CN2228868Y - Hydraulic pump - Google Patents
Hydraulic pump Download PDFInfo
- Publication number
- CN2228868Y CN2228868Y CN 95221159 CN95221159U CN2228868Y CN 2228868 Y CN2228868 Y CN 2228868Y CN 95221159 CN95221159 CN 95221159 CN 95221159 U CN95221159 U CN 95221159U CN 2228868 Y CN2228868 Y CN 2228868Y
- Authority
- CN
- China
- Prior art keywords
- piston
- seal ring
- compensation
- hydraulic pump
- pistons
- 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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Abstract
The utility model relates to a hydraulic pump, particularly a hydraulic pump used for a brake master cylinder or a clutch master pump of a car, which comprises a pump body. Pistons are arranged in an oil chamber of the pump body, and the pistons are sheathed with seal rings. The oil chamber is communicated with a liquid storing chamber through compensating holes. The utility model has the essential structure that the pistons in the section of stepped outline toward the direction of an oil pressure chamber are sheathed orderly with compensating sleeves and seal rings. The seal rings and the compensating sleeves are pressed to the pistons axially by resilient devices. The axial position of the compensating sleeves in the quiescent state is limited axially by a position limit device raised from the inner wall of the oil chamber.
Description
The utility model relates to a kind of Hydraulic Pump, especially for vehicle braked master cylinder or clutch master cylinder.
The 274th～275 page of " automobile construction " volume two that People's Transportation Press publishes June nineteen ninety discloses a kind of Hydraulic Pump, and it comprises: the pump housing, in the oil pocket of the pump housing piston is housed, and be with seal ring on the piston, oil pocket is connected with fluid storage compartment through compensation orifice.Problem is that the pumping cavity that is arranged in piston stroke also has a by-pass prot that is connected with fluid storage compartment, the acute angle burr of this hole and oil pocket perforation place are often pulled rubber seal, in the course of time just form one little " ditch ", thereby cause brake-pressure to be difficult to set up in the outer radius of seal ring.Be 30,000 the service life of homemade seal ring.For addressing this problem, Chinese patent 91209427.3 disclosed a kind of " Hydraulic Pump ", and its solution is with a kind of special-purpose chamfering machine, gave this Hole chamfering, though it can increase substantially the service life of seal ring, but still can not finally deal with problems.
For this reason, the purpose of this utility model is to provide a kind of Hydraulic Pump, and it satisfies the requirement of compensation braking liquid or off-load with a kind of new structure, and can make seal ring become a kind of non-easy worn part.
The technical solution of the utility model is when comprising aforementioned formation, its distinctive feature is: be step-like outline section at piston, overlapping compensation cover and seal ring towards pumping cavity direction sky successively, springing is from axially pressing to piston with seal ring, compensation cover, from the inhibiting device of the oil pocket inwall projection axial location when the axial restraint compensation is enclosed within quiescence.
And the cross section of seal ring can be " D " shape.
In the technical program, because of compensating cover and seal ring is that sky is enclosed within on the piston, radially just all the time and certain clearance arranged between the piston, piston and sealing (closing compensation channels) between compensation cover and the seal ring are to rely on the radial end face of piston stepped configuration section and compensation to overlap or the contact matching of seal ring realizes.When piston was in return of stroke, pumping cavity formed vacuum, overcomes spring force, and the radial end face of compensation cover and seal ring and piston is disengaged, and promptly the compensation channels of operating fluid through forming therefrom flows to pumping cavity from compensation orifice.When piston turns back to quiescence (off working state), inhibiting device has retrained the axial location of compensation cover, makes the compensation cover still not contact with described radial end face with seal ring, so just continue to finish compensation or off-load through compensation channels.When piston was in forced stroke, external force was to pumping cavity direction propelling piston, and the compensation cover leaves inhibiting device, and springing will compensate the radial end face that cover is pressed on piston by seal ring, and the gap is eliminated, so pumping cavity is promptly set up operation pressure.Because pumping cavity does not have by-pass prot, will be not less than 1,000,000 the service life that seal ring is tested in the footpath.
The utility model is described in further detail below with reference to accompanying drawing.
Fig. 1 is the cutaway view of this Hydraulic Pump.
