CN209340255U - Excavator oscillating oil cylinder - Google Patents

Abstract

The utility model provides a kind of excavator oscillating oil cylinder, comprising: cylinder body, piston, rotary shaft, first flange, second flange, bidirectional relief valve, two self-lubricating bearings, piston driving rotary shaft are rotated relative to cylinder body；The both ends of cylinder body are provided with step；Two self-lubricating bearings are separately mounted to the both ends of cavity and on steps；First flange and second flange are separately mounted in the self-lubricating bearing inner hole at both ends；Rotary shaft is connected with first flange and second flange, rotary shaft is internally provided with chamber, the first overflow ducts and the second overflow ducts are had in rotary shaft, bidirectional relief valve is mounted in chamber, and the first interface and second interface of bidirectional relief valve are connected with the first overflow ducts and the second overflow ducts respectively.The inside that bidirectional relief valve is mounted on to rotary shaft of the utility model excavator oscillating oil cylinder, it is compact-sized, and self-lubricating bearing is installed between first flange, second flange and cylinder body, bearing capacity is big, runs smoothly.

Description

Excavator oscillating oil cylinder

Technical field

The utility model belongs to oscillating oil cylinder field, and in particular to a kind of excavator oscillating oil cylinder.

Background technique

Oscillating oil cylinder is an important auxiliary equipment of engineering machinery, field, is made in the process of work using hydraulic coupling Oil cylinder rotary shaft rotates by a certain angle relative to cylinder block, is commonly used in excavator and realizes the left and right pendulum of bucket or accessory It is dynamic, to meet job requirements of the excavator in small space.Existing excavator is mostly installed outside cylinder body with oscillating oil cylinder Overflow valve, this structure overflow valve is prominent not only to increase oil cylinder volume outside cylinder body, be also easy in operation process because It collides with and damages, to influence normal digging operation.In addition piston is moving back and forth in existing excavator oscillating oil cylinder When, cylinder body and rotary shaft can be also scratched, interior leakage occurs, reduces efficiency or even disabler.In addition rotary shaft in the prior art It is directly installed in cylinder body, not only bearing capacity is poor, but also the friction between cylinder body and rotary shaft is big, serious wear, occurs more It is stuck, rotation failure.

Utility model content

In view of the foregoing deficiencies of prior art, it is oily with swinging that the purpose of this utility model is to provide a kind of excavators Cylinder, larger with oscillating oil cylinder cylinder body for solving excavator in the prior art, overflow valve is mounted on easily damaged, cylinder outside cylinder body The serious problem of abrasion between body and rotary shaft.

In order to achieve the above objects and other related objects, the utility model provides a kind of excavator oscillating oil cylinder, comprising: Cylinder body, piston, rotary shaft, first flange, second flange, bidirectional relief valve, two self-lubricating bearings；The rotary shaft can be rotated Be mounted in the cavity of the cylinder body, the piston is mounted in the hydraulic cavities between the cylinder body and the rotary shaft, and The rotary shaft can be driven to rotate relative to the cylinder body when reciprocating linear is mobile, the cavity both ends of the cylinder body are provided with Step, the radial width of the step are greater than the radial thickness of the self-lubricating bearing；Two self-lubricating bearings are pacified respectively Mounted in the cavity both ends and bear against on the step；The first flange and the second flange are separately mounted to two In the self-lubricating bearing inner hole at end, and end face is born against on the step at both ends；Described two self-lubricating bearings Rotating seal is mounted between outer first flange and the cylinder body and between the second flange and the cylinder body；Institute The both ends for stating rotary shaft are connected with the first flange and the second flange respectively, and the rotary shaft is internally provided with energy The chamber for enough accommodating the bidirectional relief valve, had in the rotary shaft of the piston two sides the first overflow ducts and Second overflow ducts, first overflow ducts and the second overflow ducts are arranged in except the shift motion of the piston, described Bidirectional relief valve is mounted in the chamber, and the first interface of the bidirectional relief valve is connected with first overflow ducts, The second interface of the bidirectional relief valve is connected with second overflow ducts.

