阅读说明：本技术 一种输出直线和旋转运动的单驱动蜗轮丝杠装置 (Single-drive worm screw device for outputting linear and rotary motion ) 是由 陈平 翁江铭 高攀 常壮壮 冷肃 于 2021-01-05 设计创作，主要内容包括：本发明公开了一种输出直线和旋转运动的单驱动蜗轮丝杠装置,包括底座,该底座上安装有丝杠螺母机构,其中丝杠螺母通过球轴承转动安装在底座上,丝杠螺母连接有动力输入机构,丝杠一端为复位端,复位端外罩设有套筒,该套筒与底座固定连接,该套筒与丝杠复位端之间设有直线导向机构,套筒靠近丝杠螺母的内端设有内棘轮组件,该内棘轮组件与丝杠复位端之间形成内棘轮机构,其允许丝杠沿着进给方向单向转动,当丝杠被反向驱动时,内棘轮机构阻挡其反向转动,从而使丝杠做复位直线运动。本发明的有益效果：能够实现单个动力输入下直线运动和旋转运动的输出,动力输入反向时丝杠又能自动复位,整个装置结构简单、紧凑、便于自动控制。(The invention discloses a single-drive worm screw device for outputting linear and rotary motion, which comprises a base, wherein a screw nut mechanism is arranged on the base, the screw nut is rotatably arranged on the base through a ball bearing, the screw nut is connected with a power input mechanism, one end of a screw is a reset end, a sleeve is arranged outside the reset end, the sleeve is fixedly connected with the base, a linear guide mechanism is arranged between the sleeve and the reset end of the screw, an inner ratchet wheel component is arranged at the inner end of the sleeve, which is close to the screw nut, an inner ratchet wheel mechanism is formed between the inner ratchet wheel component and the reset end of the screw, the inner ratchet wheel mechanism allows the screw to rotate along the feeding direction in a single direction, and when the screw is driven in a reverse direction, the inner ratchet wheel mechanism blocks the reverse. The invention has the beneficial effects that: the output of linear motion and rotary motion under single power input can be realized, the screw rod can automatically reset when the power input is reversed, and the whole device has a simple and compact structure and is convenient for automatic control.)

1. The utility model provides an output straight line and rotary motion's single drive worm screw device, includes base (1), installs lead screw nut mechanism on this base (1), and this lead screw nut mechanism includes engaged with lead screw nut (2) and lead screw (3), lead screw nut (2) rotate through ball bearing (4) install on base (1), its characterized in that:

the screw rod nut (2) is connected with a power input mechanism;

one end of the screw rod (3) is an output end, the other end of the screw rod is a reset end, the reset end extends out of the screw rod nut (2), a sleeve (5) is arranged outside the reset end, the sleeve (5) is fixedly connected with the base (1), the tube axis of the sleeve (5) is superposed with the central line of the screw rod (3), and a linear guide mechanism is arranged between the sleeve (5) and the reset end and guides the screw rod (3) to slide along the axial direction of the screw rod;

an inner ratchet wheel assembly is arranged at the inner end, close to the screw nut (2), of the sleeve (5), when the reset end is close to the inner ratchet wheel assembly, the linear guide mechanism is separated, an inner ratchet wheel mechanism is formed between the reset end and the inner ratchet wheel assembly, and the inner ratchet wheel mechanism allows the screw (3) to rotate in a single direction along the feeding direction of the screw under the driving of the power input mechanism;

when the power input of the power input mechanism is reversed, the inner ratchet mechanism blocks the screw rod (3) to rotate reversely, and when the screw rod (3) is positioned at a rotation stop position, the linear guide mechanism is matched again, so that the power input mechanism drives the screw rod (3) to do reset linear motion.

