CN215928283U

CN215928283U - Ball screw speed reducer

Info

Publication number: CN215928283U
Application number: CN202121305109.8U
Authority: CN
Inventors: 田达
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2022-03-01
Anticipated expiration: 2031-06-10

Abstract

The utility model discloses a ball screw speed reducer, which comprises a shell, a ball screw shaft and a ball screw, wherein the ball screw shaft and the ball screw are arranged in the shell; the device also comprises a ball double-sided thread slide block transmission mechanism; the ball double-sided thread sliding block transmission mechanism is formed by sequentially arranging and enclosing a plurality of ball double-sided thread sliding blocks end to end; the ball double-sided thread sliding block is characterized in that an output ball meshed with the left tooth surface of the ball thread wheel shaft is arranged on the right surface of the ball double-sided thread sliding block and acts on a tooth socket of the left tooth surface of the ball thread shaft, and an input ball meshed with the right tooth surface of the ball screw is arranged on the left surface of the ball double-sided thread sliding block and acts on the right tooth socket of the ball screw. The speed reducer realizes high-efficiency large-speed-ratio speed reduction, has small power volume with the same power, high material utilization rate, strong transmission power handling capacity, small accumulated error of the clearance on the side of the ruler and high transmission precision, and fully shows good general processability and strong and reasonable transmission bearing capacity, thereby expanding the speed reduction range, the application field and the like.

Description

Ball screw speed reducer

Technical Field

The utility model relates to the technical field of speed reducer power, in particular to a ball screw speed reducer.

Background

The existing large reduction ratio transmission technology uses a common multistage speed reducer and a plurality of multistage speed reducers for series transmission, and has large volume and low efficiency, so that the production cost is greatly increased, and the installation space and the maintenance cost are greatly increased.

Publication (bulletin) No.: CN103615499A, publication (public notice) day: 2014-03-05 discloses a ball-bearing worm gear pair, which uses the rolling of steel balls in spiral grooves on the outer edge of a worm and worm wheel to replace the meshing friction motion between worm screw teeth and the tooth surface of the worm wheel so as to push the worm wheel to rotate, thereby greatly improving the transmission efficiency and various technical performance indexes. The shape of the spiral groove on the worm and worm wheel in the normal section or the axial section of the worm can be a single circular arc shape, a double circular arc shape or a straight profile groove shape; the envelope mode is mainly double envelope and can also be single envelope; the steel ball circulation mode comprises worm internal circulation and worm wheel internal circulation, and the steel ball circularly flows in a guide sheet, a spiral groove, a reverse reflux device, an inner raceway and an outer protective cover of the worm and worm wheel. The ball worm gear pair is used for transmitting motion and torque between two spatially staggered shafts, the motion can be deceleration or acceleration, the most common deceleration motion with a shaft intersection angle sigma of 90 degrees is applied, and the ball worm gear pair is a transmission device widely applied in mechanical transmission.

Publication (bulletin) No.: CN101509543A, publication (public notice) day: 2009-08-19 relates to a ball screw speed reducing mechanism for angle output, which comprises a ball screw, a screw nut, a rack, a fan-shaped ball threaded wheel shaft, an output shaft, a shell and a bearing, wherein the ball screw which can rotate under the drive of a power element is connected with the shell through the bearing and drives the screw nut to reciprocate through self rotation, the inner side surface of the rack is matched with the outer side surface of the screw nut and is fixedly connected with the screw nut, the tooth part of the fan-shaped ball threaded wheel shaft is meshed with the rack, and the output shaft passes through a central hole of the fan-shaped ball threaded wheel shaft and is fixedly connected with the fan-shaped ball threaded wheel shaft. The related speed reducing mechanism is mainly used for a position servo system to realize angle output. The two-stage transmission of the ball screw and the ball thread wheel shaft rack is adopted, so that the speed reducer has the characteristics of high working efficiency, large reduction ratio, small side clearance, small volume and light weight.