Preferably, between the piston and the cylinder body, being respectively arranged between the piston and the rotary shaft can Increase the support ring of Plunger stability.

Preferably, plug is also equipped on the chamber.

Preferably, the position that the bidirectional relief valve first interface is corresponded in the rotary shaft is provided with cricoid remittance oil Slot.

Further, the second flange is detachably arranged in the rotary shaft.

Preferably, the bidirectional relief valve includes valve body, spool, compression spring；The outside of the valve body is provided with installation Screw thread；One end of the valve body is provided with interconnecting piece that can be mutually direct-connected with screwing tool；The second interface is provided with described On the end face of the valve body other end, the first interface is provided on the side wall of the valve body other end, the second interface and institute First interface is stated to be connected with the valve chamber of the valve body；First to match with the valve chamber is disposed on the spool Seal, the pressure bearing step being recessed to central side, the second seal to match with the second interface；The spool can straight line Mobile is mounted in the valve chamber, first seal in the entire moving process of the spool equal sealed extruded in institute It states on valve chamber inner wall, the compression spring is mounted in the valve chamber, and a side end is mounted on the valve body, another side Portion's compression spool is by the second seal sealing blocking in the second interface.

Further, the first interface has multiple, and multiple first interfaces are uniformly distributed along the circumference, the rotary shaft and/ Or the positions of multiple first interfaces is corresponded on the valve body and is provided with remittance oil groove.

Further, the bidirectional relief valve further includes pressure regulating part, and the oscillating oil cylinder is also wrapped with bidirectional relief valve Pressure regulating part is included, the pressure regulating part includes spring base and lock body, and the spring base threaded connection is mounted on the valve Intracavitary, the compression spring is mounted on the spring base, and screwing the spring base can compress the compression spring or discharge, The lock body is mounted on the valve body and holds out against the spring base and is locked on the valve body.

Further, the side of the spring base is provided with interior six side's grooves, and the other side is provided with and the pressure bullet The first spring positioning boss that spring inner hole matches, the compression spring are mounted on the spring positioning boss.

As described above, bidirectional relief valve is mounted on the inside of rotary shaft with oscillating oil cylinder by the utility model excavator, and Pass through the first interface and second interface on the first overflow ducts of interior of rotating shaft and the second overflow ducts and bidirectional relief valve It is connected, it is compact-sized, easily manufactured, and preferably bidirectional relief valve can be protected, highly-safe, installation side Just, run smoothly.In addition self-lubricating bearing is installed between the first flange, second flange and cylinder body of the utility model, carries Power is big, runs smoothly, and the end face of first flange and second flange stretches in hydraulic cavities and positioned by step, such hydraulic cavities Interior hydraulic oil can lubricate end face and step, it is possible to reduce the pivoting friction between end face and step.

Between the piston and cylinder body of the utility model, piston can be increased by being respectively arranged between piston and the rotary shaft The support ring of stability not only increases the mobile stability of piston, also can effectively prevent piston in moving process to cylinder body With the abrasion of rotary shaft, transfer efficiency is improved, piston seal failure can be effectively prevent.

The external screw thread for installation is provided with outside the valve body of bidirectional relief valve described in the utility model；On the valve body It is provided with interconnecting piece that can be mutually direct-connected with screwing tool, does not need too big installation space, it is more compact in structure, it installs Come it is also more convenient, in addition bidirectional relief valve described in the utility model only with a spool, on the spool successively It is provided with the first seal to match with the valve chamber, the pressure bearing step being recessed to central side, matches with the second interface The second seal；When the piston two sides indoor pressure of any one chamber is exceeded, it can push spool mobile, make first interface It being connected to second interface and unload stream, the bidirectional flooding valve arrangement in the utility model is simple, and it is small in size, can very easily it pacify Mounted in interior of rotating shaft.