2. The single drive worm screw apparatus for outputting both linear and rotary motion of claim 1, wherein: the reset end is fixedly connected with a screw rod bottom plate (7), and the screw rod bottom plate (7) is positioned in the sleeve (5);

a guide sliding groove (5a) is formed in the inner wall of the sleeve (5), the guide sliding groove (5a) is arranged in parallel to the axial direction of the lead screw (3), a guide sliding block (7a) is integrally formed at the edge of the lead screw bottom plate (7), and the guide sliding block (7a) is arranged in the guide sliding groove (5a) in a sliding manner, so that the linear guide mechanism is formed;

when the power input of the power input mechanism is reversed, the inner ratchet mechanism blocks the screw rod bottom plate (7) to rotate reversely, and when the screw rod bottom plate (7) is located at a rotation stop position, the guide sliding block (7a) is over against the end part of the guide sliding groove (5a), and the guide sliding groove (5a) corresponds to an opening at the end part of the inner ratchet mechanism so as to allow the guide sliding block (7a) to slide into the guide sliding groove (5 a).

3. The single drive worm screw apparatus for outputting both linear and rotary motion of claim 2, wherein: the screw base plate (7) is a circular plate, one side surface of the screw base plate (7) abuts against and is fixedly connected with the reset end of the screw (3), and at least two guide sliding blocks (7a) are circumferentially and uniformly distributed on the edge of the screw base plate (7);

at least two guide sliding grooves (5a) are circumferentially and uniformly distributed on the inner wall of the sleeve (5), and the guide sliding grooves (5a) correspond to the guide sliding blocks (7a) one by one;

and a sealing cover (6) is buckled and covered on the end surface of the sleeve (5) far away from the screw nut (2).

4. A single drive worm screw device outputting both linear and rotary motion as claimed in claim 3, wherein: the base (1) is further provided with a rotary table bearing (11), the rotary table bearing (11) is sleeved outside the lead screw (3), and one end face of the rotary table bearing (11) faces towards the inner hole of the sleeve (5) and is parallel to and right opposite to the lead screw bottom plate (7).

5. A single drive worm screw device outputting both linear and rotary motion as claimed in claim 3, wherein: the inner ratchet wheel assembly comprises a reverse rotation prevention ring (8), a ratchet wheel stop block (9) and a stop block reset pressure spring (10), the reverse rotation prevention ring (8) is arranged on the inner wall of the sleeve (5), and the inner wall of the reverse rotation prevention ring (8) is not higher than the groove bottom of the guide sliding groove (5 a);

a stop block accommodating notch penetrates through the anti-reverse ring (8), the ratchet stop block (9) is arranged in the stop block accommodating notch, the ratchet stop block (9) is arc-shaped, the ratchet stop block (9) is arranged along the extending direction of the anti-reverse ring (8), one end of the ratchet stop block is hinged to the anti-reverse ring (8), the other end of the ratchet stop block is a movable end, the extending direction from the hinged end to the movable end of the ratchet stop block (9) is the same as the feeding rotating direction of the lead screw (3), the movable end is forked to form a limiting bayonet, the edge of the stop block accommodating notch is connected with a limiting block, and the limiting block extends into the limiting bayonet;

the movable end corresponds to an end opening of the guide chute (5 a);

ratchet dog (9) lateral surface with be equipped with the rotation chamber of stepping down between sleeve (5), should rotate and step down the intracavity and be equipped with dog pressure spring (10) that resets, the one end of this dog pressure spring (10) that resets is supported and is leaned on sleeve (5), the other end supports and leans on the lateral surface of ratchet dog (9).

6. The single drive worm screw apparatus for outputting both linear and rotary motion of claim 4, wherein: the base (1) is provided with an internal cavity, a pair of parallel walls of the base (1) are respectively provided with a mounting hole, the base (1) is internally provided with the lead screw nut (2), two ends of the lead screw nut (2) are respectively over against the corresponding mounting holes, and a ball bearing (4) is arranged between two ends of the lead screw nut (2) and the inner wall of the base (1) where the mounting holes are located;

the two ends of the lead screw (3) extend out of the corresponding mounting holes respectively, the outer wall of the base (1) close to the reset end of the lead screw (3) is connected with the sleeve (5), and the base (1) faces the outer wall of the inner cavity of the sleeve (5) and is further provided with the turntable bearing (11).

7. The single drive worm screw apparatus for outputting both linear and rotary motion of claim 6, wherein: the power input mechanism is a worm gear mechanism and comprises a worm wheel and an input worm (12);

the outer wall of the screw nut (2) is fixedly sleeved with the worm wheel, the worm wheel is meshed with the input worm (12), and two ends of the input worm (12) are respectively installed on the base (1) through bearings.

