CN215059270U - Lead screw transmission clearance eliminating mechanism - Google Patents

Abstract

The utility model belongs to the technical field of screw drive, a screw drive clearance that disappears mechanism is disclosed, including drive screw, drive nut, the clearance nut that disappears, drive sprocket and elastic component, drive nut and the clearance nut that disappears all are connected with drive screw thread fit, and the drive sprocket clamp is established between drive nut and the clearance nut that disappears, and on the clearance nut that disappears was located to the elastic component, the elastic component was worn to establish in proper order, the clearance nut that disappears, drive sprocket and drive nut and fix on drive nut to the one end of connecting piece, and the elastic component is in elastic state all the time. The utility model discloses a set up the elastic component in the crack nut that disappears and make the elastic component be in elastic state all the time, when forward and reverse drive, the cooperation is hugged closely constantly to transmission nut and crack nut that disappears all with drive screw's upper and lower subtend helicoid, and the movable cross beam of being convenient for realizes relapseing zero clearance motion to the jack stroke not enough problem of screw drive in-process has been solved.

Description

Lead screw transmission clearance eliminating mechanism

Technical Field

The utility model relates to a lead screw drive technical field especially relates to a lead screw drive clearance that disappears mechanism.

Background

The counter-force frame of the jack calibrating device adopts a four-upright-column screw rod structure, the four upright-column screw rods synchronously ascend and descend, the rigidity is required to be good, the stability is good, and the cross beam can move up and down to adjust the size of a test space. When the reaction frame is not tested, the dead weight of the cross beam of the reaction frame is born by the anti-backlash nut, when the test is carried out, the jack force borne in the reaction frame is greater than the dead weight of the cross beam, and the cross beam bears the test support reaction force of the jack and is opposite to the dead weight, so that when the transmission is carried out, the position change and the stress change between the cross beam and the anti-backlash nut can certainly influence the stroke precision of the jack.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a screw drive crack mechanism that disappears to solve the not enough problem of jack stroke precision among the screw drive process.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a lead screw drive clearance mechanism that disappears, include:

the transmission screw rod is provided with an external thread, and one end of the transmission screw rod is a fixed end;

the inner thread of the transmission nut is matched and connected with the outer thread of the transmission screw rod, a transmission cross beam is arranged on the outer side of the transmission nut, and the transmission nut is connected with the transmission cross beam through a self-aligning bearing;

the internal thread of the anti-backlash nut is matched and connected with the external thread of the transmission screw rod, and the anti-backlash nut is far away from the fixed end on the transmission screw rod relative to the transmission nut;

the driving chain wheel is clamped between the transmission nut and the anti-backlash nut;

the elastic piece is arranged on the gap eliminating nut, one end of the connecting piece sequentially penetrates through the elastic piece, the gap eliminating nut, the driving chain wheel and the transmission nut and is fixed on the transmission nut, and the elastic piece is always in an elastic state.

Optionally, the elastic member is a disc spring.

Optionally, the lead screw transmission anti-backlash mechanism further comprises a base, and the fixed end of the transmission lead screw is fixed on the base.

Optionally, be equipped with the through-hole on the base, drive screw the stiff end is worn to establish in the through-hole, just the both ends of through-hole are equipped with lock nut respectively in order to fix drive screw in the through-hole.

Optionally, the self-aligning bearing is arranged at the upper end and the lower end of the transmission cross beam, the self-aligning bearing at the upper end position can be stopped against the step surface of the transmission nut, the self-aligning bearing at the lower end position is clamped and fixed through an adjusting nut, and the internal thread of the adjusting nut is matched and connected with the external thread of the transmission nut.

Optionally, the screw transmission clearance eliminating mechanism further comprises a washer, and the washer is arranged on the transmission nut in a penetrating mode and is arranged between the adjusting nut and the self-aligning bearing.

Optionally, inner cylindrical surfaces are arranged on inner side walls of the upper end and the lower end of the transmission nut, and the inner cylindrical surfaces are matched with an outer circle of the transmission screw rod.

Optionally, the number of the transmission screw rods is four, the four transmission screw rods are arranged at intervals and fixed on the same base, and one transmission cross beam is simultaneously installed on the four transmission screw rods through the transmission nuts.

Optionally, the external thread on the drive screw is a trapezoidal thread.

Optionally, the connector is a connection screw.

The utility model has the advantages that:

the utility model discloses a screw drive crack mechanism that disappears makes the elastic component be in elastic state all the time through set up the elastic component in the crack nut that disappears, and when forward and reverse drive, the cooperation is all hugged closely constantly with drive screw's upper and lower subtend helicoid to drive nut and crack nut that disappears, and the movable cross beam of being convenient for realizes relapseing zero clearance motion to the problem that jack stroke precision among the screw drive process is not enough has been solved.

