CN2202202Y - External-engaged medium-high pressure gear pump - Google Patents
External-engaged medium-high pressure gear pump Download PDFInfo
- Publication number
- CN2202202Y CN2202202Y CN 94241139 CN94241139U CN2202202Y CN 2202202 Y CN2202202 Y CN 2202202Y CN 94241139 CN94241139 CN 94241139 CN 94241139 U CN94241139 U CN 94241139U CN 2202202 Y CN2202202 Y CN 2202202Y
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- CN
- China
- Prior art keywords
- shaft
- hole
- gear shaft
- pump
- 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.)
- Expired - Fee Related
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- Rotary Pumps (AREA)
Abstract
The utility model provides the technical proposal of an external-engaged medium-high pressure gear pump. The scheme is characterized in that an oil return passage is provided with a one-way oil pressure buffer valve, and the through hole of a master gear and the shaft hole of the master gear are processed on the shaft of the master gear. After the scheme is adopted, the oil seal of the output shaft of the gear pump can not be damaged by the high-pressure return oil of a hydraulic system. The external-engaged medium-high pressure gear pump reduces requirements for the hydraulic system, and enlarges working pressure range.
Description
The utility model relates to liquid pump, the outer gearing mesohigh gear pump of especially using in the hydraulic system.
In existing external gear pump, the shaft oil sealing on its front pump cover generally can only bear lower working pressure, but the shaft oil sealing inner chamber of this oil sealing inboard then directly communicates with oil suction chamber by drainback passage.Therefore, because hydraulic system is at work, for example unloading suddenly, can cause the pressure moment rising of gear pump oil suction chamber, this pressure acts on shaft oil sealing on the front pump cover by drainback passage, will cause the damage of this oil sealing, influences the proper functioning of hydraulic system.This also is a prior art institute open question.
The purpose of this utility model; be exactly according to the existing in prior technology problem; improved on the basis of existing technology; and provide a kind of hydraulic shock absorber that in drainback passage, increases; alleviate the oil suction chamber effect of pressure that jump to the shaft oil sealing; protection shaft oil sealing is avoided damaging, and can reduce the requirement to hydraulic system, enlarges the outer gearing mesohigh gear pump of the working pressure scope of external gear pump.
The purpose of this utility model realizes by following technical measures.The main outer gearing mesohigh gear pump that constitutes by front pump cover 10, the pump housing 14, rear pump cover 17, main gear shaft 15 and driven gear shaft 1.The characteristics of the technical program are that unidirectional oleo cushion valve 4 is housed in drainback passage 7; On the main gear shaft 15 at shaft oil sealing back cavity 9 places of shaft oil sealing 8 inboards of main gear shaft 15, vertical axis is processed with radially main gear shaft through hole 11; Be processed with axial master gear axis hole 12 at the upper edge, main gear shaft 15 axle center of rear pump cover spindle nose hole 16 ends axis again, this master gear axis hole 12 communicates with main gear shaft through hole 11.In addition, the technical program also has following characteristics, is that promptly described unidirectional oleo cushion valve 4 is to press a spring 5 by valve core 6, has the axle center to have the valve stifled 3 of through hole to constitute in the other end envelope of spring 5.And described valve core 6 is steel balls.
After adopting the technical program to transform on the existing external gear pump, when the gear pump lubricant oil in the pump and pressure oil of leakage during, enter drainback passage by shaft oil sealing back cavity in proper functioning, the unidirectional oleo cushion valve of forward flowing through enters oil suction chamber.When instantaneous pressure appears in the oil return of hydraulic system; this high pressure oil enters oil suction chamber in the pump, will the unidirectional oleo cushion valve in the drainback passage cut out to the drainback passage adverse current; high pressure oil can't enter shaft oil sealing back cavity, so protected the shaft oil sealing not to be subjected to the damage of high pressure oil.The oil at the forward and backward two ends of pump then carried out balance automatically by master gear axis hole and master gear through hole when drainback passage was closed, and made gear pump be unlikely to cause eccentric wear.This shows that the technical program can make the gear pump oil suction chamber bear certain compression shock, thus can simplify requirement to hydraulic system, and can improve the range of working pressure that gear pump is suitable for, compared with prior art its effect is conspicuous.
Description of drawings:
Fig. 1 is the utility model embodiment's a structure cross-sectional schematic.
