CN102765674A - Piston rod and cylinder body matched structure for hydraulic jack - Google Patents
Piston rod and cylinder body matched structure for hydraulic jack Download PDFInfo
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- CN102765674A CN102765674A CN2012102280046A CN201210228004A CN102765674A CN 102765674 A CN102765674 A CN 102765674A CN 2012102280046 A CN2012102280046 A CN 2012102280046A CN 201210228004 A CN201210228004 A CN 201210228004A CN 102765674 A CN102765674 A CN 102765674A
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- piston rod
- cylinder
- orienting sleeve
- hydraulic jack
- engaging body
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Abstract
The invention discloses a piston rod and cylinder body matched structure for a hydraulic jack and belongs to the technical field of hydraulic jacks. The hydraulic jack comprises a foundation, a top cap and an outer sleeve; the piston rod and cylinder body matched structure comprises an oil cylinder and a piston rod body; the lower end of the oil cylinder is fixed with the foundation; the upper end of the oil cylinder is fixed with the top cap; an oil storage cavity is formed between the outer wall of the oil cylinder and the inner wall of the outer sleeve; the lower end of the piston rod body is provided with a piston rod bottom step; the lower part of the piston rod bottom step is extended to form a piston rod body sealing seat; and the piston rod body sealing seat is sleeved with a sealing ring. The piston rod and cylinder body matched structure has the advantages that a gap is reserved between the piston rod bottom step and the wall body of a cylinder cavity, a guide sleeve step is expanded above the piston rod bottom step, and a guide sleeve is sleeved on the guide sleeve step and is matched with the wall body of the cylinder cavity, is extended to the gap and sleeved on the piston rod bottom step, and directly or indirectly contacts the sealing ring. The piston rod and cylinder body matched structure has the advantages of prolonging the service life of the hydraulic jack and guaranteeing safety.
Description
Technical field
The invention belongs to the hydraulic jack technical field, be specifically related to a kind of piston rod and cylinder body fit structure of hydraulic jack
Background technology
can be seen in disclosed Chinese patent document about the technical information of hydraulic jack in a large number; Slightly with give an example like Granted publication CN2294946Y (using the vertical hydraulic jack), CN2309324Y (hydraulic jack), CN2851229Y (the unloaded hydraulic jack that rises soon), CN200940084Y (the vertical jack of dual-speed hydraulic), CN101362582B (hydraulic jack that can support for a long time) and CN201473265U (vertical oil jack) more, or the like.
The piston rod and the cylinder body fit structure of the hydraulic jack that give an example above being not limited to
can be by shown in Figure 4; Hydraulic jack comprises base 1, top cap 2 and overcoat 3; The lower end of overcoat 3 is fixed on the base 1; And upper end and top cap 2 are fixing; Piston rod and cylinder body fit structure comprise oil cylinder 4 and piston rod body 5; The lower end of oil cylinder 4 and base 1 are fixing, and upper end and top cap 2 are fixing, and constitute oil storage chamber 6 between the inwall of the outer wall of oil cylinder 4 and overcoat 3; Piston rod body 5 is positioned at the cylinder chamber 41 of oil cylinder 4; Constitute that be used for the inwall of oil cylinder 4 match and the piston rod bottom stage 51 that with the inwall of oil cylinder 4 contact of a diameter in the lower end of piston rod body 5, be extended with the piston rod body seal receptacle 52 of diameter in the bottom of this piston rod bottom stage 51, be arranged with seal ring 521 that the cylinder chamber 41 that forms sealing between the inwall that is used to make piston rod body 5 and oil cylinder 4 and make oil cylinder 4 is divided into epicoele and cavity of resorption and the cup holding ring 522 that is used for and top that be positioned at seal ring 521 qualification on this piston body seal receptacle 52 seal ring 521 less than the diameter of piston rod bottom stage 51 greater than the diameter of piston rod body 5.