The utility model discloses a screw drive clearance that disappears mechanism through pressing from both sides the driving sprocket and establishing between drive nut and the clearance nut that disappears, the driving sprocket of being convenient for drives drive nut and rotates on the transmission screw to driving sprocket is convenient for realize the drive of two positive and negative directions and many drive screw's synchronous lift.

Drawings

Fig. 1 is a schematic structural view of a lead screw transmission backlash eliminating mechanism of the present invention;

fig. 2 is a schematic view of a cross-sectional structure of a transmission nut in the lead screw transmission anti-backlash mechanism of the present invention.

In the figure:

1. a drive screw; 101. a fixed end; 2. a drive nut; 201. a first shaft diameter; 202. a second axial diameter; 203. an inner cylindrical surface; 204. a threaded segment; 3. a gap eliminating nut; 4. a drive sprocket; 5. an elastic member; 6. a drive beam; 7. a self-aligning bearing; 8. a connecting member; 9. a base; 10. locking the nut; 11. adjusting the nut; 12. a gasket.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning. The term "plurality" is to be understood as more than two.

The utility model provides a lead screw transmission clearance eliminating mechanism, as shown in figure 1, which comprises a transmission lead screw 1, a transmission nut 2, a clearance eliminating nut 3, a driving chain wheel 4 and an elastic part 5, wherein the transmission lead screw 1 is provided with an external thread, and one end of the transmission lead screw 1 is a fixed end 101; the internal thread of the transmission nut 2 is matched and connected with the external thread of the transmission screw rod 1, the outer side of the transmission nut 2 is provided with a transmission beam 6, and the transmission nut 2 is connected with the transmission beam 6 through a self-aligning bearing 7; the internal thread of the anti-backlash nut 3 is matched and connected with the external thread of the transmission screw rod 1, and the anti-backlash nut 3 is far away from the fixed end 101 on the transmission screw rod 1 relative to the transmission nut 2; the driving chain wheel 4 is clamped between the transmission nut 2 and the anti-backlash nut 3; on elastic component 5 located gap nut 3 that disappears, elastic component 5, gap nut 3 that disappears, driving sprocket 4 and drive nut 2 are worn to establish in proper order and are fixed on drive nut 2 by the one end of connecting piece 8, and elastic component 5 is in elastic state all the time.

As shown in fig. 1, in the screw transmission gap eliminating mechanism provided in this embodiment, the fixed end 101 of the transmission screw 1 is fixed, and the transmission nut 2 moves in the axial direction of the transmission screw 1 by rotating the thread of the transmission nut 2 on the transmission screw 1, so as to drive the transmission cross beam 6 arranged on the transmission nut 2 to move in the axial direction. Drive nut 2 and the screw-thread fit of eliminating the clearance nut 3 with drive screw 1 simultaneously, drive sprocket 4 presss from both sides and establishes between drive nut 2 and the nut 3 that eliminates the clearance, as shown in fig. 2, the tip of drive nut 2 is equipped with first diameter of axle 201 and the tip is equipped with the screw hole, 4 covers of drive sprocket are established on this first diameter of axle 201, can be connected with the screw hole through connecting piece 8 and drive sprocket 4 presss from both sides tightly fixedly, drive sprocket 4 provides drive power, drive nut 2 and the axial displacement of eliminating the clearance nut 3 synchronous rotation in order to drive transmission crossbeam 6, and drive sprocket 4 is convenient for realize the drive of two positive and negative directions, and realize the lift of drive nut 2 and the synchronous drive transmission crossbeam 6 of eliminating the clearance nut 3 on a plurality of drive screws 1.

In the embodiment shown in fig. 1, the outer end of the anti-backlash nut 3 is provided with a blind hole along the axial direction, the elastic part 5 is arranged in the blind hole, the connecting part 8 is used for penetrating the elastic part 5 and is connected to the transmission nut 2 so as to clamp the elastic part 5 in the blind hole, the elastic part 5 is always in an elastic state, the elastic pre-tightening between the anti-backlash nut 3 and the transmission nut 2 can be realized, when the anti-backlash nut 3 and the transmission nut 2 are transmitted in the positive and negative directions, the anti-backlash nut and the transmission nut can be closely fitted with the upper and lower opposite spiral surfaces of the transmission lever 1 at any time, the movable cross beam 6 can move repeatedly without backlash, and the stroke precision of the jack is improved.

