CN200960954Y

CN200960954Y - Truck head overturn air-actuated hydraulic cylinder

Info

Publication number: CN200960954Y
Application number: CN 200620005088
Authority: CN
Inventors: 林勇
Original assignee: 谢健萍
Priority date: 2006-02-06
Filing date: 2006-02-06
Publication date: 2007-10-17
Anticipated expiration: 2016-02-06

Abstract

The utility model discloses a novel truck head inverting air hydraulic cylinder including a connecting ring (1), a cylinder (2), a special-purpose cap nut (5), a helical spring (6), a return orifice check valve block (7), a spool (8), an O shape sealing ring (9), a plunger body (10), a stop sleeve (11), an annular tube (12), a main grease seal (13), a top bar (14), a guide bushing (15), a plunger rod (16), a connecting fork (17) and a hand ceiling switch (18). High press air in the truck head inverting air hydraulic cylinder pushes the plunger rod (16) to extend and drives roll upward within 0 to 45 degrees automatically by controlling the controlling switch on the truck head inverting air hydraulic cylinder, the truck head is capable of being locked at any position, the design is smart, the structure is rational, the utility model can be applied to truck head inverting air hydraulic cylinders of any trucks.

Description

Truck headstock upset pneumatic hydraulic cylinder

Technical field

The utility model relates to a kind of truck headstock upset pneumatic hydraulic cylinder.

Background technology

Domestic present truck headstock switching mechanism is mechanical torsion bar and hand-hydraulic jack type.Similar products are used for the lift adjustment of big bus back of seat.One-way throttle valve and spool are not set compress spring in advance, the switch of spool is the difference that relies on valve core diameter's size design, and be embedded in that " O " RunddichtringO cooperatively interacts in the piston body centre hole, thereby realize the switch purpose of spool, spool is under high pressure nitrogen pressure, big section of valve core diameter cooperates with the piston body centre hole is inserted in " O " RunddichtringO, compression " O " seal ring, chamber, piston body left and right sides medium can not be exchanged, pin piston rod, when external force is pushed up spool when valve core diameter's segment is in " O " RunddichtringO position, " O " RunddichtringO sky is enclosed within on valve core diameter's segment, makes the media implementation exchange of chamber, the piston body left and right sides, the piston rod retractable, the circle that above structure can cause being positioned at valve core diameter's big segment conversion place " O " RunddichtringO is repeatedly packed into the spool of extracting and is cut badly, makes seal failure; Similar products on the existing luxury bus back of seat, not long between in use, and do not have under the gas leakage situation, not moving switch, back of seat can be leaned on down, when external force disappears, back of seat return again original position, can't lock, Here it is " O " RunddichtringO lost efficacy and the defective that causes.

Summary of the invention

A kind of truck headstock upset pneumatic hydraulic cylinder that is provided propulsion source good sealing effect, piston rod effectively to pin in any position of stroke and be convenient to handle by high pressure gas is provided the purpose of this utility model.

For achieving the above object, truck headstock upset pneumatic hydraulic cylinder of the present utility model is by shackle, cylinder body, high pressure nitrogen, hydraulic oil, specialized nut, coil spring, one-way throttle valve, spool, " O " RunddichtringO, piston rod, interstage sleeve, sleeve pipe, main oil sealing, push rod, orienting sleeve, piston body, coupling yoke, manually pullswitch is formed, piston rod is captiveed joint with piston body and is inserted in the cylinder body, spool places in the piston body mesopore, push rod places in the piston rod mesopore, one end of push rod is connected with manual bit line switch, the other end of push rod withstands spool, the lower end of spool and a helical spring end in contact, the helical spring other end is pressed on the interior step of specialized nut, the one-way throttle valve block places below the interior coil spring of specialized nut, " O " RunddichtringO is enclosed within on the piston body, interstage sleeve places in the piston body mesopore, piston rod is pushed down interstage sleeve, interstage sleeve blocks the seal ring on the spool, sleeve pipe places between piston body and the orienting sleeve, piston rod passes orienting sleeve, main oil sealing places on the orienting sleeve, and coupling yoke 17 is connected with piston rod 16.

Truck headstock upset pneumatic hydraulic cylinder of the present utility model compared with prior art has following excellent effect:

Be filled with high pressure nitrogen in the cylinder body, hydraulic oil, spool is under high pressure nitrogen and helical spring pressure effect, its circular conical surface is pressed on the corresponding cylinder end face of piston body centre hole, form circular line contact, form bigger specific pressure, make the spool contact annulus place of making produce certain elastic deformation with non-metallic materials such as nylon, remedied the micro gap that causes because of the error in geometrical form of processing and roughness of surface etc., therefore, at the inside overhead-valve core of no certain external force, medium about its piston body in two chambeies can not exchange through the piston body centre hole, piston rod can pin and must not stretch in the optional position in it set stroke, pins unreliable this key issue thereby solved at all.When being applied to the inside external force of spool greater than high pressure nitrogen and helical spring pressure, spool is just opened, simultaneously, when the external force on being applied to piston rod was added in the internal motion friction of headstock upset pneumatic hydraulic cylinder own less than the pressure on the piston rod of high pressure nitrogen effect, piston rod will be to overhanging; External force on being applied to piston rod acts on piston rod pressure greater than high pressure nitrogen and adds the internal motion of headstock upset pneumatic hydraulic cylinder own can friction the time, and piston rod contracts toward in.The one-way throttle valve block external diameter that is placed in the specialized nut is slightly less than respective interior bores, is slightly larger than helical spring internal diameter, but about 1 millimeter of unidirectional joint recreation valve block side-to-side movement, play one-way throttle, promptly when piston rod contracts toward in, the medium in chamber, a cylinder body left side (back) is opened the one-way throttle valve block, medium enters chamber, the cylinder body right side (preceding) through one-way throttle valve block periphery porous, specialized nut and piston body centre hole, and speed can be very fast when piston rod contracted toward in.When piston rod when overhanging, the medium in chamber, the cylinder body right side (preceding) is pressed on the one-way throttle valve block on the end face of specialized nut endoporus, medium must enter through the aperture on the one-way throttle valve block cylinder body left side (after) chamber, so piston rod when overhanging speed slow, smooth-going soft.