8. The single drive worm screw apparatus for outputting both linear and rotary motion of claim 7, wherein: the base (1) is also provided with an oil hole which communicates the inner cavity of the base (1) with the outside, and an oil plug (1a) is arranged in the oil hole.

Technical Field

The invention belongs to the technical field of mechanical transmission, relates to a worm gear screw rod device capable of realizing compound motion, and particularly relates to a single-drive worm gear screw rod device capable of outputting linear and rotary motion.

Background

The screw nut mechanism is also called a screw transmission mechanism, is widely applied to the fields of jacking devices, linear driving and the like, and comprises a feed screw which mainly transmits motion, such as a machine tool workbench, a screw transmission mechanism which adjusts the relative position between parts and the like. The screw rod lifter is divided into a sliding friction mechanism and a rolling friction mechanism. The sliding lead screw nut mechanism has the advantages of simple structure, convenient processing, low manufacturing cost, self-locking function, large friction resistance moment and low transmission efficiency. Although the ball screw nut mechanism has the advantages of complex structure, high manufacturing cost and no self-locking, the ball screw nut mechanism has the advantages of small friction resistance moment, high transmission efficiency, high precision, good system rigidity, reversibility of movement and long service life. The screw motor is designed based on a screw nut mechanism, the existing screw motor can only realize linear motion output or rotary motion output, and in the case of some working conditions requiring compound motion, the screw motor can only adopt a multi-degree-of-freedom control mode of serial double drive or more drive by adopting a screw mechanism with two motion modes. This not only greatly increases the size of the device, but also increases the difficulty of control.

Disclosure of Invention

In view of the above, the present invention provides a single drive worm screw device that outputs both linear and rotational motion.

The technical scheme is as follows:

a single-drive worm screw device for outputting linear and rotary motion comprises a base, a screw nut mechanism is arranged on the base, the screw nut mechanism comprises a screw nut and a screw which are meshed with each other, the screw nut is rotationally arranged on the base through a ball bearing, and the key point is that,

the screw nut is connected with a power input mechanism;

one end of the screw rod is an output end, the other end of the screw rod is a reset end, the reset end extends out of the screw rod nut, a sleeve is arranged outside the reset end and fixedly connected with the base, a cylinder center line of the sleeve is overlapped with a center line of the screw rod, and a linear guide mechanism is arranged between the sleeve and the reset end and guides the screw rod to slide along the axial direction of the screw rod;

an inner ratchet wheel assembly is arranged at the inner end, close to the screw nut, of the sleeve, when the reset end is close to the inner ratchet wheel assembly, the linear guide mechanism is separated, an inner ratchet wheel mechanism is formed between the reset end and the inner ratchet wheel assembly, and the inner ratchet wheel mechanism allows the screw to rotate in a single direction along the feeding direction of the screw under the driving of the power input mechanism;

when the power input of the power input mechanism is reversed, the inner ratchet mechanism blocks the screw rod from reversely rotating, and when the screw rod is positioned at a rotation stop position, the linear guide mechanism is matched again, so that the power input mechanism drives the screw rod to do reset linear motion.

By adopting the design, the reset end of the screw is positioned at one end of the sleeve, which is far away from the base, in the initial state, the power input mechanism drives the screw nut to rotate, the screw nut drives the screw, and the screw cannot slide and only can slide relative to the sleeve, so that the screw outputs linear motion; when the power input of the power input mechanism is reversed, the guide slide block automatically slides into the guide sliding groove when the lead screw is blocked by the ratchet wheel component and does not rotate any more, and the lead screw nut drives the lead screw to reset.

