CN209510771U - Floating type low friction sealing ring cylinder - Google Patents

Abstract

The utility model provides a kind of floating type low friction sealing ring cylinder, it include: front cover, rear cover, cylinder barrel, piston rod and piston, front cover, cylinder barrel and rear cover are sequentially connected, piston rod is arranged in front cover, is partially set in cylinder barrel, and piston is set in cylinder barrel and connect with piston rod, it further include a sealing ring and a piston seal ring recess, wherein, piston seal ring recess is the annular trough body on piston, and the section of piston seal ring recess is in Y-shaped；The section of sealing ring is in Y-shaped, and the radially-outer surface of sealing ring is the arc sealing outwardly protruded, and a word portion of the Y-shaped of sealing ring includes several the raised sealings axially and symmetrically protruded；Sealing ring is arranged connection piston seal ring recess, the slot bottom of the inner ring non-contact piston seal groove of sealing ring.The utility model sealing ring is only generated the pressure of cylinder barrel by sealing ring material contoured support power itself, without the pressure that sealing ring seals piston seal slot bottom, so the small activity of pressure is fast.

Description

Floating type low friction sealing ring cylinder

Technical field

The utility model relates to cylinder technical fields more particularly to a kind of cylinder piston to use floating type low friction sealing ring Cylinder.

Background technique

Low rubbing cylinder refers to the cylinder of piston resistance to sliding very little, is usually used in the occasion of load support, in load force value When variation, it is used to support the load force with changes in balance.Therefore it is required that cylinder piston has extremely low frictional resistance and fast when moving The response speed of speed.As shown in Figure 1, the generation of cylinder piston resistance to sliding is generally by guide sleeve 1, support ring 2 and cylinder sealing ring 3 Frictional force composition.

With self-lubricating engineering plastics development and commercial grease different industries application and development.Cylinder piston The frictional resistance of guide sleeve 1 when sliding, support ring 2 can be ignored.The frictional force that cylinder seal circle 3 generates accounts for piston resistance to sliding 80% or more than column, 3 frictional force of cylinder seal circle is main to be made of following 3 part, and 1. sealing rings are the same as the friction between cylinder barrel Coefficient (machining accuracy of inner hole of cylinder, finish, the finish on sealing ring surface, between move lubricant grease)；2. sealing ring The design magnitude of interference of itself, (i.e. pressure of the sealing ring to cylinder barrel) 3. sealing rings are the same as the contact area between cylinder barrel.

The low friction sealing ring of suitable piston common at present is general to use as shown in Fig. 2, reducing the same cylinder barrel of sealing ring 3 Between contact area, or as shown in figure 3, using S type sealing ring 3 design structure reduce sealing ring pressure come reduce friction resistance Power.But since sealing ring has not been changed always with the design structure that piston seal slot bottom seals, sealing ring can not be solved and designed The pressure that the pressure amount that is full of will increase sealing ring to cylinder barrel when too big.Then there are problems that 2 always:

1. sealing ring designs, interference pressure amount is smaller, and relative wear sport life span is shorter；

2., also due to sealing ring design interference pressure amount is small, can not effectively be mended when sealing ring is by lateral force uneven wear It repays, sealing ring is be easy to cause to fail.

Therefore, there are some technical problems anxious to be resolved for the cylinder of the prior art.

Utility model content

The purpose of this utility model is to provide the cylinders that a kind of cylinder piston uses floating type low friction sealing ring, with solution Certainly the technical issues of the prior art.

In order to achieve the above objectives, the utility model provides a kind of floating type low friction sealing ring cylinder, comprising: front cover, after Lid, cylinder barrel, piston rod and piston, the front cover, cylinder barrel and rear cover are sequentially connected, and the piston rod is arranged in the front cover, portion Set up separately and be placed in the cylinder barrel, it further includes a sealing ring that the piston, which is set in the cylinder barrel and connect with the piston rod, With a piston seal ring recess, wherein the piston seal ring recess is the annular trough body on piston, the piston seal ring recess Section be in Y-shaped；The section of the sealing ring is in Y-shaped, and the radially-outer surface of the sealing ring is the arc outwardly protruded Sealing, a word portion of the Y-shaped of the sealing ring include several the raised sealings axially and symmetrically protruded；The sealing ring It is arranged the connection piston seal ring recess, the inner ring of the sealing ring does not contact the slot bottom of the piston seal ring recess.

According to floating type low friction sealing ring cylinder described in the utility model embodiment, the sealing ring further includes several A blow vent, the blow vent are located at the outer most edge of the sealing ring two sides.