Publication (bulletin) No.: CN205315617U, publication (public notice) day: 2016-06-15 discloses a ball screw worm gear reducer comprising a ball screw drive unit and a worm gear, the ball screw drive unit and the worm gear being engaged by a purely rolling transmission arrangement. The speed reducer is of a pure rolling transmission structure, has the characteristics of high speed, high precision, high efficiency and the like, and effectively overcomes the defects of low rotating speed of an input shaft, easy abrasion of a transmission part, poor output positioning precision and the like of the traditional worm and gear speed reducer.

Publication (bulletin) No.: CN1420293A, publication (public notice) day: 2003-05-28 provides a ball screw and a CVT having the ball screw, which can make the CVT lightweight and compact without lowering the transmission efficiency. In a belt type continuously variable transmission in which a transmission belt is wound between facing belt receiving surfaces of a fixed sheave and a movable sheave provided on a rotating shaft, and the movable sheave is moved in an axial direction by a ball screw, so that a winding diameter of the transmission belt is steplessly changed to perform speed change, rotation and axial movement of a nut of the ball screw are fixed, a hollow screw shaft is rotatably and axially movable, and is connected to the movable sheave, an end portion of the screw shaft opposite to the movable sheave is covered with an end portion of the nut, and the movable sheave is moved in the axial direction by rotating and driving the screw shaft.

Publication (bulletin) No.: CN112081890A, publication (public notice) day: 2020-12-15 relate to a ball worm driving gyrator, which comprises an outer ring shell, wherein the inner wall of the outer ring shell is provided with a roller groove, and a spherical indexing inner ring is arranged in the outer ring shell in a rotating fit manner; the ball-rolling mill is characterized in that a plurality of ball sockets are arranged on the circumferential surface of the spherical indexing inner ring at equal intervals, each ball socket is internally provided with a ball in a matched mode, one radial end of each ball is arranged in each ball socket, the other radial end of each ball is arranged in each roller groove, the spherical indexing inner ring is in limited connection with the outer ring shell in the axial direction through the balls, the outer ring shell is provided with ball inlet holes, and the ball inlet holes are communicated with the roller grooves. The gyrator can combine the transmission torque with the full-circle gyration motion, further has fewer combined parts, and can be effectively applied to severe application occasions such as small equipment volume, light weight, high precision, large reduction ratio, torque transmission requirement and the like.

In summary, the technical solutions of the above-disclosed technologies, the technical problems to be solved, and the advantageous effects thereof are all different from the present invention, and no technical inspiration exists in the above-disclosed technical documents for further technical features, technical problems to be solved, and advantageous effects thereof.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide the ball screw speed reducer which realizes high-efficiency large-speed-ratio speed reduction, has small power volume with the same power, high material utilization rate, strong transmission power throughput capacity, small accumulated error of the side clearance of the ruler and high transmission precision, fully shows good general processability and strong and reasonable transmission bearing capacity, and further expands the speed reduction range, the application field and the like.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a ball screw speed reducer comprises a machine shell, a ball screw shaft and a ball screw, wherein the ball screw shaft and the ball screw are arranged in the machine shell;

the device also comprises a ball double-sided thread slide block transmission mechanism;

the ball double-sided thread sliding block transmission mechanism is formed by sequentially arranging and enclosing a plurality of ball double-sided thread sliding blocks end to end;

the right surface of the ball double-sided threaded sliding block is provided with a right output ball tooth groove which is matched and corresponds to the ball threaded wheel shaft, namely the right output ball tooth groove is connected with the threaded ball tooth groove on the outer circumferential surface of the ball threaded wheel shaft through an output ball;

the left surface of the ball double-sided thread sliding block is provided with a left input ball tooth groove which is matched and corresponds to the ball screw, namely, the left input ball tooth groove is connected with the thread ball tooth groove on the outer circumferential surface of the ball screw through an input ball.