according to common practise, and under the work of the oil pump of hydraulic jack, the oil ducts of the hydraulic oil in the oil storage chamber 6 on base 1 get into the cavity of resorption in the cylinder chamber 41 of oil cylinder 4; It is up to promote piston rod body 5 by hydraulic oil, and promptly piston rod body 5 stretches out outside cylinder chamber 41, realizes the lifting to weight; Otherwise; Hydraulic oil under the effect of pressure-relief valve in the cavity of resorption in cylinder chamber 41 returns into oil storage chamber 6, and piston rod body 5 is descending, i.e. retraction (resetting) in cylinder chamber 41.
are by said structure and combine above-mentioned explanation to know; No matter be that piston rod body 5 is up or descending; Because the surface of the circumferencial direction of piston rod bottom stage 51 promptly contacts with cylinder chamber 41 with the inwall of oil cylinder 4; Therefore produce friction with cylinder chamber 41 and to 41 damages of cylinder chamber, when the wall to cylinder chamber 41 wore up to the degree of not hoping to occur, hydraulic jack was just accused and is died.Because the situation that is worn in cylinder chamber 41 continues to use the lifting speed that can influence piston rod body 5 on the one hand, can cause safety misadventure on the other hand.
In view of above-mentioned prior art, be necessary to improve, the applicant has done useful design for this reason, and the technical scheme that will introduce below produces under this background
Summary of the invention
task of the present invention is to provide between the cylinder chamber of a kind of piston rod bottom stage that helps to stop the piston rod body and oil cylinder and produces friction and use piston rod and the cylinder body fit structure that ensures the service life and the hydraulic jack of safety.
task of the present invention is accomplished like this; A kind of piston rod of hydraulic jack and cylinder body fit structure; Described hydraulic jack comprise base, top cap and between base and top cap and with base and the fixing overcoat of top cap; Described piston rod and cylinder body fit structure comprise oil cylinder and piston rod body; The lower end and the base of oil cylinder are fixed; The upper end is fixed with the top cap, and constitutes oil storage chamber between the inwall of the outer wall of oil cylinder and overcoat, and the piston rod body is positioned at the cylinder chamber of oil cylinder; Constitute the piston rod bottom stage of a diameter greater than the diameter of piston rod body in the lower end of piston rod body; Be extended with the piston rod body seal receptacle of a diameter less than the diameter of piston rod bottom stage in the bottom of this piston rod bottom stage, form leak free between the wall body that is used to make piston rod body and cylinder chamber and make the cylinder chamber be divided into the seal ring of epicoele and cavity of resorption being arranged with on this piston rod body seal receptacle, characteristics are: maintain the space between the wall body in described piston rod bottom stage and said cylinder chamber; And above this piston rod bottom stage, expand to establish and constitute an orienting sleeve step; On this orienting sleeve step, be equipped with an orienting sleeve, the wall body bearing fit in this orienting sleeve and cylinder chamber, and this orienting sleeve also extends to described space and is placed on the piston rod bottom stage and contacts with described seal ring directly or indirectly.
are in a concrete embodiment of the present invention; Described orienting sleeve is made up of first engaging body and second engaging body jointly; First engaging body is placed on the described sealing orienting sleeve step; And second engaging body is nested with on described piston rod bottom stage in the position corresponding to described space, and contacts with described seal ring indirectly.
are in another concrete embodiment of the present invention; Described orienting sleeve is made up of first, second engaging body and the 3rd engaging body jointly; First engaging body is nested with on described sealing orienting sleeve step; Second engaging body is nested with on described piston rod bottom stage in the position corresponding to described space, and the 3rd engaging body is positioned at the below of second engaging body and directly contacts with described seal ring.
in another concrete embodiment of the present invention, the thickness of described second engaging body is than the thicker of first engaging body.