Detailed description of the invention

Fig. 1 is the structure chart of the utility model embodiment 1；

Fig. 2 is the partial enlarged view in the region I in Fig. 1；

Fig. 3 is the structure chart of bidirectional relief valve in the utility model embodiment 2；

Fig. 4 is the hydraulic schematic diagram of bidirectional relief valve in the utility model embodiment 2.

In figure: 1, bidirectional relief valve；2, cylinder body；3, rotary shaft；4, piston；5, first flange；6, second flange； 7a/ 7b, self-lubricating bearing；8, support ring；9, plug；10, rotating seal；11, valve body；12, compression spring；13, spool；14, Spring base；15, lock body；16, sealing element；111, valve chamber；112, screw thread is installed；113, interconnecting piece；114, second interface；115, First interface；116, remittance oil groove；131, the first seal；132, pressure bearing step；133, the second seal；141, interior six side is recessed Slot；142, positioning convex platform；21/22, step；23/42, internal screw tooth；31, chamber；32, the first overflow ducts；33, the second overflow Channel；331, the second overflow ducts a；332, the second overflow ducts b；34, remittance oil groove；35, sealing element；36/41 external spiral tooth.

Specific embodiment

Structure depicted in Figure of description, ratio, size etc., only to cooperate the revealed content of specification, with Understand for those skilled in the art and read, is not intended to limit the utility model enforceable qualifications, therefore does not have skill Essential meaning in art, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing the utility model institute Under the effect of capable of generating and the purpose that can reach, it should all still fall in what the revealed technology contents of the utility model can be covered In range.Meanwhile cited such as "upper", "lower", "front", "rear", " centre " term in this specification, it is merely convenient to chat That states is illustrated, rather than to limit the enforceable range of the utility model, relativeness is altered or modified, without substantive change Under more technology contents, when being also considered as the enforceable scope of the utility model.

Embodiment 1

As shown in Figs. 1-2, the utility model provides a kind of excavator oscillating oil cylinder, comprising: cylinder body 2, piston 4, rotation Axis 3, bidirectional relief valve 1, first flange 5, second flange 6, self-lubricating bearing 7a, self-lubricating bearing 7b, rotary shaft 3 are rotatable It is mounted in the cavity of cylinder body 2, internal screw tooth 23 is provided in cylinder body 2, internal screw tooth 42 and external spiral tooth are provided on piston 4 41, rotary shaft 3 is equipped with external spiral tooth 36, closed hydraulic cavities is formed between cylinder body 2 and rotary shaft 3, piston 4 is mounted on hydraulic It is intracavitary and drive rotary shaft 3 relative to cylinder by internal screw tooth 42 on piston 4 and external spiral tooth 41 when reciprocating linear is mobile Body 2 rotates, and the cavity both ends of cylinder body 2 are provided with step 21 and step 22, the radial width of step 21 and step 22 be greater than from Lubricate the radial thickness of bearing 7a and self-lubricating bearing 7b；Self-lubricating bearing 7a is mounted on one end of cavity and against step 21 On, self-lubricating bearing 7b is mounted on the other end of cavity and on step 22；First flange 5 is mounted on self-lubricating bearing 7a Interior, end face is resisted against on step 21, and second flange 6 is mounted in self-lubricating bearing 7b inner hole, and end face is resisted against on step 22； Between first flange and the cylinder body outside self-lubricating bearing 7a and the second flange 6 outside self-lubricating bearing 7b and between cylinder body 2 It is mounted on rotating seal 10；The both ends of rotary shaft 3 are connected with first flange 5 and second flange 6 respectively；Rotary shaft 3 It is internally provided with the chamber 31 that can accommodate bidirectional relief valve 1, has the first overflow in the rotary shaft 3 of 4 two sides of piston Channel 32 and the second overflow ducts 33, the second overflow ducts 33 include the second overflow ducts a331 and the second overflow ducts b332, The oil inlet of first overflow ducts 32 and the second overflow ducts 33 is arranged except 4 shift motion of piston, and bidirectional relief valve 1 is pacified In chamber 31, the first interface of bidirectional relief valve 1 is connected with the first overflow ducts 32, and the second of bidirectional relief valve 1 connects Mouth is connected with the second overflow ducts 33.