Fig. 2 is the profile of seal ring.
With reference to Fig. 1, this Hydraulic Pump can have two kinds of list or two-chambers (pumping cavity), and what Fig. 1 provided is the complicated two-chamber of structure, and only there are a piston and a pumping cavity in single chamber, the two structural similitude, not accompanying drawing in addition.
This Hydraulic Pump comprises the pump housing 1, in the oil pocket 4 of the pump housing 1 piston 3 is housed, be with seal ring 9 on the piston 3, oil pocket 4 footpath compensation orifices 2 are connected with fluid storage compartment ( arrow 12,13 leads to fluid storage compartment), the outline section that is stepped appearance 6 at piston 1, overlapping compensation cover 8 and seal ring 9 towards pumping cavity 5 directions sky successively, springing 10 is from axially pressing to piston with seal ring 9, compensation cover 8, and described springing 10 can be a spring.The spring perch 11 that is contained on the piston 3 keeps from axially being pressed in the outer face of seal ring 9 this spring.From the inhibiting device 7 of oil pocket 4 inwall projectioies from axial restraint compensation cover 8 axial location during in quiescence.Inhibiting device 7 can be from radially passing stop screw or the locating dowel pin that the pump housing 1 extends to oil pocket 4.
The cross section of seal ring 9 is " D " type (see figure 2).The external diameter of seal ring 9 should have certain magnitude of interference with cooperating of pumping cavity 5 internal diameters.
The working process of this Hydraulic Pump in the narration of preamble combination technology effect, is not given unnecessary details at this.
Claims (2)
1, a kind of Hydraulic Pump, in particular for vehicle braked master cylinder or clutch master cylinder, comprise: the pump housing [1], the oil pocket of the pump housing [1] [4 ］ in be equipped with piston [3 ］, be with seal ring [9] on the piston [3], oil pocket [4] is connected with fluid storage compartment through compensation orifice [2], it is characterized in that: the outline section that is stepped appearance [6] at piston [3], towards pumping cavity [5] direction sky successively overlapping compensation cover [8] and seal ring [9 ］, springing [10 ］ from axially with seal ring [9], compensation cover [8] is pressed to piston [3], the axial location when the inhibiting device [7] of oil pocket [5] inwall projection overlaps [8] in quiescence from the axial restraint compensation.
2, Hydraulic Pump according to claim 1 is characterized in that: the cross section of seal ring [9] is " D " shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95221159 CN2228868Y (en) | 1995-09-04 | 1995-09-04 | Hydraulic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95221159 CN2228868Y (en) | 1995-09-04 | 1995-09-04 | Hydraulic pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2228868Y true CN2228868Y (en) | 1996-06-12 |
Family
ID=33868854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95221159 Expired - Fee Related CN2228868Y (en) | 1995-09-04 | 1995-09-04 | Hydraulic pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2228868Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434608A (en) * | 2011-09-24 | 2012-05-02 | 芜湖众发汽车制动系统有限公司 | Dual-piston brake main cylinder with oil outlet connector at lateral side and oil supplementing ring |
| CN102506102A (en) * | 2011-09-24 | 2012-06-20 | 芜湖众发汽车制动系统有限公司 | Double-piston brake master cylinder with oil supplementing ring and limit pins at oil inlets |
| CN103231652A (en) * | 2013-04-28 | 2013-08-07 | 长城汽车股份有限公司 | Clutch system used for automobile and automobile with same |
-
1995
- 1995-09-04 CN CN 95221159 patent/CN2228868Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434608A (en) * | 2011-09-24 | 2012-05-02 | 芜湖众发汽车制动系统有限公司 | Dual-piston brake main cylinder with oil outlet connector at lateral side and oil supplementing ring |
| CN102506102A (en) * | 2011-09-24 | 2012-06-20 | 芜湖众发汽车制动系统有限公司 | Double-piston brake master cylinder with oil supplementing ring and limit pins at oil inlets |
| CN103231652A (en) * | 2013-04-28 | 2013-08-07 | 长城汽车股份有限公司 | Clutch system used for automobile and automobile with same |
| CN103231652B (en) * | 2013-04-28 | 2016-08-10 | 长城汽车股份有限公司 | For the clutch system of automobile and the automobile with it |
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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 |