In another concrete embodiment of the present invention, the thickness of described second engaging body equates with the width in said space
.
also have among the concrete embodiment of the present invention, and described orienting sleeve is nonmetallic.
are more of the present invention and among concrete embodiment, described non-metal is rubber, nylon or plastics.
technical scheme provided by the invention is owing to make between the wall body in piston rod bottom stage and cylinder chamber of bottom of piston rod body and kept the space; And above the piston rod bottom stage, expand and be provided with an orienting sleeve step; On the orienting sleeve step, be nested with the orienting sleeve that cooperates with the cylinder chamber; And this orienting sleeve extends to the space and is nested with on the piston rod bottom stage; Thereby can avoid when piston rod body up-and-down movement and the wall body friction in the cylinder chamber of oil cylinder, protect oil cylinder effectively and use the service life that prolongs hydraulic jack and ensure the safety in using.
Description of drawings
Fig. 1 is a cutaway view of the present invention.
Fig. 2 is that first of orienting sleeve shown in Figure 1 is implemented illustration.
Fig. 3 is that second of orienting sleeve is implemented illustration.
Fig. 4 is the piston rod and the cylinder body matching chart of the hydraulic jack in the prior art.
The specific embodiment
Embodiment 1:
see also Fig. 1, have provided base 1, top cap 2 and the overcoat 3 of hydraulic jack, and the lower end of overcoat 3 and base 1 are fixing, and captive joint with top cap 2 in the upper end.Piston rod provided by the invention and cylinder body fit structure comprise oil cylinder 4 and piston rod body 5; Oil cylinder 4 is positioned at overcoat 3; And and constitute oil storage chamber 6 between the overcoat 3; Oil storage chamber 6 communicates with the cylinder chamber 41 of oil cylinder 4 through the oil duct that is opened on the base 1, and the lower end of oil cylinder 4 and base 1 are fixing, and captives joint with top cap 3 equally in the upper end.Constitute the diameter piston rod bottom stage 51 bigger in the bottom (also can claim the lower end) of piston rod body 5 than the diameter of piston rod body 5; And below piston rod bottom stage 51, constitute the diameter piston rod body seal receptacle 52 littler than the diameter of piston rod bottom stage 51; On this piston rod body seal receptacle 52, be arranged with seal ring 521; Play the sealing function with cylinder chamber 41 by sealing circle 521, and cylinder chamber 41 is divided into epicoele and cavity of resorption.In addition, on piston rod body seal receptacle 52, also be arranged with one and be used for the cup holding ring 522 spacing to aforesaid seal ring 521, this cup holding ring 522 contacts with seal ring 521 and is positioned at the top of seal ring 521.
are asked for an interview Fig. 2 and are continued to combine Fig. 1; Main points as technical scheme provided by the invention: maintain the space around the aforesaid piston rod bottom stage 51 and between the wall body in the cylinder chamber 41 of oil cylinder 4; And above corresponding to piston rod bottom stage 51, constitute the diameter orienting sleeve step 511 bigger than the diameter of piston rod bottom stage 51; On this orienting sleeve step 511, be arranged with an orienting sleeve 8; This orienting sleeve 8 cooperates (bearing fit) with the chamber wall in cylinder chamber 41, and this orienting sleeve 8 also extends in the aforesaid space 7 and be placed on the piston rod bottom stage 51, that is to say that space 7 is by orienting sleeve 8 compensation.
By illustrated in figures 1 and 2, orienting sleeve 8 is made up of first engaging body 81 and second engaging body 82 jointly
, and first engaging body 81 is nested with on orienting sleeve step 511, and second engaging body 82 is placed on the piston rod bottom stage 51.Because aforesaid space 7 is filled up by second engaging body 82 in fact, therefore for prior art, piston rod bottom stage 51 is harmonious with cylinder chamber 41 through second engaging body 82 of orienting sleeve 8.Because the material of orienting sleeve 8 is a non-metallic material, present embodiment is selected and is used rubber, but also can use the orienting sleeve of nylon or plastic material, thereby can not undermine the chamber wall in cylinder chamber 41 because of friction.Shown in figure, the thickness of second engaging body 82 (wall thickness) is thicker than first engaging body 81, and the width in the thickness of first engaging body 82 and space 7 is suitable.In the present embodiment; Because aforesaid second engaging body 82 and seal ring 521 indirect contacts; Therefore be arranged with a cup holding ring 522 on the piston rod body seal receptacle 52 and above, thereby second engaging body 82 is contacted with cup holding ring 522, be i.e. second engaging body 82 and seal ring 521 indirect contacts corresponding to seal ring 521; More particularly, second engaging body 82 contacts with seal ring 521 by means of the transition of cup holding ring 522.
