Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J1/00—Pistons; Trunk pistons; Plungers
  • F16J1/10—Connection to driving members
  • F16J1/12—Connection to driving members with piston-rods, e.g. rigid connections
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J10/00—Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general
  • F16J10/02—Cylinders designed to receive moving pistons or plungers

Definitions

• the present invention relates to a working
• cylinder • cylinder comprising a cylinder part with two end por- 5 tions J ,and an interconnecting cylinder pipe, a piston movable within the cylinder pipe and a piston rod at ⁇ tached to the piston and extending through one end portion.
• An object of the present invention is to pro ⁇ vide a new hydraulic cylinder which eliminates the above drawbacks.
• the hydraulic cylinder according to the inven ⁇ tion is mainly characterized in that
• the cylinder pipe is at both ends thereof de- -•• formed to provide a clamping surface; both' end portions -are provided with a shoulder outside the respective cylinder pipe end; and the cylinder pipe is connected with the respec- tive end portions by means of a compression clamp fer ⁇ rule in firm engagement both with the clamping surf ce : * of the cylinder pipe and .with the shoulder of the end portion.
• the cylinder pipe when the cylinder pipe wall is relatively thin, the cylinder pipe is at both ends thereof prov ⁇ ided with a conical flare; both- end portions are provided with a support surface bearing on the inside of the respective flare and a shoulder outside the flare end; and the cylinder pipe is connected with the respec ⁇ tive end portions by means of a compression clamp fer ⁇ rule in firm engagement with both the flare of the cylinder pipe and the shoulders of the end portions.
• the cyl ⁇ inder pipe is at both ends thereof provided with an annular groove, and the cylinder pipe is connected with the respective end portions by means of a com- pression clamp ferrule in firm engagement both with the annular groove of the cylinder pipe and with the - J shoulder .ofTMthe end portion.
• Another object of the invention is to provide a new method of assembling a working cylinder.
• One pre ⁇ ferred embodiment, for cylinders with relatively thin 10 walls comprises cutting a cylinder pipe to a desired length, flaring both ends of the cut cylinder pipe, joining both flared ends of the cut cylinder pipe to the respective hydraulic cylinder end portions 15 each provided with a support surface for abutment with the internal surface of the respective flare and with a shoulder outside the end of the respective flare, and compressing a metal ferrule into firm engage- 20 ment both with the external surface of the flare and with said shoulder of the respective hydraulic cyl ⁇ inder end portion.
• Another preferred embodiment, for cylinders with relatively thick walls comprises '25 cutting a cylinder pipe to a desired length, forming an annular groove a't both ends of the cut .
• cylinder pipe joining both ends of the cut cylinder pipe to the respective hydraulic cylinder end portions each
• the ⁇ major advantage of the invention is that the costs for manufacturing hydraulic cylinders are dramatically reduced, because there is no need for ex ⁇ pensive working machines, no need for large stores and long series, and no need for skilled labour.
• the re ⁇ quired stroke length of each hydraulic cylinder can without extra costs be individually determined at the very place, anywhere where the hydraulic cylinder shall work, and the cylinder can easily be assembled there by means of simple, portable tools.
• a further object of the invention is to provide a new piston construction which is easier to mount than previous constructions.
• the piston rod is provided with an annular groove on both sides of the piston for receiving a press ring.
• the press rings are massive, and
• the ring material "flows" slightly out- wards to the sides into close contact with the re- spective piston ends. Therefore the location of th annular groove of the piston rod need not precisel correspond to the length of the piston positione therebetween.
• the inner edges thereof ar preferably provided with two diametrically positione recesses, whereby the recesses should preferably be a least as deep as the respective annular grooves. Tha portion of the press ring which projects from the an nular groove is cut at the recesses, whereafter th press rings can be knocked off. ,
• Figure 1 is a partial longitudinal section of an embodiment for relatively thin cylinder pipes.
• Figure 2 is likewise a partial longitudinal section of an embodiment for thick cylinder pipes.
• Figures 3 and 4 are a front view and a partial sectional side view, respectively, of a clamp ferrule.
• Figures 5 to 8 show different stages of the mounting of the piston on the piston rod in a partial longitudinal section.
• Figures 9 and 10 are end views of Figures 6 and 7, respectively.
• the reference numeral 1 designates a forward end portion of the cylinder part of the working cyl ⁇ inder
• 2 designates a backward end portion
• 3 desig ⁇ n ates a cylinder pipe interconnecting the end portions 1 and 2
• 4 designates a cylinder piston movable within the pipe 3
• 5 designates a piston rod secured to the piston 4
• the novelty lies in the way the pipe 3 is con ⁇ nected to the end portions 1 and 2.
