CN201092988Y - Hydraulic oil cylinder - Google Patents
Hydraulic oil cylinder Download PDFInfo
- Publication number
- CN201092988Y CN201092988Y CNU2007201147282U CN200720114728U CN201092988Y CN 201092988 Y CN201092988 Y CN 201092988Y CN U2007201147282 U CNU2007201147282 U CN U2007201147282U CN 200720114728 U CN200720114728 U CN 200720114728U CN 201092988 Y CN201092988 Y CN 201092988Y
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- CN
- China
- Prior art keywords
- piston
- piston rod
- rod
- hydraulic jack
- nut
- 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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- Actuator (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The utility model discloses a hydraulic cylinder, which comprises a cylinder (6), an end cover (1), a piston (4), a piston rod (5) and a sealing ring, wherein the end cover (1) is fixed on the end surface of the cylinder (6), and the piston (4) is positioned in the cylinder (6) and is fixedly connected with the piston rod (5). The piston (4) is fixedly connected with the piston rod (5), namely the piston (4) is tightly matched with a polished rod portion of the piston rod (5), a female screw (3) is partially screwed with a screw thread portion of the head portion of the piston rod (5), and a piston gland (2) is fixed with the female screw (3) and the piston (4). The structure which is adopted can effectively increase fatigue strength of screw thread on the connecting position between the piston and the piston rod, reduce change of components such as pistons, piston rods and the like, and thereby, cost is reduced.
Description
Technical field
The utility model relates to a kind of hydraulic jack, specifically is a kind of hydraulic jack that is used for large size plastic jetting-moulding device.
Background technique
Traditional hydraulic injection molding machine oil cylinder mainly comprises cylinder barrel, end cap, piston, piston rod, seal ring, and wherein piston generally adopts dual mode with being connected of piston rod, and a kind of is that piston and piston rod are cast as an integral body; Another kind is by screw thread piston and piston rod to be coupled together, and an end of piston leans against on the shaft shoulder of piston rod step.But in the hydraulic jack of large size plastic jetting-moulding device, if piston and piston rod are cast as an integral body, in course of working, difficulty will increase, and can increase the cost of part like this, finally causes the cost of injection machine to increase.And for the Placement of another kind of piston and piston rod, the assembler comes axially locating by the shaft shoulder of piston rod step, piston and piston rod with being threaded, like this in piston and the piston rod prolonged exercise process in hydraulic jack, it is tired that stretching one crooked compound stress wherein can cause the screw thread of joint to produce, particularly at the root of screw thread, stress is concentrated relatively, can crack, thereby damage piston or/and the screw thread of piston rod, just cause the replacing of part, also increased cost virtually.
The model utility content
Technical problem to be solved in the utility model is, provides a kind of easy to process, and the part exchanging rate is low to be the low hydraulic jack of cost.
For solving the problems of the technologies described above, the utility model hydraulic jack comprises cylinder barrel, end cap, piston, piston rod, seal ring, and described end cap is fixed on the end face of cylinder barrel, and described piston places in the cylinder barrel and with piston rod fixedlys connected.Described piston is fixedlyed connected with piston rod, is meant that tight with piston is combined in the polished rod portion of piston rod, and the helical thread portion of nut and piston rod head screws, and piston gland and nut, piston are fixed together.
Adopt the hydraulic jack of above structure, owing to increased a nut, promptly increased the number of turns that screw thread effectively connects, thereby reduced the fatigue stress of screw thread, protected piston better or/and the screw thread of piston rod reduces the turnover rate of part, thereby reduces cost.
The profile of described piston rod is for waiting external diameter cylindrical, and the piston rod thread part has a compensating groove with the junction of polished rod part, and this compensating groove is smooth arc.Adopt such structure, wait external diameter cylindrical, the stress rupture of having eliminated that the motion load brings the shaft shoulder that step is arranged because piston rod has been made.Owing to designed a smooth arc compensating groove in piston rod spiral shell portion, make screw pair when being subjected to stretching, shearing and crooked alternating stress again, compound stress disperses in compensating groove.These also equal to have protected better screw thread.
Described piston rod head has one to be the positioning head of one with piston rod, and this positioning head and piston gland are located by connecting, and there is a Cock screw at its place, location.After adopting this structure, piston gland and piston rod are connected as a single entity, thereby have kept the relative fixed between them.