The utility model improves existing cylinder, changes sealing ring with the seal form between piston seal ring recess, Generate sealing ring only by sealing ring material contoured support power itself to the pressure of cylinder barrel, when much smaller than sealing member material compression Internal stress, since pressure of the sealing ring to cylinder barrel is smaller, design interference pressure amount can be more, and more wear-compensatings are longer Service life；The resigning of piston seal ring recess, sealing ring are less with the contact area of cylinder barrel；There is no sealing ring to be compressed by cylinder barrel to become The trend that contact area when shape with cylinder barrel becomes larger；To the processing of piston seal ring recess without concentricity requirement, because floating, in cylinder barrel Under inner hole effect, automatic concentric trend improves the fast reaction and stability of cylinder.

Due to the technical characteristic more than using so that the utility model have the following advantages compared with the prior art and Good effect:

The first, the application sealing ring is only generated the pressure of cylinder barrel by sealing ring material contoured support power itself, not close The pressure that seal seals piston seal slot bottom, so pressure is small；

The second, the application sealing ring is smaller to the pressure of cylinder barrel, and design interference pressure amount can be more, more wear-compensatings Property, the service life is longer；

Third, the processing of the application piston seal ring recess are without concentricity requirement, because floating, under inner hole of cylinder effect, from Concentric trend is moved, the fast reaction and stability of cylinder are improved.

Certainly, any one specific embodiment for implementing the content of the present invention, might not have all of the above simultaneously Technical effect.

Detailed description of the invention

Fig. 1 is the cut-away diagram of prior art cylinder；

Fig. 2 is a kind of schematic diagram of prior art sealing ring；

Fig. 3 is another schematic diagram of prior art sealing ring；

Fig. 4 is the schematic diagram of the application sealing ring and piston seal ring recess；

Fig. 5 is the stereoscopic schematic diagram of the application sealing ring；

Fig. 6 is the cut-away diagram of the application sealing ring；

Fig. 7 is the main view of the application sealing ring；

Schematic diagram when Fig. 8 is the movement of the application sealing ring and piston seal ring recess.

Specific embodiment

Below in conjunction with attached drawing, the utility model is illustrated.

The floating type low friction sealing ring cylinder of the application, comprising: front cover, rear cover, cylinder barrel, piston rod and piston, it is described Front cover, cylinder barrel and rear cover are sequentially connected, and the piston rod is arranged in the front cover, are partially set in the cylinder barrel, the work Plug is set in the cylinder barrel and connect with the piston rod, as shown in figure 4, further including a sealing ring 10 and a piston seal Slot 20.Wherein, the piston seal ring recess 20 is the annular trough body on piston, and the section of the piston seal ring recess 20 is in Y-shaped.

In addition, please also refer to Fig. 5, Fig. 6 and Fig. 7, the section of the sealing ring 10 is in Y-shaped, the sealing ring 10 Radially-outer surface is the arc sealing 11 outwardly protruded, and a word portion of the Y-shaped of the sealing ring 10 includes axially and symmetrically convex Several raised sealings 12 out, the function of raised sealing 12 are to reach sealing function with the fitting of piston seal ring recess 20, As shown in fig. 6, the quantity of the raised sealing 12 symmetrically protruded is each two around, but cannot be used to limit the application, it is more It is some or few, it is all the protection scope of the application as long as the requirement of sealing can be reached；The sealing ring 10 is arranged connection institute Piston seal ring recess 20 is stated, as shown in figure 4, the inner ring of the sealing ring 10 does not contact the slot bottom of the piston seal ring recess 20, Slot bottom design has enough spaces, and resigning when magnitude of interference is formed for sealing ring 10 and cylinder barrel, and such design would not produce Compressing of the raw sealing ring 10 to piston seal slot bottom, reduces pressure.

In addition, as shown in figure 5 and figure 7, the sealing ring 10 further includes several blow vents 13, the blow vent 13 is located at The outer most edge of 10 two sides of sealing ring, the purpose of blow vent 13 are to allow gas to pass in and out in time；As shown, the number of blow vent 13 Amount is unilateral 8 symmetrically set up, but cannot be used to limit the application, mostly several or few several, as long as can reach logical in time The purpose of gas all should be the protection scope of the application.

Then illustrate the working principle of the application, as shown in figure 8, after assembly, the arc of the inner wall compressing sealing ring 10 of cylinder barrel Shape sealing 11, arc sealing 11, which is deformed inward, reaches sealing effect, that is, the magnitude of interference between sealing ring 10 and cylinder barrel Q is squeezed entirety by the inner wall of cylinder barrel and reduced inwardly, and sealing ring 10 and piston seal slot bottom do not contact.It emphasizes herein Once, sealing ring 10 is only generated the pressure F of cylinder barrel by sealing ring 10 material contoured support power itself, so pressure is small；Such as Fig. 8 Shown, under the ventilatory conditions of right side, piston is moved to the left, and is influenced by cylinder barrel and 10 right side venthole of sealing ring, sealing ring 10 lean on to the left, at this point, gas oppresses sealing ring 10, two raised sealings 12 and piston seal ring recess 20 of the position in left side to the left Cell wall fitting generate sealing, as in figure A point and B point, gas will not flee.Conversely, being then position as the piston moves to the right Sealing is generated in the cell wall fitting of two raised sealings 12 and piston seal ring recess 20 on right side.

As shown in figure 8, when mobile, sealing ring itself be stuck between the face C and the face D and inner hole of cylinder face formed float it is close Envelope, it is therefore, low on the machining requirements of piston to piston seal ring recess 20 or the face slot bottom E, without too high concentricity requirement. The power of cylinder barrel is only influenced by sealing ring 10 material contoured support power itself since the magnitude of interference Q of sealing ring 10 is generated, when design, Magnitude of interference Q can be bigger than the low friction sealing ring of the prior art, after long-time movement abrasion, there is more compensation rates.

The mentality of designing of the application is sealing ring with piston side seals, and slot bottom is there are bit space is allowed, in such design Under:

1, sealing ring is only influenced (and cylinder barrel installation cooperation by sealing ring contoured support power itself to the over pressure of cylinder barrel When, resigning can be inwardly formed), if over pressure is F, what F value generated when compressing much smaller than prior art sealing ring material interior is answered Power；

2, because F value is smaller, when design, can there is more Q value magnitude of interference, when sealing ring prolonged exercise is worn, Sealing ring itself forms the lower compensation of holding power effect and guarantees sealing, therefore has longer service life；

3, because sealing ring itself is to be stuck between the face C and the face D and inner hole of cylinder face to form floating seal, piston slot bottom itself The processing in the face E is if any Concentricity tolerance (such as deviation 0.1-0.2mm) or other processing, the piston and cylinder barrel that cooperation reason is formed Between Concentricity tolerance, will lead to the size that unilateral magnitude of interference occurs in prior art sealing ring (slot bottom sealing), meeting when movement There is the unilateral size abrasion (outer dimension decentraction after slot bottom size decentraction causes sealing ring to be installed) of sealing ring, but the application Sealing ring it is unaffected because be float.

Due to the technical characteristic more than using so that the utility model have the following advantages compared with the prior art and Good effect:

The first, the application sealing ring is only generated the pressure of cylinder barrel by sealing ring material contoured support power itself, not close The pressure that seal seals piston seal slot bottom, so pressure is small；

The second, the application sealing ring is smaller to the pressure of cylinder barrel, and design interference pressure amount can be more, more wear-compensatings Property, the service life is longer；

Third, the processing of the application piston seal ring recess are without concentricity requirement, because floating, under inner hole of cylinder effect, from Concentric trend is moved, the fast reaction and stability of cylinder are improved.

Disclosed above is only several specific embodiments of the utility model, but the utility model is not limited to this, is appointed What what those skilled in the art can think variation, should all fall within the protection scope of the present utility model.

Claims (2)

1. a kind of floating type low friction sealing ring cylinder, comprising: front cover, rear cover, cylinder barrel, piston rod and piston, the front cover, cylinder Cylinder and rear cover are sequentially connected, and the piston rod is arranged in the front cover, is partially set in the cylinder barrel, and the piston is set to It is connect in the cylinder barrel and with the piston rod, which is characterized in that further include a sealing ring and a piston seal ring recess, wherein

The piston seal ring recess is the annular trough body on piston, and the section of the piston seal ring recess is in Y-shaped；

The section of the sealing ring is in Y-shaped, and the radially-outer surface of the sealing ring is the arc sealing outwardly protruded, described One word portion of the Y-shaped of sealing ring includes several the raised sealings axially and symmetrically protruded；

The sealing ring is arranged the connection piston seal ring recess, and the inner ring of the sealing ring does not contact the piston seal ring recess Slot bottom.

2. floating type low friction sealing ring cylinder as described in claim 1, which is characterized in that the sealing ring further includes several A blow vent, the blow vent are located at the outer most edge of the sealing ring two sides.