-tightening in closed position.
Embodiment
Show the longitudinal section that has the external gear pump 1 of pump case 2 in fig. 1 and 2, bypass here opens and closes separately.Pump case 2 comprises the housing base of an alms bowl shape, is strengthened bottom it by a plate 3.The alms bowl shape matrix of pump case 2 is closed by a pump cover 4.
In pump case 2, two gears 11,12 engage each other.Gear 11 is driven via taking moving part 15 by (unshowned) live axle 14.Gear 12 is rotating in pump case 2 to be bearing on bearing support 18.These two gears 11,12 so intermesh in mating area 20, as long as make gear 11 drive via live axle 14, then fed sheet of a media is just transported on the pressure side from the suction side of external gear pump 1 by these two gears 11,12.
Pump case 2 has housing groove 24 in the mating area 20 of two gears 11,12, and pass piston 25 is reciprocally directed in described groove.Pass piston 25 utilizes its side deviating from mating area 20 to carry out gauge to pilot pressure room 26, and this pilot pressure room can be loaded hydraulic pressure.Pass piston 25 is tightened on housing shoulder 30 via pilot pressure room 26 with hydraulic way in advance, and this housing shoulder is configured in described housing groove 24.
Pass piston 25 is divided into the guide section 31 of an axis and the bypass section 32 of an axis 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, construct a ladder 33, utilize this ladder that pass piston 25 is close in the closed position shown in its Fig. 1 or backstop on housing shoulder 30.Pass piston 25 has bypass closing face 35 on its side towards mating area 20, and described bypass closing face is arranged with small―gap suture (cannot see in FIG) relative to the gear 11 and 12 in mating area 20 in the closed position of described pass piston 25.
Pass piston 25 is spaced apart with its bypass closing face 35 and the such degree of gear 11 and 12 in mating area 20 in the open position shown in Fig. 2, makes the bypass 40 that release one is enough large, described bypass make external gear pump 1 on the pressure side with suction side short circuit.Opening of pass piston 25 is such as realized by the reduction of the hydraulic pressure in pilot pressure room 26.Pass piston 25 can be made as required again to close by the pressure in corresponding increase pilot pressure room 26.
Figure 3 illustrates a kind of external gear pump 41, the external gear pump 1 in it and Fig. 1 and 2 is very similar.Identical parts utilize identical mark to represent.In order to avoid repeating, only the difference between two kinds of external gear pumps 1 and 41 is described hereinafter.
In the external gear pump 41 shown in Fig. 3, by spring 46 by pass piston 45 pretension in its closed position.This spring 46 is constructed to helical compression spring and is partially received in the corresponding recesses of pass piston 45.This pass piston 45 additionally can control with hydraulic way via pilot pressure room 26.
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
26 pilot pressure rooms
30 housing shoulder
The guide section of 31 axis
The bypass section of 32 axis
33 ladders
35 bypass closing faces
40 bypasses
41 external gear pumps
45 pass piston
46 springs
Claims (10)
1. an external gear pump, it has at least two intermeshing gears (11,12) and have a pass piston (25) in mating area (20), and described pass piston can allow driven external gear pump (1 as follows; 41) pressure reduces, make unnecessary quantity delivered 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) is arranged with small―gap suture relative to intermeshing gear (11,12) in described mating area (20) when described bypass (40) is closed, and described pass piston (25) is close to when described bypass is closed and is supported on a housing shoulder (30).
2. external gear pump according to claim 1, 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. external gear pump according to claim 1, is characterized in that, described pass piston (25) is tightened on described housing shoulder (30) in advance by with hydraulic way.
4. according to the external gear pump of one of claim 1-3, it is characterized in that, described pass piston (25) is tightened on described housing shoulder (30) in advance by spring (46).
5. according to the external gear pump of one of claims 1 to 3, it is characterized in that, described pass piston (25) has the guide section (31) of an axis, and described pass piston (25) can utilize described guide section to be reciprocally directed in a housing groove (24).
6. external gear pump according to claim 5, it is characterized in that, described pass piston (25) has the bypass section (32) of an axis, and described bypass section has the outer diameter less than described guide section (31) and on its free end, constructs a bypass closing face (35).
7. external gear pump according to claim 6, is characterized in that, the axis of described guide section (31) stretches and stretches large than the axis of described bypass section (32).
8. according to the external gear pump of claim 6 or 7, it is characterized in that, described pass piston (25) has a ladder (33) between described guide section (31) and described bypass section (32), and described pass piston (25) utilizes described ladder backstop on described housing shoulder (30) when described bypass (40) is closed.
9. according to the external gear pump (1 one of the claims Suo Shu; 41) application, for sap pressure supply control gear.
10. application according to claim 9, is characterized in that, described hydraulic control device is the hydraulic control device of the automatic transmission of Motor Vehicle.
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 CN103026068A (en) | 2013-04-03 |
| CN103026068B true 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 |
| CN103026068A (en) | 2013-04-03 |
| 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160427 |