Electromechanical jack

FIELD: transport.

SUBSTANCE: invention relates to auxiliary devices used in machine building as jacks or liner motors. Hollow rod and lead screw nut are coupled by floating spherical support; bearing assembly is arranged in housing with clearance and has four symmetric rectangular slots that correspond to four through rectangular slots made on housing walls. Four locking bolts are arranged on housing outer surface entered into bearing assembly slots with clearance to lock said assembly axially to allow it displacing radially relative to housing axis.

EFFECT: lower radial force component on lead screw and reduced requirements to precision of manufacturing jack mating parts, longer life.

3 cl, 1 dwg

 

The invention relates to power devices engineering structures used as jacks or linear motors, in particular, may find application as a power element in the construction of the outriggers (outriggers) for leveling, stability and unloading chassis lifting machines or platforms with long-commit mode of their position.

A known design of a hydraulic Jack (SU 1694474 A2, 18.12.1989, - 2 c.), containing a body placed in it a piston with a hollow stem and a locking mechanism made in the form of dvuhsvetnyj connected coil pairs of equal step with Sanatornaya and nasmotrevshayasya threads, additional piston mounted in the bore of the nut, with the possibility of axial movement relative to the rod, and the nut is sealed relative to the housing, and the housing provided with inlet and outlet channels communicated with the bore. In the hollow rod set bearing, which interacts with the output element and has an axial backlash, the value of which is less than the axial play nasmotrevshayasya screw pair. Screw nasmotrevshayasya pair still fixed in the housing, and a hollow stem slidably connected by means of nasmotrevshayasya thread with this screw. This device has several disadvantages, namely considerable dimensions and the open thread on the housing, what complicates its use in mobile installations and field conditions. In addition, as with any hydraulic device, this technical solution is the inherent lack of reliability associated with the presence of a large number of mobile and fixed elastic seals, flexible hoses, the aging of the sealing material and the working fluid, which may cause leakage, blockage of hydraulic lines and the output of the entire system to fail.

The closest to the essential features of the invention is a technical solution Electromechanical screw Jack for a utility model certificate RU # 85462 (publ. 10.08.2009 by application No. 2007138368/22, 16.10.2007)adopted for the prototype. Electromechanical screw Jack-prototype includes a housing mounted on the housing of the geared motor connected to the output shaft of the gear lead screw, and a hollow stem, its outer surface with a gap telescopically mating with the housing. The lower part of the hollow rod through the hinge fixed on the base of the Shoe, and in the upper part of the hollow rod made internal thread, whereby the hollow shaft mates with the lead screw. The profiles of the cross section of the inner surface of the telescopic section of the housing and telescopically Sprague is camping with her outer surface of the hollow rod have a square cross section, moreover, the outer side surface of the hollow shaft, the mating with the case fitted with rolling bearings.

As follows from the description and drawing of the prototype, the design incorporates hard-dimensional binding to the axis of the housing five mating pairs of nodes, namely, the gear - casing, the output shaft of the gearbox - lead screw, lead screw, hollow rod, lead screw housing, a hollow rod - building. The efficiency of this design can only be achieved when there is a minimum guaranteed gaps in all of these mates that are problematic at high loads, with both axial and radial (transverse) component. In addition, this design requires a high technological manufacturing precision parts, which increases its cost in mass production. These features of the prototype are his weaknesses.

The invention has as its purpose the improvement of the design of Electromechanical Jack. When using the invention are achieved by the following technical results:

1. Reduced radial component of efforts on the pilot screw.

2. Reduced processing requirements to precision moving the mating parts of the Jack.

3. Ensures longer service life of Jack

The invention consists in the following is relevant: Electromechanical Jack which includes a housing with a square cross-sectional profile of the inner surface mounted on the housing of the electric motor with a gear connected with the output shaft of the gear lead screw, rests with its upper part in the bearing unit, which is fixed in the housing, includes in itself the hollow stem, its outer surface with a gap telescopically mating with the housing, and the lower part of the hollow rod through the hinge strengthened in the bearing Shoe and the upper part is connected with a nut, bearing on its lateral surface of the support roller has distinctive features, namely: the hollow rod, and a nut connected between by floating spherical bearing, bearing unit accommodated in the housing with a gap and symmetrically made four rectangular groove, respectively, which through four rectangular groove made in the walls of the case and the outer surface of the shell four fortified biscuit-bolt, elements are introduced through the slots of the housing and come with clearances in the grooves of the bearing unit, fixing this node in the axial direction, with the possibility of its displacement in radial directions relative to the body axis.

Marked the invention is associated with the stated technical results are as follows, respectively:

1 the Use of spherical bearings, connecting the nut and the hollow shaft, provides unloading screw from bending and from the radial component of the efforts transmitted in the prototype with a hollow rod through the nut on the screw. This effort is now perceived nut and balanced reaction to a support roller nut from the inner walls of the shell.

2, 3. The ball bearing unit Jack is floating in radial directions, ensuring adjust to any misalignment of this node in the initial phase of loading Jack, so inaccuracies of manufacture of the nut and the inner surface of the housing, as well as operational wear these sites Jack will not lead to cracking and failure. Thus, the reduced processing requirements to precision moving the mating parts of the Jack and increases its service life.

The drawing shows an Electromechanical Jack.