Bidirectional relief valve 1 is mounted on the inside of rotary shaft 3 by the utility model excavator oscillating oil cylinder, is swung to realize The two-way overload protective of oil cylinder, it is not only compact-sized, easily manufactured, but also preferably bidirectional relief valve 1 can be protected, It is highly-safe, easy for installation, run smoothly.In addition it is installed between the first flange 5, second flange 6 and cylinder body 2 of the utility model There are self-lubricating bearing 7a and 7b, it is small in size, it rubs small, abrasion resistance properties are excellent, and bearing capacity is big, it runs smoothly, 5 He of first flange The end face of second flange 6 stretches to be positioned in hydraulic cavities and respectively by step 21 and step 22, hydraulic in such hydraulic cavities Oil can enter the gap between end face and step, it is possible to reduce the pivoting friction between end face and step.

Piston 4 in the utility model can use common 4 form of piston of hydraulic cylinder, but in the present embodiment piston 4 with Between cylinder body 2, the support ring 8 that can increase by 4 stability of piston is respectively arranged between piston 4 and rotary shaft 3.It not only increases The mobile stability of piston 4, also can effectively prevent abrasion of the piston 4 in moving process to cylinder body 2 and rotary shaft 3, improves Transfer efficiency can effectively prevent 4 seal failure of piston.Support ring 8 is clamping cloth phenolic aldehyde material, and surface design has multiple small Sunk structure is used to retain fluid, provides the lubrication to support ring.Support ring in the present embodiment can bear very high lateral Load avoids directly contacting between metal.

Dust enters in bidirectional relief valve 1 in order to prevent, and the end of rotary shaft 3 is also equipped in the present embodiment overflows two-way It flows valve 1 and blocks the plug 9 in chamber 31.

Remittance oil groove can be not provided in the rotary shaft 3 of the utility model, but in view of on existing commercially available bidirectional relief valve 1 Do not converge tank structure, when installation can only adjust being aligned for the first overflow ducts 32 and first interface 115 by gasket, in order to subtract Lack adjustment difficulty, the position for corresponding to 1 first interface 115 of bidirectional relief valve in this implementation in rotary shaft 3 is provided with cricoid remittance oil Slot 34.Even the first overflow ducts 32 are not aligned with first interface 115 in this way, the hydraulic oil meeting in the first overflow ducts 32 The oil groove 34 that converged enters in valve body 11 through first interface 115 again after converging.Hydraulic oil is leaked along axis in order to prevent, remittance oil groove 34 Two sides are provided with sealing element 35.

Embodiment 2

As shown in Figs 1-4, the present embodiment and the difference of embodiment 1 are, the bidirectional relief valve 1 in embodiment 1 is existing Commercially available conventional structure, its structure is complicated, and installation space is big, and the bidirectional relief valve 1 in the present embodiment includes valve body 11, spool 13, compression spring 12；The outside of valve body 11 is provided with installation screw thread 112；One end of valve body 11 is provided with can be with screwing tool Mutually direct-connected interconnecting piece 113 (interior six sides groove)；Second interface 114 is offered on the end face of 11 other end of valve body, valve body 11 is another Offer at least one first interface 115 on the side wall of one end, second interface 114 and at least one first interface 115 are and valve The valve chamber 111 of body 11 is connected；The first seal 131, recessed to central side to match with valve chamber 111 is disposed on spool 13 The second seal 133 that sunken pressure bearing step 132 and second interface 114 match；Spool 13 is movable linearly to be mounted on In valve chamber 111, equal sealed extruded is on 111 inner wall of valve chamber in the entire moving process of spool 13 for the first seal 131, pressure Spring 12 is mounted in valve chamber 111, and a side end of compression spring 12 is mounted on valve body 11, and end side compresses spool 13 By 133 sealing blocking of the second seal in second interface 114.