One end of described nut has a conical step, and an end of piston has the concave surface that matches with this taper shape step.Adopt such structure, be because the compound stress that the motion load produces can make screw thread produce fatigue, Root Stress at screw thread is concentrated relatively, can crack, one end of nut is designed to conical step, concentrated stress is moved in the compensating groove on the piston rod, thereby has further avoided the generation of piston rod fatigue fracture.
Description of drawings
Accompanying drawing is the structure cross-sectional schematic of the utility model hydraulic jack.
Wherein, 1, end cap; 2, piston gland; 3, nut; 4, piston; 5, piston rod; 6, cylinder barrel; 7, compensating groove; 8, positioning head; 9, Cock screw.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
By the structure cross-sectional schematic of the utility model hydraulic jack shown in the drawings as can be known, the utility model hydraulic jack comprises cylinder barrel 6, end cap 1, piston 4, piston rod 5, seal ring, described end cap 1 is fixed on the end face of cylinder barrel 6, and described piston 4 places in the cylinder barrel 6 and with piston rod 5 fixedlys connected.Described piston 4 is fixedlyed connected with piston rod 5, be meant that piston 4 is a tight fit in the polished rod portion of piston rod 5, nut 3 is connected with the helical thread portion of piston rod 5 heads, and piston gland 2 is located by connecting with the positioning head 8 of piston rod 5 heads, and passes through screw together with nut 3, piston 4.Positioning head 8 is equipped with a Cock screw 9 with the place, location of piston gland 2, plays a piston rod 5 and the relatively-stationary effect of piston gland 2 maintenances.
One end of described nut 3 has a conical step, one end of piston 4 has the concave surface that matches with this taper shape step, be the concave surface that the conical step of nut 3 stretches into the piston 4 that profile with it matches, so just increased effective connection area of screw pair, thereby reduced the fatigue stress of nut.
The profile of described piston rod 5 changes step type piston rod in the past for waiting external diameter cylindrical, has eliminated the stress at the step place that the motion load brings and has concentrated.There is a compensating groove 7 junction of piston rod 5 helical thread portions and polished rod part, and this compensating groove 7 is smooth arc.This compensating groove 7 promptly can disperse screw pair that nut 3 is connected with piston rod 5 at the stress that is stretched, shears and produced during crooked alternation, the stress that produces when the nut 3 that can also disperse displacement to come is connected with piston 4 is concentrated, thereby has finally avoided the fatigue fracture of piston rod 5 thread roots.
Claims (4)
1. hydraulic jack, comprise cylinder barrel (6), end cap (1), piston (4), piston rod (5), seal ring, described end cap (1) is fixed on the end face of cylinder barrel (6), described piston (4) places in the cylinder barrel (6) and with piston rod (5) fixedlys connected, it is characterized in that: described piston (4) is fixedlyed connected with piston rod (5), be meant that piston (4) is a tight fit in the polished rod portion of piston rod (5), nut (3) screws with the helical thread portion of piston rod (5) head, and piston gland (2) is fixed together with nut (3), piston (4).
2. hydraulic jack according to claim 1 is characterized in that: the profile of described piston rod (5) is for waiting external diameter cylindrical, and there is a compensating groove (7) junction of piston rod (5) helical thread portion and polished rod part, and this compensating groove (7) is smooth arc.
3. hydraulic jack according to claim 1 and 2, it is characterized in that: described piston rod (5) head has one to be the positioning head of one (8) with piston rod (5), this positioning head (8) is located by connecting with piston gland (2), and there is a Cock screw (9) at its place, location.
