CN201636125U - Oil-free lubricating structure of power cylinder - Google Patents

Oil-free lubricating structure of power cylinder Download PDF

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Publication number
CN201636125U
CN201636125U CN2010201553907U CN201020155390U CN201636125U CN 201636125 U CN201636125 U CN 201636125U CN 2010201553907 U CN2010201553907 U CN 2010201553907U CN 201020155390 U CN201020155390 U CN 201020155390U CN 201636125 U CN201636125 U CN 201636125U
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CN
China
Prior art keywords
piston
cylinder
oil
cover
piston rod
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CN2010201553907U
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Chinese (zh)
Inventor
田东海
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大连万讯电力仪表有限公司
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Priority to CN2010201553907U priority Critical patent/CN201636125U/en
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Publication of CN201636125U publication Critical patent/CN201636125U/en

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Abstract

The utility model discloses an oil-free lubricating structure of a power cylinder, which comprises a front end cover, a main piston rod sealing ring, a piston rod supporting ring, an auxiliary piston rod sealing ring, a cylinder barrel, a cylinder rodless cavity, a piston, an auxiliary piston sealing ring, a piston supporting ring, a main piston sealing ring, a cylinder rod cavity and a piston rod. At the position of the piston, the piston, the cylinder barrel, the main piston sealing ring and the auxiliary piston sealing ring form a sealing area on the piston; in the front end cover, the piston rod, the front end cover, the main piston rod sealing ring and the auxiliary piston rod sealing ring form a sealing area in the front end cover; and a piston grease storage cavity and an end cover grease storage cavity are arranged on the radial peripheries of the centers of holes of the piston and the front end cover. In the oil-free lubricating structure of the power cylinder, when a sealing part lacks lubricating grease, discontinuous forced compensation of stored lubricating grease to laced portions is realized, and lubricating effect of an oil-free lubricating cylinder is multiply increased.

Description

The oil-free lubrication structure of actuating cylinder

Technical field

The utility model relates to a kind of oil-free lubrication structure of actuating cylinder.

Background technique

Up to the present in the pneumatics, the piston of actuating cylinder and cylinder barrel; The lubricated of double-action actuating cylinder piston rod and the cylinder head place of being sealed and matched has dual mode because of the limitation of conditions substantially: a kind of is to send into the pressurized gas oil atomization of cylinder, to reach in the gas flow process, to the oil lubrication effect of the place's normality that is sealed and matched.Another kind is to adopt the dry oil free pressurized gas, only smears one deck lubricating grease on surface that cylinder and piston and piston rod need seal and Sealing during assembling, by lubricating grease the place of being sealed and matched is carried out grease lubrication.In the present grease lubrication mode, mainly have following problem: (1) lubricating grease particularly can consume minimizing because of having vapo(u)rability in the higher gas of temperature in gas.(2) Sealing in the cylinder and support ring (or claim: guide ring) can scrape lubricating grease gradually from the lubricated zone of need in the reciprocating action of work and slattern.Because these two problems exist and can not obtain replenishing of lubricating grease, so existing cylinder seal sliding distance to be issued in the condition of grease lubrication oil lubrication 5000~10000Km or more than, its Sealing unavoidably will experience the petty wiping three phases of the petty wiping in the petty wiping-border of liquid of lubricating grease-do.And follow this phenomenon, and cylinder unavoidably can be because of lacking the lubricated internal resistance increase that occurs, and exerting oneself reduces, and the situation that leakage rate increases seriously restricts the raising of cylinder durability.

The model utility content

The purpose of this utility model provides a kind of oil-free lubrication structure that improves the actuating cylinder of cylinder durability.

The technological scheme that the utility model is adopted for achieving the above object is: a kind of oil-free lubrication structure of actuating cylinder, comprise front cover, piston rod primary seal circle, the piston rod support ring, the piston rod auxiliary seal ring, cylinder barrel, the cylinder rodless cavity, piston, the piston auxiliary seal ring, the piston support ring, piston primary seal circle, cylinder rod chamber and piston rod, at the piston place, piston, cylinder barrel, piston primary seal circle and piston auxiliary seal ring form the sealing area on the piston, in front cover, piston rod, front cover, piston rod primary seal circle and piston rod auxiliary seal ring form the sealing area in the front cover; Piston and center, front cover hole periphery radially are provided with piston grease storing cavity and end cap grease storing cavity.