Optionally, the elastic member 5 is a disc spring. The disc spring has the advantages of large elasticity and short stroke, so that enough elastic force can be provided for the gap eliminating nut 3 and the transmission nut 2, the gap eliminating nut 3 and the transmission nut 2 can be closely matched with the upper and lower opposite spiral surfaces of the transmission lever 1 at any time when transmission is carried out in the positive and negative directions, the movable cross beam 6 can conveniently move without gap repeatedly, and the stroke precision of the jack is improved.

Optionally, the lead screw transmission anti-backlash mechanism further includes a base 9, and a fixed end 101 of the transmission lead screw 1 is fixed on the base 9.

It can be understood that fixing drive screw 1 on base 9 does benefit to the stability that keeps drive screw 1 to fix a plurality of drive screws 1 on same base, drive a transmission crossbeam 6, do benefit to and keep a plurality of drive screws 1 to the synchronous drive of transmission crossbeam 6, provide the transmission precision of transmission crossbeam 6, and then provide the stroke precision of jack.

Optionally, a through hole is formed in the base 9, the fixed end 101 of the driving screw 1 is inserted into the through hole, and two ends of the through hole are respectively provided with a locking nut 10 to fix the driving screw 1 in the through hole.

As shown in fig. 1, the fixing end 101 is inserted into the through hole, and the two locking nuts 10 are screwed on the driving screw 1 respectively and located at two sides of the base 9 for clamping and fixing the driving screw 1, preferably, because the torque received by the driving screw 1 is large, a pin or a screw is circumferentially positioned and connected between the locking nut 10 and the driving screw 1, or between the locking nut 10 and the body of the base 9, so as to prevent the driving screw 1 from rotating.

Optionally, the self-aligning bearings 7 are arranged at the upper end and the lower end of the transmission beam 6, the self-aligning bearing 7 at the upper end can be stopped against the step surface of the transmission nut 2, the self-aligning bearing 7 at the lower end is clamped and fixed through the adjusting nut 11, and the adjusting nut 11 is in fit connection with the external thread of the transmission nut 2.

As shown in fig. 1, the left and right ends respectively correspond to the upper and lower ends of the transmission screw 1, wherein the base 9 is located at the bottom end, the two ends of the transmission beam 6 in fig. 1 are respectively connected with the transmission nut 2 through a self-aligning bearing 7, so as to realize the rotational connection between the transmission beam 6 and the transmission nut 2, and when the transmission nut 2 rotates relative to the transmission screw 1, the transmission beam 6 realizes the axial movement. As shown in fig. 2, the other end of the transmission nut 2 opposite to the first shaft diameter 201 is provided with a second shaft diameter 202, and the transmission beam 6 assembled with the self-aligning bearing 7 is assembled on the second shaft diameter 202 and is stopped against the end surface of the second shaft diameter 202 through the adjusting nut 11, so that the transmission beam 6 is quickly installed and positioned. Preferably, a pin may be provided between the adjustment nut 11 and the drive nut 2 to define circumferentially, prevent relative rotation during the drive,

optionally, the screw transmission backlash elimination mechanism further includes a washer 12, and the washer 12 is disposed between the adjusting nut 11 and the self-aligning bearing 7.

As shown in fig. 1, one or more than two washers 12 may be disposed and clamped between the adjusting nut 11 and the self-aligning bearing 7 at the bottom end of the transmission beam 6, so as to facilitate the pre-tightening force adjustment of the adjusting nut 11 and have an anti-loose effect. The position of the gasket 12 can be independently arranged on one side of the transmission beam 6 to abut against the self-aligning bearing 7 on the side for limiting and fastening, and also can be arranged on two sides to adjust the axial position of the transmission beam 6 on the transmission nut 2, so that the position leveling among the plurality of transmission screws 1 is facilitated.

Optionally, the inner side walls of the upper end and the lower end of the transmission nut 2 are provided with inner cylindrical surfaces 203, and the inner cylindrical surfaces 203 are matched with the outer circle of the transmission screw 1.

As shown in fig. 2, which is a cross-sectional view of the transmission nut 2, two ends of the transmission nut 2 are provided with smooth inner cylindrical surfaces 203, and the middle section is a threaded section 204, and when the threaded section 204 is in threaded fit transmission with the transmission screw 1, the inner cylindrical surfaces 203 can always be in fit sliding with the outer circle of the transmission screw 1, so that the functions of centering and guiding are achieved.

Optionally, four transmission screw rods 1 are provided, the four transmission screw rods 1 are arranged at intervals and fixed on the same base 9, and one transmission cross beam 6 is simultaneously installed on the four transmission screw rods 1 through transmission nuts 2.