Installation screw thread 112 is provided in the present embodiment outside the valve body 11 of bidirectional relief valve 1, being provided on valve body 11 can The interconnecting piece 113 mutually direct-connected with screwing tool, when installation, do not need too big installation space, more compact in structure, install Come it is also more convenient, in addition the utility model bidirectional relief valve 1 only with a spool 13, set gradually on spool 13 There are the first seal 131 to match with valve chamber 111, the pressure bearing step 132 being recessed to central side, match with second interface 114 The second seal 133；When the pressure in any one chamber 31 of 4 two sides of piston is exceeded, it can push spool 13 mobile, make First interface 115 is connected to second interface 114 unload stream, and 1 structure of bidirectional relief valve in the utility model is simple, volume It is small, it can very easily be mounted on inside rotary shaft 3.

115 quantity of first interface of the utility model is not limited in principle, and cushioning adjustment during installation is only needed to make first Interface 115 is connected with the first overflow ducts 32, but the convenience in view of adjusting, in the present embodiment there are six settings First interface 115, six first interfaces 115 are uniformly distributed along the circumference on valve body 11, corresponding six first interfaces 115 in rotary shaft 3 Position be provided with cricoid remittance oil groove 34, corresponded on valve body 11 first interface 115 position be provided with converge oil groove 116.It converges oily The two sides of slot 116 are equipped with sealing element 16, after the hydraulic oil in the first overflow ducts 32 collects in remittance oil groove, and connect from first The pressure, when the pressure overload in 4 left chamber 31 of piston, poured in first interface 115 in valve chambers 111 are flowed into mouth 115 Oil pushes pressure bearing step 132, and 13 compressive pressure spring 12 of spool retraction, first interface 115 is connected to second interface 114 at this time, Carry out decompression protection.When the pressure overload in 4 right chamber 31 of piston, the pressure oil poured in second interface 114 pushes valve 13 end face of core, 13 compressive pressure spring 12 of spool retraction, first interface 115 is connected to second interface 114 at this time, carries out pressure release guarantor Shield.

For the ease of adjusting the setting vent pressure of compression spring 12, bidirectional relief valve 1 further includes pressure in the present embodiment Adjustment portion, oscillating oil cylinder bidirectional relief valve 1 further include pressure regulating part, and pressure regulating part includes spring base 14 and lock body 15, the threaded connection of spring base 14 is mounted in valve chamber 111, and one end of compression spring 12 is mounted on spring base 14, and the other end supports By compressing 13 end of spool, screwing spring base 14 can compress compression spring 12 or discharge, and lock body 15 is mounted on valve body 11 And radially go deep into valve body 11 holding out against spring base 14 being locked on valve body 11.Lock body 15 in the present embodiment is clamp screw Bolt.

For the ease of adjusting, minification, the side of spring base 14 is provided with interior six side's grooves 141, and the other side is provided with The positioning convex platform 142 to match with 12 inner hole of compression spring, compression spring 12 are mounted on spring positioning boss 142.

In conclusion bidirectional relief valve is mounted on the inside of rotary shaft with oscillating oil cylinder by the utility model excavator, knot Structure is compact, easily manufactured, and can preferably protect to bidirectional relief valve, and highly-safe, easy for installation, operation is put down Surely.There are also self-lubricating bearing is equipped between rotary body, small in size, friction is small, and wear-resistant, bearing capacity is big, runs smoothly.Institute With the utility model effectively overcomes some practical problems in the prior art to there is very high utility value and using meaning Justice.