• the pipe 3 is pro ⁇ vided with flares 8 and 9 at both ends thereof; the end portions 1 and 2 are provided with support sur- faces 10 and 11 bearing internally on the flares 8 and 9; shoulders 12 and 13 are formed in the end por ⁇ tions outside the ends of the flares 8 and 9; and the pipe 3 is .arranged to be maintained in place by means of compression clamp ferrules 14 and 15 which comprise edge flanges 16 and 17 which get into engagement with the shoulders 12 and 13 and on the respective other side are in close engagement with the flares 8 and 9 of the pipe 3 by means of engagement parts 18 and 19 formed internally.
• the pipe 3 is simply cut into the required length, a ⁇ id* the ends to not require any surface finishing.
• the flares 8 and 9 are easy to be formed with standard tools; the clamp ferrules with the re ⁇ quired inner configuration are likewise inexpensive to manufacture. Similarly, a variety of tools for com ⁇ pressing the ferrules 14 and 15 in place are available -on the market and easy to use.
• the ferrules 14 and 15 are pro ⁇ vided with local openings 25 extending axially through the parts 16 and 18 and 17 and 19, respective ⁇ ly. These openings, at least two in number, are not visible in. Figure 1, whereas they appear from Figures 3 and 4.
• the seal of the piston 4 against the cylinder pipe 3 is designated with the reference numeral 24.
• the end flare 8 of the pipe also" has the advantage that the piston 4 can be in se ted in the pipe 3 without any risk of the seal 2
• pipe 3a has a wall of such thickness that a flarin operation is inconvenient, or even impossible.
• annular grooves are formed in the ex ternal surface of the cylinder pipe 3a close to it respective ends, and, consequently, the clamp ferrule
• a similar clamp ferrule 20 is employe for joining a connection member 21 to the piston rod, as in Figure 1.
• Figures 3 and 4 show a separate clamp ferrul 14 with the weakened points mentioned in connectio
• the weakened points are formed by re ⁇ Completes 25, for instance.
• the respective recess 25, which also can be a boring with narrow inner necks provided at the opening of the recess 25 for enabling .t e breaking, extends axially through the engaging
• the reference numeral 40 de ⁇ signates a"piston rod; 41 designates a piston.
• the piston rod 40 is provided with an annular groove on both sides of the piston 41, designated with 42 and 43, respectively, and two press rings are designated with 44 and 45 " , respectively.
• 46 designates a periph- ⁇ ⁇ eral annular recess on the piston 41, intended for re ⁇ closing a sealing means for sealing the piston with respect to a surrounding cylinder wall.
• 47 designates a support ring of metal, for instance; and 48 desig ⁇ nates a sealing ring such as a conventional 0-ring.
• the rings 47 and 48 are received by an annular recess 49 provided on the inside of the piston 41.
• 50 desig ⁇ nates two diametrically positioned recesses in the in- ner edge of the press ring 44; and the necks between -.'the outer periphery of tire ring 44 and the bottom of the respective recess 50 are designated with 51.
• the rings 44 and 45 are easy to press into the grooves 42 and 43 by means of tools available on the market at a low price. When the rings 44 and 45 are pressed into the grooves, their diameter is reduced, whereas the ring thickness is increased to the same degree, so that a close contact is achieved with both ends of the piston 41 even in cases where the distance between the grooves 42 and 43 does not exactly correspond to the length of the piston 41.
• the press rings can be quite massive; however, if the rings are to be dis ⁇ mounted later on, it is of advantage to provide the inner edge with two diametrically positioned recesses 50 preferably at least equally deep as the grooves 42 and 43.
• the recesses 50 are, as appears from Figure 10, clamp ⁇ ed together, possibly up to a mutual surface contact.
• the ring halves can thereafter be removed with suitable tools without any greater difficulty.
• the sealing rings 47 and 48 can also be ar ⁇ ranged adjacent to the press ring 45; other sealing solutions can be used alternatively.
• the recesses 50 in the inner edge of the press rings can be more than two in number, and the ratio between the dimensions of the piston -rod 40 and the piston 41 as well as the shape of the piston in general can vary considerably.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Pistons, Piston Rings, And Cylinders (AREA)
• Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
• Actuator (AREA)

Applications Claiming Priority (6)

Publications (1)

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Family Applications (1)

Country Status (6)

Cited By (1)

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Family Cites Families (9)

• 1988
  • 1988-03-30 WO PCT/FI1988/000045 patent/WO1988008097A1/en not_active Application Discontinuation
  • 1988-03-30 EP EP88903250A patent/EP0359750A1/de not_active Withdrawn
  • 1988-03-30 AU AU15770/88A patent/AU1577088A/en not_active Abandoned
  • 1988-04-07 CN CN198888101928A patent/CN88101928A/zh not_active Withdrawn
  • 1988-04-07 ES ES8801058A patent/ES2010255A6/es not_active Expired
  • 1988-11-26 KR KR1019880701548A patent/KR890700772A/ko not_active Application Discontinuation

Non-Patent Citations (1)

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