4. hydraulic jack according to claim 1 is characterized in that: an end of described nut (3) has a conical step, and an end of piston (4) has the concave surface that matches with this taper shape step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201147282U CN201092988Y (en) | 2007-09-10 | 2007-09-10 | Hydraulic oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201147282U CN201092988Y (en) | 2007-09-10 | 2007-09-10 | Hydraulic oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201092988Y true CN201092988Y (en) | 2008-07-30 |
Family
ID=39900954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201147282U Expired - Fee Related CN201092988Y (en) | 2007-09-10 | 2007-09-10 | Hydraulic oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201092988Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305289A (en) * | 2011-08-04 | 2012-01-04 | 武汉科技大学 | Gap seal hydraulic cylinder based on deformable piston ring |
| CN102390705A (en) * | 2011-06-12 | 2012-03-28 | 江苏维达机械有限公司 | Exhaust push rod |
| CN102434522A (en) * | 2011-11-09 | 2012-05-02 | 中国重型机械研究院有限公司 | Hydraulic cylinder for adjusting axial position of piston and cylinder body through spherical surface |
| CN102658320A (en) * | 2012-05-30 | 2012-09-12 | 江苏扬力数控机床有限公司 | Hydraulic cylinder of numerical-control turret punch press |
| CN102720726A (en) * | 2012-06-15 | 2012-10-10 | 常州液压成套设备厂有限公司 | Hydraulic cylinder with detachable sealing structure |
| CN102773449A (en) * | 2011-05-10 | 2012-11-14 | 宜兴市佳晨压铸机制造有限公司 | Die-casting machine pull rod with deloading groove |
| CN105114389A (en) * | 2015-07-27 | 2015-12-02 | 柳州柳工液压件有限公司 | Hydraulic oil cylinder |
| CN105650057A (en) * | 2016-04-01 | 2016-06-08 | 武汉科技大学 | Dustproof device of working roller balance oil cylinder self-defense block |
| CN105840580A (en) * | 2016-06-23 | 2016-08-10 | 余荣幸 | Sealing device for hydraulic oil cylinder of vertical type steel ball lapping machine |
-
2007
- 2007-09-10 CN CNU2007201147282U patent/CN201092988Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773449A (en) * | 2011-05-10 | 2012-11-14 | 宜兴市佳晨压铸机制造有限公司 | Die-casting machine pull rod with deloading groove |
| CN102390705A (en) * | 2011-06-12 | 2012-03-28 | 江苏维达机械有限公司 | Exhaust push rod |
| CN102305289A (en) * | 2011-08-04 | 2012-01-04 | 武汉科技大学 | Gap seal hydraulic cylinder based on deformable piston ring |
| CN102434522A (en) * | 2011-11-09 | 2012-05-02 | 中国重型机械研究院有限公司 | Hydraulic cylinder for adjusting axial position of piston and cylinder body through spherical surface |
| CN102434522B (en) * | 2011-11-09 | 2015-01-28 | 中国重型机械研究院有限公司 | Hydraulic cylinder for adjusting axial position of piston and cylinder body through spherical surface |
| CN102658320A (en) * | 2012-05-30 | 2012-09-12 | 江苏扬力数控机床有限公司 | Hydraulic cylinder of numerical-control turret punch press |
| CN102658320B (en) * | 2012-05-30 | 2014-04-09 | 江苏扬力数控机床有限公司 | Hydraulic cylinder of numerical-control turret punch press |
| CN102720726A (en) * | 2012-06-15 | 2012-10-10 | 常州液压成套设备厂有限公司 | Hydraulic cylinder with detachable sealing structure |
| CN105114389A (en) * | 2015-07-27 | 2015-12-02 | 柳州柳工液压件有限公司 | Hydraulic oil cylinder |
| CN105650057A (en) * | 2016-04-01 | 2016-06-08 | 武汉科技大学 | Dustproof device of working roller balance oil cylinder self-defense block |
| CN105650057B (en) * | 2016-04-01 | 2017-05-24 | 武汉科技大学 | Dustproof device of working roller balance oil cylinder self-defense block |
| CN105840580A (en) * | 2016-06-23 | 2016-08-10 | 余荣幸 | Sealing device for hydraulic oil cylinder of vertical type steel ball lapping machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Ningbo Aomate Precision Power Press Co., Ltd. Assignor: Xia Shanhai Contract fulfillment period: 2008.9.8 to 2013.9.30 Contract record no.: 2008990000418 Denomination of utility model: Hollow plunger hydraulic cylinder Granted publication date: 20080730 License type: Exclusive license Record date: 20080918 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.9.8 TO 2013.9.30 Name of requester: NINGBO O MART HIGH-PRECISION STAMPING MACHINE TOO Effective date: 20080918 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080730 Termination date: 20110910 |