The coil spring that is placed in the specialized nut keeps certain pressure to spool, play safety effect, even (prove from theory and practice because of quality problems cause the high pressure nitrogen leakage back in the body, high pressure nitrogen is than the easier leakage of hydraulic oil, and the time of hydraulic fluid leak has substantially exceeded the tenure of use of truck), spool is still closed chamber, the cylinder body right side (preceding) hydraulic oil, pinned piston rod, guaranteed vehicle under steam, upset had not improved safe reliability when headstock can not slow down because of sudden stop.

Description of drawings

Fig. 1 is the integrally-built plan sketch of the utility model truck headstock upset pneumatic hydraulic cylinder.

Fig. 2 is the plan sketch of A district after amplifying.

Fig. 3 is an one-way throttle valve structure scheme drawing.

Fig. 4 is a bus seat backrest hydraulic pressure recliner inner structure scheme drawing.

Be cylinder body wherein: 1) be shackle, 2), 3) be high pressure nitrogen, 4) be hydraulic oil, 5) be specialized nut.6) be coil spring, 7) be the one-way throttle valve block, 8) be spool, 9) be " O " RunddichtringO, 10) be piston body, 11) be interstage sleeve, 12) be sleeve pipe, 13) be main oil sealing, 14) be push rod, 15) be orienting sleeve, 16) be piston rod, 17) be coupling yoke, 18) be manual pullswitch.

The specific embodiment

Truck head upset pneumatic hydraulic cylinder shown in Figure 1 is made up of cylinder body 2, spool 8, piston body 10, piston rod 16, orienting sleeve 15, push rod 14, manual pullswitch 18, sleeve pipe 12, coil spring 6, specialized nut 5, one-way throttle valve block 7, coupling yoke 17, interstage sleeve 11, " O " RunddichtringO 9, shackle 1, main oil sealing 13.

Piston body 10 is inserted in the cylinder body 2, piston rod 16 is captiveed joint with piston body 10, spool 8 places in piston body 10 mesopores, push rod 14 places in piston rod 16 mesopores, one end of push rod 14 is connected with manual pullswitch 18, the other end of push rod 14 withstands spool, one end in contact of the lower end of spool 8 and coil spring 6, the other end of coil spring 6 is pressed on the interior step of specialized nut 5, one-way throttle valve block 7 places below the coil spring 6 in the specialized nut 5, " O " RunddichtringO 9 is enclosed within on the piston body 10, interstage sleeve 11 blocks the seal ring on the spool 8, sleeve pipe 12 places between piston body 10 and the orienting sleeve 15, piston rod 16 passes orienting sleeve 15, main oil sealing 13 places on the orienting sleeve 15, coupling yoke 17 is connected with piston rod 16, shackle 1 and cylinder body 2 welding, when the operator firmly holds handgrip on the moving pullswitch 18 of handling knob, backguy is contracted in teleflex, the bar of shouldering of manual pullswitch 18 other ends is moved push rod 14 promotion spools inward, open the interchange channel of the medium (high pressure nitrogen 3 and hydraulic oil 4) in the cylinder body, like this, piston rod 16 can stretch under the effect of external force or high pressure nitrogen 3, when the operator decontrols handgrip, spool 8 is under the effect of high pressure nitrogen 3, close the exchange energy road, piston rod 16 is lockable, thereby has finished entire work process.

Claims

1. truck headstock upset pneumatic hydraulic cylinder, by shackle (1), cylinder body (2), specialized nut (5), coil spring (6), one-way throttle valve block (7), spool (8), " O " RunddichtringO (9), piston body (10), interstage sleeve (11), sleeve pipe (12), main oil sealing (13), push rod (14), orienting sleeve (15), piston rod (16), coupling yoke (17), manually pullswitch (18) is formed, it is characterized in that piston rod (16) captives joint with piston body (10), be inserted in the cylinder body (2), spool (8) places in piston body (10) mesopore, push rod (14) places in piston rod (16) mesopore, one end of push rod (14) is connected with manual bit line switch (18), the other end of push rod (14) withstands spool (8), one end in contact of the lower end of spool (8) and coil spring (16), the other end of coil spring (16) is pressed on the interior step of specialized nut (5), one-way throttle valve block (17) places below the interior coil spring (6) of specialized nut (5), " O " RunddichtringO (9) is enclosed within on the piston body (10), interstage sleeve (11) places in piston body (10) mesopore, piston rod (16) is pushed down interstage sleeve (11), interstage sleeve (11) blocks the seal ring on the spool (8), sleeve pipe (12) places between piston body (10) and the orienting sleeve (15), piston rod (16) passes orienting sleeve (15), main oil sealing (13) places on the orienting sleeve (15), and coupling yoke (17) is connected with piston rod (16).

2. truck headstock according to claim 1 upset pneumatic hydraulic cylinder is characterized in that spool (8) one ends do coning, holds greater than piston body (10) mesopore greatly, and small end is less than piston body (10) mesopore.

3. truck headstock upset pneumatic hydraulic cylinder according to claim 1 is characterized in that spool (8) nylon material material material making, and piston body (10) is the circular line contact sealing of metallic material.