Embodiment 2:
see also Fig. 3; This figure has provided the situation of orienting sleeve 8 with seal ring 521 direct contacts; Orienting sleeve 8 is made up of first, second engaging body 81,82 and the 3rd engaging body 83 jointly; The 3rd engaging body 83 is positioned at the below of second engaging body 82, and directly contacts with seal ring 521, and is spacing to seal ring 521.In the present embodiment, saved the cup holding ring of mentioning among the embodiment 1 522, all the other are all with the description to embodiment 1.
In sum, technical scheme provided by the invention has overcome the shortcoming in the prior art, has accomplished the invention task, and has objectively embodied the technique effect described in the superincumbent technique effect hurdle
Claims (7)
1. the piston rod and the cylinder body fit structure of
a kind of hydraulic jack; Described hydraulic jack comprise base (1), top cap (2) and be positioned at base (1) and top cap (2) between and with the fixing overcoat (3) of base (1) and top cap (2); Described piston rod and cylinder body fit structure comprise oil cylinder (4) and piston rod body (5); The lower end of oil cylinder (4) and base (1) are fixing; The upper end is fixing with top cap (2); And constitute oil storage chamber (6) between the inwall of the outer wall of oil cylinder (4) and overcoat (3); Piston rod body (5) is positioned at the cylinder chamber (41) of oil cylinder (4); Constitute the piston rod bottom stage (51) of a diameter greater than the diameter of piston rod body (5) in the lower end of piston rod body (5); Be extended with the piston rod body seal receptacle (52) of a diameter in the bottom of this piston rod bottom stage (51), form leak free between the wall body that is used to make piston rod body (5) and cylinder chamber (41) and make cylinder chamber (41) be divided into the seal ring (521) of epicoele and cavity of resorption being arranged with on this piston rod body seal receptacle (52), it is characterized in that: maintain space (7) between the wall body in described piston rod bottom stage (51) and said cylinder chamber (41) less than the diameter of piston rod bottom stage (51); And expand to establish in the top of this piston rod bottom stage (51) and constitute an orienting sleeve step (511); On this orienting sleeve step (511), be equipped with an orienting sleeve (8), the wall body bearing fit in this orienting sleeve (8) and cylinder chamber (41), and this orienting sleeve (8) also extends to described space (7) and is placed on the piston rod bottom stage (51) and contacts with described seal ring (521) directly or indirectly.
2. the piston rod and the cylinder body fit structure of
hydraulic jack according to claim 1; It is characterized in that described orienting sleeve (8) is by first engaging body (81) and the common formation of second engaging body (82); First engaging body (81) is placed on the described sealing orienting sleeve step (511); And second engaging body (82) is nested with on described piston rod bottom stage (51) in the position corresponding to described space (7), and contacts with described seal ring (521) indirectly.
3. the piston rod and the cylinder body fit structure of
hydraulic jack according to claim 1; It is characterized in that described orienting sleeve (8) is by first, second engaging body (81,82) and the common formation of the 3rd engaging body (83); First engaging body (81) is nested with on described sealing orienting sleeve step (511); Second engaging body (82) is nested with on described piston rod bottom stage (51) in the position corresponding to described space (7), and the 3rd engaging body (83) is positioned at the below of second engaging body (82) and directly contacts with described seal ring (521).
4.
is characterized in that the thicker of the thickness of described second engaging body (82) than first engaging body (81) according to the piston rod and the cylinder body fit structure of claim 2 or 3 described hydraulic jacks.