Now pass through a specific embodiment, and, the utility model is further elaborated in conjunction with its accompanying drawing.Outer gearing mesohigh gear pump is to support main gear shaft 15 and driven gear shaft 1 by bearing 13 in front pump cover 10, the pump housing 14, rear pump cover 17, and main gear shaft 15 stretches out after being sealed by shaft oil sealing 8 by front pump cover 10.The technical program is equipped with unidirectional oleo cushion valve 4 in drainback passage 7, this unidirectional oleo cushion valve 4 is that inwall with drainback passage 7 is as valve body, with a steel ball as valve core 6, on the steel ball, press a spring 5, and have the valve stifled 3 of through hole to seal spring 5 formations with an axle center at the other end of spring 5.Other is on the main gear shaft 15 at shaft oil sealing back cavity 9 places of shaft oil sealing 8 inboards of main gear shaft 15, and vertical axis is processed with radially main gear shaft through hole 11; Be processed with axial master gear axis hole 12 at the upper edge, main gear shaft 15 axle center of rear pump cover spindle nose hole 16 ends axis again, this master gear axis hole 12 communicates with main gear shaft through hole 11.The gear pump of the technical program is under the situation of hydraulic system proper functioning, and the lubricant oil in the pump and the pressure oil of leakage enter drainback passage 7 by shaft oil sealing back cavity 9, and the unidirectional oleo cushion valve 4 of forward flowing through enters oil suction chamber through side plate spill port 2 again.When instantaneous pressure appears in the oil return of hydraulic system; this high pressure oil enters oil suction chamber in the pump, will the unidirectional oleo cushion valve 4 in the drainback passage 7 cut out to drainback passage 7 adverse currents; high pressure oil can't enter shaft oil sealing back cavity 9, so protected shaft oil sealing 8 not to be subjected to the damage of high pressure oil.The oil at the forward and backward two ends of pump then carried out balance automatically by master gear axis hole 12 and master gear through hole 11 when drainback passage was closed, and was unlikely to cause eccentric wear to guarantee gear pump.As seen, the technical program can make the gear pump oil suction chamber bear certain compression shock, thus can simplify requirement to hydraulic system, and can improve the range of working pressure that gear pump is suitable for.
Claims (3)
1, outer gearing mesohigh gear pump mainly is to be made of front pump cover [10], the pump housing [14], rear pump cover [17], main gear shaft [15] and driven gear shaft [1], feature of the present utility model be
1.1. unidirectional oleo cushion valve [4] is housed in the drainback passage [7];
1.2. on the main gear shaft [15] that the inboard shaft oil sealing back cavity [9] of the shaft oil sealing [8] of main gear shaft [15] is located, vertical axis is processed with radially main gear shaft through hole [11]; Exist again
1.3. main gear shaft [15] upper edge, the axle center axis of rear pump cover spindle nose hole [16] end is processed with axial master gear axis hole [12], this master gear axis hole [12] communicates with main gear shaft through hole [11].
2, gear pump according to claim 1 is characterized in that described unidirectional oleo cushion valve ［ 4 ］ is to press a spring ［ 5 ］ by valve core ［ 6 ］, has the axle center to have the valve stifled ［ 3 ］ of through hole to constitute in the other end envelope of spring ［ 5 ］.
3, gear pump according to claim 2 is characterized in that described valve core ［ 6 ］ is a steel ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94241139 CN2202202Y (en) | 1994-08-18 | 1994-08-18 | External-engaged medium-high pressure gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94241139 CN2202202Y (en) | 1994-08-18 | 1994-08-18 | External-engaged medium-high pressure gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2202202Y true CN2202202Y (en) | 1995-06-28 |
Family
ID=33847981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94241139 Expired - Fee Related CN2202202Y (en) | 1994-08-18 | 1994-08-18 | External-engaged medium-high pressure gear pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2202202Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586561B (en) * | 2009-05-22 | 2011-12-28 | 王良仁 | High pressure gear oil pump |
| CN102667159A (en) * | 2009-12-23 | 2012-09-12 | 英特普工程有限公司 | A geared hydraulic machine |
| CN105370564A (en) * | 2015-11-24 | 2016-03-02 | 徐州科源液压股份有限公司 | Gear pump front cover with overflow protecting function |
| CN109915360A (en) * | 2019-03-22 | 2019-06-21 | 陈扬珑 | Two-way gear oil pump |
-
1994
- 1994-08-18 CN CN 94241139 patent/CN2202202Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586561B (en) * | 2009-05-22 | 2011-12-28 | 王良仁 | High pressure gear oil pump |
| CN102667159A (en) * | 2009-12-23 | 2012-09-12 | 英特普工程有限公司 | A geared hydraulic machine |
| CN105370564A (en) * | 2015-11-24 | 2016-03-02 | 徐州科源液压股份有限公司 | Gear pump front cover with overflow protecting function |
| CN109915360A (en) * | 2019-03-22 | 2019-06-21 | 陈扬珑 | Two-way gear oil pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |