CN201202707Y - Floating guide hydraulic cylinder - Google Patents

Abstract

Disclosed is a floating guide hydraulic cylinder, comprising a piston rod, a front gland bush, a hydraulic control valve, an external oil circuit, a cylinder tube, a gasket ring and a guide ring. The floating guide hydraulic cylinder is characterized in that a cylinder sleeve of the hydraulic cylinder is composed of a left cylinder sleeve which is sleeved at the outer surface of the piston rod, a floating sleeve and a right cylinder sleeve. The floating sleeve is sleeved between the left cylinder sleeve and the right cylinder sleeve and is connected with the left cylinder sleeve and the right cylinder sleeve through floating sleeve gasket rings at two ends of the floating sleeve. Clearance seal is developed between the floating sleeve and the piston rod, forming pressure drop. A seal piece between the left cylinder sleeve and the piston rod is at low pressure and can achieve good seal and can work effectively for a long time. Pressure drop can be well controlled by properly adjusting the clearances of the floating sleeve, and due to the existence of the floating sleeve, processing precision requirements to the matching pieces are reduced. The floating guide hydraulic cylinder is reduced in making cost and is convenient to popularize.

Description

Floating guiding hydraulic cylinder

Technical field

This technology is widely used in hydraulic driving and uses oil hydraulic cylinder, servocylinder and similar executive component field of employment thereof.Because its requirement on machining accuracy is general, the life-span is long, be particluarly suitable for environment abominable, change in the inconvenient metallurgy industry and use.

Background technique

Both at home and abroad the guiding majority that generally adopts such as oil hydraulic cylinder, servocylinder is a seal ring, just constantly improves sealed material and processing, processing method improves the life-span, can satisfy usage requirement substantially.Along with the raising of oil cylinder working pressure, seal ring also improves the clamping force of piston rod thereupon, and under high speed to-and-fro motion situation, wearing and tearing, heating can appear in the seal ring guiding, until the phenomenon of damaging.

Summary of the invention

The purpose of this utility model provides a kind of floating guiding hydraulic cylinder, clearance seal between utilization floating bushing and the piston rod, not only form oil and touch the support piston bar at floating bushing and piston rod, and the process clearance seal transits to low pressure with the piston side oil pressure gradually by high pressure, guarantee that seal ring is operated in environment under low pressure, and the life-span is longer; Owing to the adaptivity of floating bushing, requirement on machining accuracy is reduced simultaneously.

The technical solution of the utility model: a kind of floating guiding hydraulic cylinder, comprise piston rod, preceding gland, hydraulic control valve, external oil circuit, cylinder barrel, seal ring and guide ring, it is characterized in that: the cylinder sleeve of oil hydraulic cylinder is made up of the left cylinder sleeve that is enclosed within the piston rod outer surface, floating bushing and right cylinder sleeve, floating bushing is between left cylinder sleeve and right cylinder sleeve, and floating bushing is linked to each other with left and right cylinder sleeve by the floating bushing seal ring at two ends.By the utilization floating bushing, original whole cylinder sleeve is decomposed into three, piston rod by original same oil pressure of each section, is divided into the segmentation oil pressure that reduces step by step.Improve the working environment of seal ring.

Aforesaid floating guiding hydraulic cylinder is characterized in that: place dust ring before the seal ring of left cylinder sleeve, also increase protective housing at the floating guiding hydraulic cylinder front end.Protect dust ring with protective housing, be the operating life that improves cylinder.

The advantage that the utility model compared with prior art has, characteristics and good effect: utilize the appropriate gap between floating bushing and the piston rod, form even oil film, be the piston rod guiding, owing to producing pressure, appropriate gap falls simultaneously, guarantee that left cylinder sleeve is in the operating on low voltage environment, thereby alleviate the wearing and tearing between seal ring and the piston rod when guaranteeing the high speed to-and-fro motion, have than long service live and accuracy of manufacturing and reduce.At floating type hydraulic cylinder end head, set up protective housing simultaneously, keep seal ring not to be subjected to the invasion of rugged environment, be and improve its operating life.After adopting floating bushing, requirement on machining accuracy is reduced, saved cost.