Described piston support ring is between piston primary seal circle and piston auxiliary seal ring, and described piston rod support ring is between piston rod primary seal circle and piston rod auxiliary seal ring.

The rodless cavity of described cylinder and the sealing area on the piston are communicated with by intercommunicating pore d1 and piston grease storing cavity.

Sealing area in described cylinder rod chamber and the front cover is communicated with by join alicyclic ring groove and the end cap grease storing cavity on intercommunicating pore d2 on the front cover and the front cover.

Described piston primary seal circle is two-way pneumatic seal ring or one-way pneumatic seal ring.

When described piston primary seal circle adopted the one-way sealing circle, this piston primary seal circle was for being close to set-up mode back-to-back in pairs.

Described piston auxiliary seal ring is the two-way pneumatic seal ring.

Described piston rod primary seal circle is two way sealed circle or the pneumatic piston rod seal ring with one-way sealing effect.

Described piston grease storing cavity and end cap grease storing cavity are annular groove or circular hole form.

When the transposing of piston primary seal circle and position, the piston auxiliary seal ring left and right sides, the opening of piston grease storing cavity is towards cylinder rod chamber one side, and the cylinder rod chamber is communicated with by intercommunicating pore d1 and piston grease storing cavity with sealing area on the piston.

The oil-free lubrication structure of the utility model actuating cylinder compared with prior art has following beneficial effect:

1, according to the requirement of industries such as protection environment and electronics, medical treatment, food, do not allow oil in the environment, so oil-free lubrication is a development trend in the pneumatics, oil-free lubrication simultaneously can make system simplification.

2, in this structure when the Sealing place lacks lubricating grease, realized that the lubricating grease of storing forces to replenish to lacking position discontinuity.Avoided in the present oil-free lubrication, because of the lubricating grease property that flows poor, appearance apart from needing lubricated place be equipped with fat for the phenomenon of not passing by than amphi position.

3, by suitably adjusting piston and cylinder head storage fat position physical dimension, rationally control the storage volume of lubricating grease, make it with the normal oil lubrication state of cylinder seal spare under expected life be complementary, just can eliminate the appearance of Sealing, the dried petty wiping in support ring place, improve the durability of oil-free lubrication cylinder, realize the non-maintaining use in the cylinder Life cycle.

4, this method technology is simple, realizes easily.

Description of drawings

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is the non-buffering actuating cylinder of the oil-free lubrication structure structural representation of the utility model actuating cylinder;

Fig. 2 is the non-buffering actuating cylinder of the oil-free lubrication structure piston structure plan view of the utility model actuating cylinder;

Fig. 3 is that the non-buffering actuating cylinder of Fig. 2 piston structure A-A is to sectional view;

Fig. 4 is an A place partial enlarged drawing among Fig. 1;

Fig. 5 is the oil-free lubrication structure buffering actuating cylinder front cover structural drawing of the utility model actuating cylinder;

Fig. 6 is the non-buffering actuating cylinder structural representation when the primary seal circle is the one-way sealing circle on the oil-free lubrication structure piston of the utility model actuating cylinder.