It should be explained that, four transmission screws 1 are vertically arranged on the base 9, a screw transmission gap eliminating mechanism is respectively arranged on each screw 1, and meanwhile, adjustment is realized on one transmission cross beam 6, and when four driving chain wheels 4 are driven by one driving mechanism to rotate, horizontal lifting of the transmission cross beam 6 can be realized, so that the forming precision is improved.

Optionally, the external thread on the drive screw 1 is a trapezoidal thread.

Correspondingly, the screw thread section 204 of drive nut 2 adopts trapezoidal thread, can provide required intensity of transmission and rigidity requirement, simultaneously, the utility model discloses in adopt elastic component 5 to come the pretension, realize the reliable laminating between the fitting surface for trapezoidal thread, can all have good stroke precision when reciprocating motion from top to bottom, enlarged the range of application of jack.

Optionally, the connecting member 8 is a connecting screw.

As shown in fig. 1, the connecting member 8 is a connecting screw, correspondingly, a smooth through hole is formed in the driving sprocket 4, the end portion of the transmission nut 2 is a threaded hole and is matched with the connecting screw, the end portion of the connecting member 8 sequentially penetrates through the elastic member 5, one end of the anti-backlash nut 3, the driving sprocket 4 and the transmission nut 2, and is in threaded connection with the transmission nut 2 and locked, so that the anti-backlash nut 3, the driving sprocket 4 and the transmission nut 2 are connected, and meanwhile, pre-tightening of the elastic member 5 is achieved. It can be understood that the connecting pieces 8 are arranged along the circumferential direction of the end face of the anti-backlash nut 3, and the connecting pieces 8 are arranged at intervals and uniformly to avoid eccentricity.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a lead screw drive clearance mechanism that disappears which characterized in that includes:

the transmission screw rod (1) is provided with an external thread, and one end of the transmission screw rod (1) is a fixed end (101);

the inner thread of the transmission nut (2) is matched and connected with the outer thread of the transmission lead screw (1), a transmission cross beam (6) is arranged on the outer side of the transmission nut (2), and the transmission nut (2) is connected with the transmission cross beam (6) through a self-aligning bearing (7);

the anti-backlash nut (3), the internal thread of the anti-backlash nut (3) is matched and connected with the external thread of the transmission screw rod (1), and the anti-backlash nut (3) is far away from the fixed end (101) on the transmission screw rod (1) relative to the transmission nut (2);

the driving chain wheel (4) is clamped between the transmission nut (2) and the anti-backlash nut (3);

the elastic piece (5) is arranged on the gap eliminating nut (3), one end of the connecting piece (8) penetrates through the elastic piece (5), the gap eliminating nut (3), the driving chain wheel (4) and the transmission nut (2) in sequence and is fixed on the transmission nut (2), and the elastic piece (5) is always in an elastic state.

2. A lead screw drive anti-backlash mechanism according to claim 1, wherein the elastic member (5) is a disc spring.

3. The screw drive anti-backlash mechanism according to claim 1, further comprising a base (9), wherein the fixed end (101) of the drive screw (1) is fixed to the base (9).

4. The screw drive backlash mechanism according to claim 3, wherein a through hole is formed in the base (9), the fixed end (101) of the drive screw (1) is inserted into the through hole, and lock nuts (10) are respectively arranged at two ends of the through hole to fix the drive screw (1) in the through hole.

5. The lead screw transmission gap eliminating mechanism according to claim 1, wherein the self-aligning bearings (7) are arranged at the upper end and the lower end of the transmission beam (6), the self-aligning bearings (7) at the upper end position can be stopped against the step surface of the transmission nut (2), the self-aligning bearings (7) at the lower end position are clamped and fixed through adjusting nuts (11), and the internal threads of the adjusting nuts (11) are matched and connected with the external threads of the transmission nut (2).

6. The screw drive backlash mechanism according to claim 5, further comprising a washer (12), wherein the washer (12) is arranged on the drive nut (2) in a penetrating manner and is arranged between the adjusting nut (11) and the self-aligning bearing (7).

7. The screw transmission gap eliminating mechanism according to claim 1, wherein inner cylindrical surfaces (203) are arranged on the inner side walls of the upper end and the lower end of the transmission nut (2), and the inner cylindrical surfaces (203) are matched with the outer circle of the transmission screw (1).

8. The screw transmission backlash mechanism according to claim 3, wherein four transmission screws (1) are provided, four transmission screws (1) are arranged at intervals and fixed on the same base (9), and one transmission cross beam (6) is simultaneously mounted on the four transmission screws (1) through the transmission nuts (2).

9. A lead screw drive anti-backlash mechanism according to claim 1, wherein the external thread on the drive lead screw (1) is a trapezoidal thread.

10. Screw drive anti-backlash mechanism according to claim 1, wherein the connecting piece (8) is a connecting screw.

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