As a preferred technical scheme, the reset end is fixedly connected with a screw bottom plate, and the screw bottom plate is positioned in the sleeve;

the inner wall of the sleeve is provided with a guide sliding chute which is arranged in parallel to the axial direction of the screw rod, the edge of the screw rod bottom plate is integrally formed with a guide sliding block, and the guide sliding block is arranged in the guide sliding chute in a sliding manner, so that the linear guide mechanism is formed;

when the power input of the power input mechanism is reversed, the inner ratchet mechanism blocks the screw rod bottom plate to rotate reversely, and when the screw rod bottom plate is positioned at a rotation stop position, the guide sliding block is over against the end part of the guide sliding groove, and the guide sliding groove corresponds to the end part opening of the inner ratchet assembly so as to allow the guide sliding block to slide into the guide sliding groove.

By adopting the design, the structure is simple, the guide sliding block is switched between the matching with the guide sliding groove and the matching with the inner ratchet wheel assembly, and the switching of linear output and rotary motion output is realized.

As a preferred technical scheme, the screw base plate is a circular plate, one side surface of the screw base plate abuts against and is fixedly connected with a reset end of the screw, and at least two guide sliding blocks are circumferentially and uniformly distributed on the edge of the screw base plate;

at least two guide sliding grooves are circumferentially and uniformly distributed on the inner wall of the sleeve, and the guide sliding grooves correspond to the guide sliding blocks one to one;

and a sealing cover is buckled and covered on the end surface of the sleeve far away from the screw nut.

Design more than adopting, a plurality of direction sliders and direction spout cooperation help the lead screw to be stable when linear motion keeps, and sleeve tip sets up the closing cap, plays limiting displacement to the lead screw rectilinear motion that resets.

As a preferred technical scheme, the base is further provided with a rotary table bearing, the rotary table bearing is sleeved outside the screw rod, and one end face of the rotary table bearing faces the inner hole of the sleeve and is opposite to the screw rod bottom plate in parallel.

By adopting the design, when the screw rod is fed to the maximum stroke, the screw rod bottom plate is abutted against the turntable bearing, and the damage caused by overlarge friction force is prevented.

As a preferred technical scheme, the inner ratchet wheel assembly comprises a reverse rotation prevention ring, a ratchet wheel stop block and a stop block reset pressure spring, wherein the reverse rotation prevention ring is arranged on the inner wall of the sleeve, and the inner wall of the reverse rotation prevention ring is not higher than the bottom of the guide sliding groove;

a stop block accommodating notch penetrates through the anti-reverse ring, the ratchet stop block is arranged in the stop block accommodating notch, the ratchet stop block is arc-shaped, the ratchet stop block is arranged along the extension direction of the anti-reverse ring, one end of the ratchet stop block is hinged with the anti-reverse ring, the other end of the ratchet stop block is a movable end, the extension direction from the hinged end to the movable end of the ratchet stop block is the same as the feed rotation direction of the lead screw, the movable end is forked to form a limit bayonet, the edge of the stop block accommodating notch is connected with a limit block, and the limit block extends into the limit bayonet;

the movable end corresponds to an end opening of the guide chute;

ratchet dog lateral surface with be equipped with the rotation chamber of stepping down between the sleeve, should rotate and be equipped with in the chamber of stepping down the dog pressure spring that resets, the one end of this dog pressure spring that resets is supported and is leaned on the sleeve, and the other end supports and leans on the lateral surface of ratchet dog.

By adopting the design, when the screw rod rotates along the feeding direction, the screw rod bottom plate synchronously rotates and the guide slide block outwards presses the ratchet wheel stop block, and the ratchet wheel mechanism does not influence the rotation of the screw rod; when the screw rod rotates reversely, the screw rod bottom plate rotates to the end face, close to the movable end of the ratchet stop block, of the guide sliding block, the ratchet stop block blocks the guide sliding block, the screw rod nut continues to rotate to enable the guide sliding block to enter the guide sliding groove, and the screw rod moves linearly in a resetting mode to complete resetting.

As a preferred technical scheme, the base is provided with an internal cavity, a pair of parallel walls of the base are respectively provided with a mounting hole, the base is internally provided with the lead screw nut, two ends of the lead screw nut are respectively opposite to the corresponding mounting holes, and a ball bearing is arranged between two ends of the lead screw nut and the inner wall of the base where the mounting holes are located;

the two ends of the lead screw respectively extend out of the corresponding mounting holes, the outer wall of the base close to the reset end of the lead screw is connected with the sleeve, and the outer wall of the base, which faces the inner cavity of the sleeve, is provided with the turntable bearing.