Electromechanical Jack includes a housing (1) with a square cross-sectional profile of the inner surface mounted on the housing of the electric motor (2) with gear (3)connected with the output shaft of the gear lead screw (4), rests with its upper part in the bearing unit (5)which is fixed in the housing (1)includes in itself the hollow shaft (6), its outer surface with a gap telescopically connecting the I casing (1) through the sleeve (7), moreover, the lower part of the hollow shaft (6) via a hinge (8) mounted in the bearing Shoe (9), and its upper extremity is made in the form of a mushroom (10) with a Central hole. The liner (11) and fungi (10) mate on the spherical surface, forming a spherical bearing. In the nut (12) of the insert (11) abuts against the plane perpendicular to the axis of the nut, and insert (11) and fungi (10) of the hollow shaft (6) is placed in the bore of the nut (12) with a radial clearance, which ensures the possibility of radial displacement (swimming) spherical bearing within the specified gap. The hollow shaft (6) with the fungus (10) and the insert (11) is fixed in the nut (12) using the locking ring (13). Nut (12) carries on its lateral surface of the support roller (14). Bearing unit (5) accommodated in the housing (1) with a gap (15), and symmetrically made four rectangular groove (16), respectively, which through four rectangular groove (17) made in the walls of the housing (1), and on the outer surface of the housing (1) four fortified biscuit-bolt (18), the elements of which entered through the slots (17) of the housing and come with radial and tangential gaps in the grooves (16) of the bearing unit (5), fixing this node in the axial direction (axial clearances not functional and is made minimum, can be used, for example, planting H8/h8 or H8/g8), with the possibility of displacement of the bearing unit (5) in idealnych directions relative to the axis of the housing (1) within the specified radial and tangential gaps. The housing (1) mounted and fixed in the axial direction in the bearing structure (19), for example, in the frame of the vehicle, by means of the elements (20), similar to breadcrumbs-bolts (18)inserted into the deaf (blind) grooves in the walls of the housing (1).

Electromechanical Jack works as follows. Torque from the electric motor (2) via a gearbox (3) is transmitted to the lead screw (4), which rotates in the threaded nut (12), tells her the translational movement relative to the housing (1). Square cross-section profiles of the inner surface of the telescopic section of the housing (1) and mating with her outer surface of the nut (12) prevent axial rotation of the nut (12), and circumferential (tangential) force from the side of the lead screw (4) perceived nut (12) and is balanced by the reaction on the bearings (14) nut (12) from the inner walls of the housing (1). The hollow shaft (6), resting its upper part through the liner (11) nut (12)and the lower part via a hinge (8) in the support Shoe (9), transmits the axial force on the nut (12), which passes it on lead screw (4), which, in turn, transmits the force on the bearing unit (5). Elements, closing the power circuit to the housing (1)are the four rusk-bolt (18), retaining bearing unit (5) from axial movement relative to the housing (1), while radiation is inoe movement of the bearing unit (5) is possible within the radial and tangential structural gaps, i.e. bearing unit (5) is floating and can samoustraniajutsia in the initial phase of loading on the screw (4), which ensures the discharge of the coupling screw (4) nut (12) from the bending moment and radial forces and prevents jamming of the coupling under load. Because the insert (11) is designed as floating in the nut (12), the initial phase of loading is adjust to any misalignment of the hollow shaft (6) relative to the housing (1)which provides a discharge mates hollow shaft (6) - case (1) in the bottom of the sleeve (7) from the bending moment and radial forces and prevents jamming of this pair under load. Through the elements (20) the axial force is transferred from the body of the Jack (1) on the supporting structure (19). During the reverse course of the Jack, the connection of the hollow shaft (6) with nut (12) is provided with a stop ring (13). Due to the fact that the above-described internal power support Jack made floating, is the reduction of the technological requirements to precision moving the mating parts of the Jack and increasing its service life. Inaccuracies of manufacture of the nut and the inner surface of the housing, as well as operational wear these sites Jack will not lead to seizure, the seizure of movable surfaces and the output Jack of the system.

1. Electromechanical on mcrat, which includes a housing with a square cross-sectional profile of the inner surface mounted on the housing of the electric motor with a gear connected with the output shaft of the gear lead screw, rests with its upper part in the bearing unit, which is fixed in the housing also includes a hollow stem, its outer surface with a gap telescopically mating with the housing, and the lower part of the hollow rod through the hinge strengthened in the bearing Shoe and the upper part is connected with a nut, bearing on its lateral surface of the support roller, wherein the hollow rod and nut are interconnected by a floating spherical bearing, bearing unit accommodated in the housing with a gap and symmetrically made four rectangular groove, respectively, which through four rectangular groove made in the walls of the case and the outer surface of the shell four fortified biscuit-bolt, elements are introduced through the slots of the housing and come with clearances in the grooves of the bearing unit, fixing this node in the axial direction, with the possibility of its displacement in radial directions relative to the body axis.

2. Electromechanical Jack according to claim 1, characterized in that the inside of the Jack is made grooves for fixing it in the supporting structure.

Alectryomancy Jack according to claim 1, characterized in that the floating spherical bearing formed by the extremity of the hollow rod, made in the form of a mushroom with a Central hole, and an insert that mates with the fungus hollow rod on the spherical surface, and with the nut insert is mated with a plane perpendicular to the axis of the nut, and insert and mushroom tip of the hollow rod is placed in the bore of the nut with radial clearance and is fixed by a locking ring.



 

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