Embodiment

As Fig. 1, shown in Figure 6, the oil-free lubrication structure of actuating cylinder comprises front cover 1, piston rod primary seal circle 2, end cap grease storing cavity 3, piston rod support ring 4, piston rod auxiliary seal ring 5, cylinder barrel 6, cylinder rodless cavity 7, piston 8, piston auxiliary seal ring 9, piston support ring 10, piston grease storing cavity 11, piston primary seal circle 12, cylinder rod chamber 13, screw plug 14 and piston rod 15.Under the guaranteed performance prerequisite, on the piston 8 of cylinder and front cover 1, set up piston auxiliary seal ring 9 and piston rod auxiliary seal ring 5 with two way sealed function.Referring to shown in Figure 4, at the piston place, the closed area that piston 8, cylinder barrel 6, piston primary seal circle 12 and piston auxiliary seal ring 9 are formed on the piston, piston support ring 10 is between piston primary seal circle 12 and piston auxiliary seal ring 9; Equally, in the cylinder front cover, the sealing area that piston rod 15, front cover 1, piston rod primary seal circle 2 and piston rod auxiliary seal ring 5 form in the front cover, piston rod support ring 4 is between primary seal circle 2 and piston rod auxiliary seal ring 5.On cylinder piston 8 and center, front cover 1 hole periphery radially, make piston grease storing cavity 11 and end cap grease storing cavity 3, be communicated with by intercommunicating pore d1 and piston grease storing cavity 11 rodless cavity 7 and the sealing area on the piston with cylinder; Equally, by join alicyclic ring groove D3 * F3 and grease storing cavity 3 on the intercommunicating pore d2 on the front cover and its cylinder rod chamber 13 is communicated with sealing area on the front cover 1.In the work, when the lubricating grease M at piston 8 or piston rod 15 Sealing places consumes minimizing, lack the reduction that the place can form lubricating grease M pressure, pressurized gas P1 or P2 when utilizing work in the cylinder, promote the lubricating grease M that stores in the grease storing cavity and replenish, realize pressure lubrication piston 8, cylinder front cover 1 sealed department position discontinuity lubricating grease M to the Sealing place wriggling that piston or front cover need lubricate.In Fig. 1 and double-acting cylinder structure shown in Figure 4, piston primary seal circle 12 is satisfying under the pneumatic seal fitness for purpose prerequisite, requires to have two-way or the one-way pneumatic seal action; As shown in Figure 6, when piston primary seal circle 12 adopts the one-way sealing circle, must be close in pairs back-to-back and use.Piston auxiliary seal ring 9 is satisfying under the pneumatic seal fitness for purpose prerequisite, requirement has the two-way pneumatic seal action, but after reducing to set up auxiliary seal on the piston, the cylinder internal resistance that brings increases, require its seal ring to have low friction factor and quiet, the coefficient of kinetic friction is close as far as possible, as adopt two triangle sliding ring type combined pneumatic seal rings of Che Shi in the co-axial seal circle class, and Che Shi C type sliding ring type combined seal ring etc., the material behavior of PTFE better satisfies the cylinder seal requirement to utilize wherein.Piston rod primary seal circle 2 can be the two way sealed circle, also can be various pneumatic piston rod seal rings with one-way sealing effect.Piston rod auxiliary seal ring 5 is the same with piston auxiliary seal ring 9, require to have the two-way pneumatic seal action, and friction factor is low, and is quiet, the coefficient of kinetic friction is close.In Fig. 1 and Fig. 6, when piston primary seal circle 12 is changed with position, piston auxiliary seal ring 9 left and right sides, the opening of piston grease storing cavity 11 is towards cylinder rod chamber 13 1 sides, and by hole d1 and piston grease storing cavity 11 cylinder rod chamber 13 is communicated with sealing area on the piston.Wherein, piston grease storing cavity 11 in piston 8 and the front cover 1 and end cap grease storing cavity 3 are not limited to accompanying drawing 1, Fig. 2, Fig. 5, circular hole shown in Figure 6, can take other form as required, as the piston grease storing cavity 11 on the piston 8 can for one with the coaxial annular groove of outside piston etc., but should be to guarantee that piston 8 and front cover 1 rigidity be prerequisite.

As shown in Figures 2 and 3, piston primary seal circle mounting groove groove width H1 and groove bottom footpath D1 is by modular, pneumatically powered piston packing trench design.The piston auxiliary seal ring is installed with ditch groove width H2 and footpath, end D2, consider and reduce to set up on the piston quiet, the moving petty wiping resistance that increases behind the auxiliary seal, and make quiet, the approaching unanimity of kinetic friction resistance, by the groove parameter designing of pneumatic piston with the requirement of coaxial class two way sealed combination seal.As: the groove parameter that the two triangle sliding ring type combined pneumatic seal rings of Che Shi require, and get the lower limit of D2 size.Referring to Fig. 1 and Fig. 4, when cylinder rodless cavity 7 air pressure raise, because the total length of each grease storing cavity 11 and its intercommunicating pore d1 is less than 60 millimeters, the loss of lubricating grease M resistance to motion is minimum, piston auxiliary seal ring 9 both sides all have the equal or approaching pressure that equates of P1 to keep in each moment, so require lower slightly to the sealing effect of piston auxiliary seal ring 9.In Fig. 2, Fig. 3 piston 8 part sketches, for the axial dimension that reduces piston and make storage fat amount maximum, hole d1 opens on limit, support ring mounting groove left side.According to circumstances, also can on piston, open and join the alicyclic ring groove, make grease storing cavity and join the alicyclic ring groove and communicate by hole d1.Other physical dimension is carried out by existing design standard as required and both can on the piston.