By adopting the design, the stable installation of the screw and nut mechanism is facilitated, and the base plays a role in protecting the screw and nut mechanism.

As a preferred technical scheme, the power input mechanism is a worm gear mechanism, and comprises a worm gear and an input worm;

the outer wall of the screw nut is fixedly sleeved with the worm wheel, the worm wheel is meshed with the input worm, and two ends of the input worm are respectively installed on the base through bearings.

By adopting the design, the worm gear mechanism and the screw nut mechanism are integrated, the structure is compact, and the input and output response speed is high.

As the preferred technical scheme, the base is further provided with an oil hole, the inner cavity of the base is communicated with the outside through the oil hole, and an oil plug is arranged in the oil hole.

By adopting the design, lubricating oil can be conveniently added and replaced to the inner cavity of the base through the oil hole, and the worm gear mechanism and the screw nut mechanism are lubricated.

Compared with the prior art, the invention has the beneficial effects that: the single power input mechanism drives the screw nut mechanism, so that the screw outputs linear motion, and the linear stroke outputs rotary motion, thereby realizing the output of two motions under single power input, and the screw can automatically reset when the power input is reversed.

Drawings

FIG. 1 is a schematic diagram of a first perspective of the present invention;

FIG. 2 is a schematic diagram of a second perspective of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a right side view of FIG. 2;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

fig. 6 is a schematic diagram of the transmission fit of the worm gear mechanism and the lead screw nut mechanism.

Detailed Description

The present invention will be further described with reference to the following examples and the accompanying drawings.

As shown in fig. 1 to 3, the single-drive worm screw device for outputting linear and rotational motion comprises a base 1, wherein a screw nut mechanism is mounted on the base 1, the screw nut mechanism comprises a screw nut 2 and a screw 3 which are meshed with each other, the screw nut 2 is mounted on the base 1 through a ball bearing 4, the screw 3 is arranged in the screw nut 2 in a penetrating manner, the screw nut 2 is connected with a power input mechanism, one end of the screw 3 is an output end, and the other end of the screw is a reset end.

Specifically, the base 1 is provided with an internal cavity, a pair of parallel walls of the base 1 are respectively provided with a mounting hole, the base 1 is internally provided with the lead screw nut 2, two ends of the lead screw nut 2 are respectively opposite to the corresponding mounting holes, and a ball bearing 4 is arranged between two ends of the lead screw nut 2 and the inner wall of the base 1 where the mounting holes are located. The two ends of the lead screw 3 respectively extend out of the corresponding mounting holes, the outer wall of the base 1, close to the reset end of the lead screw 3, where the mounting holes are located is fixedly connected with a sleeve 5, and the tube center line of the sleeve 5 coincides with the center line of the lead screw 3. And a sealing cover 6 is buckled and covered on the end surface of the sleeve 5 far away from the screw nut 2.

The end that resets of lead screw 3 is located sleeve 5, and the end fixedly connected with lead screw bottom plate 7 that resets of lead screw 3, this lead screw bottom plate 7 also is located sleeve 5. The screw bottom plate 7 is a circular plate and is arranged with the screw 3 in a concentric line. One side surface of the screw base plate 7 abuts against and is fixedly connected with the reset end of the screw 3.

As shown in fig. 3 to 6, at least two guide sliding grooves 5a are uniformly distributed in the circumferential direction of the inner wall of the sleeve 5, the guide sliding grooves 5a are parallel to the axial direction of the screw rod 3, at least two guide sliding blocks 7a are integrally formed at the edge of the screw rod bottom plate 7, the guide sliding blocks 7a are uniformly distributed along the circumferential direction of the screw rod bottom plate 7, and the guide sliding blocks 7a are in one-to-one correspondence with the guide sliding grooves 5a and are slidably arranged in the guide sliding grooves 5a to form a linear guide mechanism.

As shown in fig. 5, the inner end of the sleeve 5 near the lead screw nut 2 is provided with an inner ratchet assembly, which forms an inner ratchet mechanism with the guide slider 7a, and the inner ratchet mechanism allows the lead screw 3 to rotate in one direction along the feeding direction under the driving of the power input mechanism.