Above embodiment is only illustrative of the principle and efficacy of the utility model, and not for limitation, this is practical new Type.The utility model can be improved there are many more aspect under the premise of without prejudice to overall thought, for being familiar with this technology Personage can all be carried out modifications and changes to above-described embodiment under the spirit and scope without prejudice to the utility model.Therefore, Such as those of ordinary skill in the art is in spirit revealed without departing from the utility model and institute under technical idea All equivalent modifications or change completed, should be covered by the claim of the utility model.

Claims (7)

1. a kind of excavator oscillating oil cylinder, comprising: cylinder body, piston, rotary shaft, the rotary shaft are rotatably mounted on described In the cavity of cylinder body, the piston is mounted in the hydraulic cavities between the cylinder body and the rotary shaft, and can be in reciprocating linear The rotary shaft is driven to rotate relative to the cylinder body when mobile, which is characterized in that further include: it is first flange, second flange, double To overflow valve, two self-lubricating bearings；The cavity both ends of the cylinder body are provided with step, and the radial width of the step is greater than The radial thickness of the self-lubricating bearing；Two self-lubricating bearings are separately mounted to the both ends of the cavity and bear against On the step；The first flange and the second flange are separately mounted in the self-lubricating bearing inner hole at both ends, and End face is born against on the step at both ends；Between first flange and the cylinder body outside described two self-lubricating bearings, And rotating seal is mounted between the second flange and the cylinder body；The both ends of the rotary shaft are respectively with described first Flange is connected with the second flange, and the rotary shaft is internally provided with the chamber that can accommodate the bidirectional relief valve, The first overflow ducts and the second overflow ducts are had in the rotary shaft of the piston two sides, first overflow is logical Road and the second overflow ducts are arranged in except the shift motion of the piston, and the bidirectional relief valve is mounted in the chamber, The first interface of the bidirectional relief valve is connected with first overflow ducts, the second interface of the bidirectional relief valve and institute The second overflow ducts are stated to be connected.

2. excavator oscillating oil cylinder according to claim 1, which is characterized in that between the piston and the cylinder body, The support ring that can increase Plunger stability is respectively arranged between the piston and the rotary shaft.

3. excavator oscillating oil cylinder according to claim 1, which is characterized in that be also equipped with plug on the chamber.

4. excavator oscillating oil cylinder according to claim 1, which is characterized in that corresponded in the rotary shaft described two-way The position of overflow valve first interface is provided with cricoid remittance oil groove.

5. excavator oscillating oil cylinder according to claim 1, which is characterized in that the bidirectional relief valve include valve body, Spool, compression spring；The outside of the valve body is provided with installation screw thread；One end of the valve body is provided with can be with screwing tool Mutually direct-connected interconnecting piece；The second interface is provided on the end face of the valve body other end, and the first interface is provided with institute On the side wall for stating the valve body other end, the second interface and the first interface are connected with the valve chamber of the valve body；It is described The pressure bearing step and described second for being disposed with the first seal to match with the valve chamber on spool, being recessed to central side The second seal that interface matches；The spool is movable linearly to be mounted in the valve chamber, and first seal exists For equal sealed extruded on the valve chamber inner wall, the compression spring is mounted on the valve chamber in the entire moving process of the spool It is interior, and a side end is mounted on the valve body, end side compresses the spool for the second seal sealing blocking In the second interface.

6. excavator oscillating oil cylinder according to claim 5, which is characterized in that the first interface have it is multiple, it is multiple The first interface is uniformly distributed along the circumference, and the position that multiple first interfaces are corresponded in the rotary shaft and/or the valve body is set It is equipped with remittance oil groove.

7. excavator oscillating oil cylinder according to claim 6, which is characterized in that the oscillating oil cylinder bidirectional relief valve It further include pressure regulating part, the pressure regulating part includes spring base and lock body, and the spring base threaded connection is mounted on institute State in valve chamber, the compression spring is mounted on the spring base, screw the spring base compression spring can be compressed or Release, the lock body are mounted on the valve body and hold out against the spring base and be locked on the valve body.