As shown in Figure 5, for the intercommunicating pore d2 of end cap grease storing cavity 3, consider technology capability, the orifice part of front cover 1 appearance face d2 is with screw plug 14 sealings.At the root of hole d2, have with d2 and be common to the annular groove D3 * F3 that joins fat mutually.The trench design of piston rod auxiliary seal ring 5 is similar to the trench design of piston auxiliary seal ring 9, and by the groove parameter designing of pneumatic piston rod with the requirement of coaxial class combination seal, groove root footpath is near the upper limit that requires size.The cylinder front cover is except that storage fat, for fat, the auxiliary seal part, and other physical dimension is carried out by existing design standard as required and both can.

Cylinder piston 8 and front cover 1 for processing technology and the technical requirements that realizes the oil-free lubrication performance are:

1. cylinder piston and front cover relate to line, vertical milling, boring, tapping for realizing oil-free lubrication performance technology content, and general pneumatic machinery process unit all can realize.

2. the lubricating grease M performance of storing in the cylinder is satisfying under the different operating mode purposes requirement prerequisites, and the dropping point temperature T should be greater than the work maximum temperature more than 50 ℃.In order to avoid lubricating grease M pours off certainly from storage fat hole under the higher situation of temperature.Preferably use the cylinder special grease.

3. the lubricating grease M that stores in piston and the front cover should exclude air.Because air bag can occupy the grease storing cavity confined space; The compressibility of air can delay building the pressure time of the lubricating grease M of Sealing place; Air bag can intercept the normal of lubricating grease and carry continuously in the duct, it is lubricated to cause the Sealing part to lack.

Referring to shown in Figure 1, the work cycle process of cylinder is: piston 8 and piston rod 15 process that moves to left: pressurized air enters from cylinder B mouth, cylinder rodless cavity 7 pressure P 1 raise, lubricating grease M is promoted by right atrial pressure in the piston grease storing cavity 11, wriggle between piston primary seal circle 12 and piston auxiliary seal ring 9 by hole d1, sealing area lubricating grease M pressure raises between piston 8 upper piston primary seal circles 12 and the piston auxiliary seal ring 9, and reach balance with P1, simultaneously, implementation is to the pressure grease lubrication of piston seal and support ring.Piston 8 left sides: air is drained from cylinder C mouth, and pressure P 2 reduces, and piston 8 and piston rod 15 move to left.Sealing on the piston rod 15 is in the grease lubrication state under the pressure P 2 with the reduction of cylinder rod chamber 13 pressure P 2.Piston 8 and piston rod 15 process that moves to right: pressurized air enters from cylinder C mouth, cylinder rod chamber 13 pressure P 2 raise, lubricating grease M is subjected to the effect of right atrial pressure P2 in the cylinder front cover 1 upper end cap grease storing cavity 3, by annular groove D3 closed area wriggling between piston rod primary seal circle 2 and piston rod auxiliary seal ring 5 of being opened in hole d2 and the front cover, closed area pressure raises between piston rod primary seal circle 2 and the piston rod auxiliary seal ring 5, and reach balance with pressure P 2, simultaneously, rod seal part and its support ring are carried out pressure grease lubrication.Piston 8 right sides: gas is drained from cylinder B mouth, and pressure P 1 reduces, and separate lubrication fat M pressure reduces between piston 8 upper piston primary seal circles 12 and the piston auxiliary seal ring 9, and piston 8 and piston rod 15 move to right.Sealing is in the grease lubrication state under the pressure P 1 with the reduction of pressure P 1 on the piston.

Claims (10)