When the power input of the power input mechanism is reversed, the inner ratchet mechanism blocks the screw base plate 7 from reversely rotating, and when the screw base plate 7 is at a rotation stop position, the guide sliding block 7a is over against the end part of one of the guide sliding grooves 5a, and the guide sliding groove 5a corresponds to an end opening of the inner ratchet assembly to allow the guide sliding block 7a to slide into the guide sliding groove 5a, so that the screw 3 is reset to linearly move.

Specifically, as shown in fig. 5, the inner ratchet assembly includes an anti-reverse rotation ring 8, a ratchet stop 9 and a stop return compression spring 10, the anti-reverse rotation ring 8 is disposed on the inner wall of the sleeve 5, and the inner wall of the anti-reverse rotation ring 8 is not higher than the groove bottom of the guide sliding groove 5 a.

Prevent running through on the reversing ring 8 and having the dog hold the breach, this dog holds to be equipped with ratchet dog 9, ratchet dog 9 is arc strip, ratchet dog 9 along prevent reversing ring 8's extending direction setting, its one end with prevent reversing ring 8 articulated, the other end is the expansion end, ratchet dog 9's hinged end to the expansion end extending direction with lead screw 3's feeding rotation direction syntropy, the expansion end branching is in order to form spacing bayonet socket, the dog holds the breach edge and is connected with the stopper, and this stopper stretches into in the spacing bayonet socket. The end face of the movable end is flush with the groove wall on one side of the guide sliding groove 5a, and the end opening of the guide sliding groove 5a is not shielded.

The sleeve 5 is propped against the inner wall of the end part of the base 1 and is provided with a ring groove, and an anti-reverse ring 8 is arranged in the ring groove. The annular tank bottom corresponds ratchet dog 9 and has been seted up and has rotated the chamber of stepping down, should rotate and is equipped with dog pressure spring 10 that resets in the intracavity of stepping down, and one end of this dog pressure spring 10 that resets is supported and is leaned on sleeve 5, the other end supports and leans on ratchet dog 9's lateral surface.

As shown in fig. 3, a turntable bearing 11 is further disposed on an outer wall of the base 1 facing the inner cavity of the sleeve 5, the turntable bearing 11 is sleeved outside the lead screw 3, and an end surface of the turntable bearing 11 faces the inner hole of the sleeve 5 and is parallel to and opposite to the lead screw bottom plate 7.

As shown in fig. 3 and 6, the power input mechanism is a bidirectional worm gear mechanism including a worm wheel and an input worm 12. And the outer wall of the screw nut 2 is processed with meshing teeth to form a worm wheel, the worm wheel is meshed with the input worm 12, and two ends of the input worm 12 are respectively installed on the base 1 through bearings.

The inner cavity of the base 1 is filled with lubricating oil to lubricate the worm gear mechanism and the screw nut mechanism. The base 1 is also provided with an oil hole which communicates the inner cavity of the base 1 with the outside, and an oil plug 1a is arranged in the oil hole, so that lubricating oil can be conveniently filled and replaced.

The principle of the device is as follows: in an initial state, the lead screw bottom plate 7 is positioned at one end, far away from the base 1, of the sleeve, the power input mechanism drives the lead screw nut 2 to rotate, the lead screw nut 2 drives the lead screw 3, and the lead screw bottom plate 7 can only slide relative to the sleeve 5 because the lead screw bottom plate 7 cannot slide, so that the lead screw 3 outputs linear motion, and when the lead screw bottom plate 7 moves to the inner ratchet wheel assembly, the lead screw bottom plate is not restrained by the guide chute 5a and can rotate, so that the lead screw bottom plate and the lead screw nut 2 synchronously rotate and output; when the power input of the power input mechanism is reversed, the screw rod 3 rotates reversely, when the screw rod bottom plate 7 is blocked by the ratchet wheel assembly and does not rotate any more, the guide sliding block 7a automatically slides into the guide sliding groove 5a, and the screw rod nut 2 drives the screw rod 3 to reset. The device can output linear motion and rotary motion.

Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.