Description of drawings

Fig. 1 is the utility model embodiment's a housing structure schematic representation.

Fig. 2 is the outline drawing of Fig. 1.

Fig. 3 is left cylinder sleeve 2 figure among Fig. 1.

Fig. 4 is floating bushing 3 figure of Fig. 1.

Fig. 5 is right cylinder sleeve 4 figure among Fig. 1.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail.

The explanation of mark among Fig. 1: piston rod 1, left cylinder sleeve 2, floating bushing 3, right cylinder sleeve 4, preceding gland 5, hydraulic control valve 6, external oil circuit 7, cylinder barrel 8, protective housing 9, dust ring 10, seal ring 11, guide ring 12, floating bushing seal ring 13.

Embodiment of the present utility model such as Fig. 1～shown in Figure 5.

Referring to Fig. 1, embodiment's floating guiding hydraulic cylinder of the present utility model, comprise piston rod 1, preceding gland 5, hydraulic control valve 6, external oil circuit 7, cylinder barrel 8, seal ring 11, guide ring 12, it is characterized in that: the cylinder sleeve of oil hydraulic cylinder is made up of the left cylinder sleeve 2 that is enclosed within piston rod 1 outer surface, floating bushing 3 and right cylinder sleeve 4, floating bushing 3 is between left cylinder sleeve 2 and right cylinder sleeve 4, and floating bushing 3 is linked to each other with left and right cylinder sleeve by the floating bushing seal ring 13 at two ends.

Because floating bushing 3 is linked to each other by sealed at both ends and left and right cylinder sleeve 2,4, allow it to move along girth, be enclosed within piston rod 1 outer surface simultaneously, when fluid by between floating bushing 3 and the piston rod 1 during the gap, automatically the gap is even between maintenance floating bushing 3 and the piston rod 1, and need not to rely on fully processing or installation precision guarantee, thereby can reduce requirement on machining accuracy; Simultaneously as long as gap appropriateness between floating bushing 3 and the piston rod 1, fluid by the time certainly lead to pressure and fall, thereby make the seal ring 11 on the left cylinder sleeve 2 be in the operating on low voltage state, and operating life is longer.

The utility model is decomposed into three by utilization floating bushing 3 with original whole cylinder sleeve, and piston rod 1 by original same oil pressure of each section, is divided into the segmentation oil pressure that reduces step by step, improves the working environment of seal ring 11.Constitute clearance seal formation pressure between floating bushing 3 and the piston rod 1 and fall, the seal ring 11 between left cylinder sleeve 2 and the piston rod 1 is in low-pressure state, can realize excellent sealing, again can long-acting work.Suitably adjust floating bushing 3 gaps, just better pilot pressure falls, because the existence of floating bushing 3, the requirement on machining accuracy of counterpart has been reduced, and cost reduces, the convenient popularization.

Present embodiment has added dust ring 10, and has also increased protective housing 9 protection dust rings 10 at the floating guiding hydraulic cylinder front end, is the operating life that improves cylinder.

The advantage that the utility model compared with prior art has, characteristics and good effect: the technical characterstic of this device is with flying height oil film guide piston bar 1, forming pressure simultaneously falls, make left cylinder sleeve 2 seal rings 11 be in the operating on low voltage environment, increase end face protective housing 9 and dust ring 10 simultaneously, reduce thereby have than long service live and accuracy of manufacturing when guaranteeing the high speed to-and-fro motion.

Claims (2)

1, a kind of floating guiding hydraulic cylinder, comprise piston rod, preceding gland, hydraulic control valve, external oil circuit, cylinder barrel, seal ring and guide ring, it is characterized in that: the cylinder sleeve of oil hydraulic cylinder is made up of the left cylinder sleeve that is enclosed within the piston rod outer surface, floating bushing and right cylinder sleeve, floating bushing is between left cylinder sleeve and right cylinder sleeve, and floating bushing is linked to each other with left and right cylinder sleeve by the floating bushing seal ring at two ends.

2, floating guiding hydraulic cylinder as claimed in claim 1 is characterized in that: place dust ring before the seal ring of left cylinder sleeve, also increase protective housing at the floating guiding hydraulic cylinder front end.

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