1. the oil-free lubrication structure of an actuating cylinder, comprise front cover, piston rod primary seal circle, piston rod support ring, piston rod auxiliary seal ring, cylinder barrel, cylinder rodless cavity, piston, piston auxiliary seal ring, piston support ring, piston primary seal circle, cylinder rod chamber and piston rod, it is characterized in that: at the piston place, piston, cylinder barrel, piston primary seal circle and piston auxiliary seal ring form the sealing area on the piston, in front cover, piston rod, front cover, piston rod primary seal circle and piston rod auxiliary seal ring form the sealing area in the front cover; Piston and center, front cover hole periphery radially are provided with piston grease storing cavity and end cap grease storing cavity.
2. according to the oil-free lubrication structure of the described actuating cylinder of claim 1, it is characterized in that: described piston support ring is between piston primary seal circle and piston auxiliary seal ring, and described piston rod support ring is between piston rod primary seal circle and piston rod auxiliary seal ring.
3. according to the oil-free lubrication structure of the described actuating cylinder of claim 1, it is characterized in that: the rodless cavity of described cylinder and the sealing area on the piston are communicated with by intercommunicating pore d1 and piston grease storing cavity.
4. according to the oil-free lubrication structure of the described actuating cylinder of claim 1, it is characterized in that: the sealing area in described cylinder rod chamber and the front cover is communicated with by join alicyclic ring groove and the end cap grease storing cavity on intercommunicating pore d2 on the front cover and the front cover.
5. according to the oil-free lubrication structure of claim 1 or 2 described actuating cylinders, it is characterized in that: described piston primary seal circle is two-way pneumatic seal ring or one-way pneumatic seal ring.
6. according to the oil-free lubrication structure of the described actuating cylinder of claim 5, it is characterized in that: when described piston primary seal circle adopted the one-way sealing circle, this piston primary seal circle was for being close to set-up mode back-to-back in pairs.
7. according to the oil-free lubrication structure of claim 1 or 2 described actuating cylinders, it is characterized in that: described piston auxiliary seal ring and piston rod auxiliary seal ring are the two-way pneumatic seal ring.
8. according to the oil-free lubrication structure of the described actuating cylinder of claim 1, it is characterized in that: described piston rod primary seal circle is two-way pneumatic seal ring or the pneumatic piston rod seal ring with one-way sealing effect.
9. according to the oil-free lubrication structure of claim 1 or 3 or 4 described actuating cylinders, it is characterized in that: described piston grease storing cavity and end cap grease storing cavity are annular groove or circular hole form.
10. according to the oil-free lubrication structure of the described actuating cylinder of claim 1, it is characterized in that: when piston primary seal circle and the transposing of position, the piston auxiliary seal ring left and right sides, the opening of piston grease storing cavity is towards cylinder rod chamber one side, and the cylinder rod chamber is communicated with by intercommunicating pore d1 and piston grease storing cavity with sealing area on the piston.
CN2010201553907U 2010-04-07 2010-04-07 Oil-free lubricating structure of power cylinder CN201636125U (en)

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Application Number Priority Date Filing Date Title
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102207115A (en) * 2011-03-24 2011-10-05 大连万讯电力仪表有限公司 Travel-adjustable forced grease lubrication straight-travel cylinder
CN102944510A (en) * 2012-11-14 2013-02-27 安徽大地熊新材料股份有限公司 Device and method for testing oil corrosion of sintered NdFeB permanent magnet
CN103016441A (en) * 2012-12-31 2013-04-03 浙江工业大学 Air flotation cylinder for forming stable air film by microporous material
CN103016443A (en) * 2012-12-31 2013-04-03 浙江工业大学 Air suspension friction-free air cylinder provided with pressure relief groove
CN104074979A (en) * 2014-05-20 2014-10-01 苏州好特斯模具有限公司 Noise reduction cylinder
CN104154072A (en) * 2014-07-30 2014-11-19 莱歇研磨机械制造(上海)有限公司 Improved structure of hydraulic cylinder of hydraulic loading system for mill

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102207115A (en) * 2011-03-24 2011-10-05 大连万讯电力仪表有限公司 Travel-adjustable forced grease lubrication straight-travel cylinder
CN102207115B (en) * 2011-03-24 2013-06-19 大连万讯电力仪表有限公司 Travel-adjustable forced grease lubrication straight-travel cylinder
CN102944510A (en) * 2012-11-14 2013-02-27 安徽大地熊新材料股份有限公司 Device and method for testing oil corrosion of sintered NdFeB permanent magnet
CN103016441A (en) * 2012-12-31 2013-04-03 浙江工业大学 Air flotation cylinder for forming stable air film by microporous material
CN103016443A (en) * 2012-12-31 2013-04-03 浙江工业大学 Air suspension friction-free air cylinder provided with pressure relief groove
CN103016441B (en) * 2012-12-31 2015-02-18 浙江工业大学 Air flotation cylinder for forming stable air film by microporous material
CN103016443B (en) * 2012-12-31 2015-08-12 浙江工业大学 A kind of gas suspension with pressure relief groove is without friction cylinder
CN104074979A (en) * 2014-05-20 2014-10-01 苏州好特斯模具有限公司 Noise reduction cylinder
CN104154072A (en) * 2014-07-30 2014-11-19 莱歇研磨机械制造(上海)有限公司 Improved structure of hydraulic cylinder of hydraulic loading system for mill

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Granted publication date: 20101117

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