5.
is characterized in that according to the piston rod and the cylinder body fit structure of claim 2 or 3 described hydraulic jacks the thickness of described second engaging body (82) equates with the width in said space 7.
6. the piston rod and the cylinder body fit structure of
hydraulic jack according to claim 1 is characterized in that described orienting sleeve (8) is nonmetallic.
7.
The piston rod of hydraulic jack according to claim 6 and cylinder body fit structure is characterized in that described non-metal is rubber, nylon or plastics
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102280046A CN102765674A (en) | 2012-07-04 | 2012-07-04 | Piston rod and cylinder body matched structure for hydraulic jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102280046A CN102765674A (en) | 2012-07-04 | 2012-07-04 | Piston rod and cylinder body matched structure for hydraulic jack |
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| Publication Number | Publication Date |
|---|---|
| CN102765674A true CN102765674A (en) | 2012-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102280046A Pending CN102765674A (en) | 2012-07-04 | 2012-07-04 | Piston rod and cylinder body matched structure for hydraulic jack |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673931A (en) * | 2016-04-06 | 2016-06-15 | 龙工（上海）精工液压有限公司 | Piston for avoiding clamping stagnation |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1237621A1 (en) * | 1984-08-18 | 1986-06-15 | Государственный проектно-конструкторский и экспериментальный институт угольного машиностроения "Гипроуглемаш" | Hydraulic cylinder of jack |
| CN1147604A (en) * | 1995-10-11 | 1997-04-16 | 余毅钦 | Hydrauic automatically-controlled elastic-interference dynamically-sealed oil cylinder |
| CN2308590Y (en) * | 1997-09-12 | 1999-02-24 | 张孝公 | Hydraulic jack |
| CN2365184Y (en) * | 1999-02-23 | 2000-02-23 | 洪茂雄 | Hydraulic jack piston set capable of preventing oil hydraulic cylinder from scraping |
| CN201801346U (en) * | 2010-08-13 | 2011-04-20 | 北京纽希液压技术研究所 | Novel hydraulic jack |
| CN201992058U (en) * | 2011-04-22 | 2011-09-28 | 陈群鹤 | External jack rod piston supporting and sealing structure |
| CN202687866U (en) * | 2012-07-04 | 2013-01-23 | 常熟通润汽车零部件股份有限公司 | Piston rod and cylinder body matching structure of hydraulic jack |
-
2012
- 2012-07-04 CN CN2012102280046A patent/CN102765674A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1237621A1 (en) * | 1984-08-18 | 1986-06-15 | Государственный проектно-конструкторский и экспериментальный институт угольного машиностроения "Гипроуглемаш" | Hydraulic cylinder of jack |
| CN1147604A (en) * | 1995-10-11 | 1997-04-16 | 余毅钦 | Hydrauic automatically-controlled elastic-interference dynamically-sealed oil cylinder |
| CN2308590Y (en) * | 1997-09-12 | 1999-02-24 | 张孝公 | Hydraulic jack |
| CN2365184Y (en) * | 1999-02-23 | 2000-02-23 | 洪茂雄 | Hydraulic jack piston set capable of preventing oil hydraulic cylinder from scraping |
| CN201801346U (en) * | 2010-08-13 | 2011-04-20 | 北京纽希液压技术研究所 | Novel hydraulic jack |
| CN201992058U (en) * | 2011-04-22 | 2011-09-28 | 陈群鹤 | External jack rod piston supporting and sealing structure |
| CN202687866U (en) * | 2012-07-04 | 2013-01-23 | 常熟通润汽车零部件股份有限公司 | Piston rod and cylinder body matching structure of hydraulic jack |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673931A (en) * | 2016-04-06 | 2016-06-15 | 龙工（上海）精工液压有限公司 | Piston for avoiding clamping stagnation |
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| PB01 | Publication | ||
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Application publication date: 20121107 |