The double-sided screw thread sliding block transmission mechanism comprises a sliding block ball main guide mechanism, a sliding block ball main guide mechanism and a screw thread sliding block transmission mechanism, wherein the sliding block ball main guide mechanism is arranged in a machine shell, and is a circulating main guide groove formed in the machine shell;

the inner side surface of the ball double-sided thread slider is provided with an inner ball guide groove used for being connected with a slider ball main guide mechanism, namely, the circulating main guide groove is connected with the inner ball guide groove through a main guide ball.

The shell is provided with a double-thread sliding block, the shell is provided with an outer ball guide groove, the outer side surface of the double-thread sliding block is provided with an auxiliary guide mechanism, the outer ball guide groove is used for being connected with the auxiliary guide mechanism on the sliding block, the auxiliary guide mechanism on the sliding block is a circulating auxiliary guide groove arranged in the shell, and the circulating auxiliary guide groove is connected with the outer ball guide groove through the auxiliary guide ball.

Furthermore, two symmetrical slide block arc guide surfaces are arranged in the shell and are respectively positioned in front of and behind the slide block ball main guide mechanism, so that the slide block with the double-sided screw threads can smoothly and circularly run conveniently.

The wheel shaft ball guide mechanism is a wheel shaft ball circulation groove formed in the ball screw wheel shaft, namely two ends of the wheel shaft ball circulation groove are communicated with a screw thread ball tooth groove on the outer circumferential surface of the ball screw wheel shaft, and wheel shaft balls circulate in the screw thread ball tooth groove and the wheel shaft ball circulation groove; the axle ball is the output ball.

Further, the ball screw comprises a screw shaft and an outer sleeve which are sleeved together;

the thread ball tooth groove on the outer wall of the outer sleeve is connected with the left input ball tooth groove of the ball double-sided thread sliding block through an input ball;

and the screw shaft is provided with a screw shaft ball circulation channel for circularly operating the input balls, and two ends of the screw shaft ball circulation channel are communicated with the thread ball tooth grooves on the outer wall of the outer sleeve through outer sleeve ball communication holes formed in the outer sleeve.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model can realize the transmission ratio of dozens to thousands: 1, small volume, large torque power throughput, high efficiency, good processing manufacturability and reliable performance.

2. The main guide mechanism of the slide block ball, the auxiliary guide mechanism on the slide block ball, the wheel shaft ball guide mechanism and the slide block arc guide surface can simultaneously ensure the smooth operation of the slide block transmission mechanism with the double-sided screw threads of the ball.

3. The input and the output on two sides of the ball double-sided thread sliding block are transmitted through the balls, the power loss is greatly reduced, the operation is smoother, and the power efficiency is improved.

4. The input ball can run through the screw shaft ball circulation channel, the output ball can run through the wheel shaft ball circulation groove, and no running obstacle exists.

5. The arc guide surface of the sliding block is positioned in front and back of the main guide mechanism of the sliding block ball, so that the sliding block with the double-sided thread of the ball can smoothly and circularly run.

Drawings

Fig. 1 is a schematic structural diagram of a ball screw reducer according to the present invention.

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

FIG. 4 is a schematic view of a ball screw axle;

FIG. 5 is a schematic structural diagram of a ball double-thread slider;

FIG. 6 is a left side view of FIG. 5;

FIG. 7 is a right side view of FIG. 5;

FIG. 8 is a schematic view of a ball screw;

FIG. 9 is a schematic view showing a structure of a screw shaft of the ball screw;

fig. 10 is a cross-sectional view C-C of fig. 8.

In the figure: a housing 1; a ball screw shaft 2; a ball double-sided thread slider 3; a ball screw 4; a slider ball main guide mechanism 5; an auxiliary guide mechanism 6 is arranged on the slide block ball; a wheel axle ball guide mechanism 7; a slide block arc guide surface 8;

a left input ball spline 31; a right output ball spline 32;

outer jacket ball communication holes 41; a screw shaft ball circulation passage 42; a screw shaft 43; an outer jacket 44.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 10, the present invention provides a technical solution:

a ball screw speed reducer comprises a machine shell 1, a ball screw shaft 2 and a ball screw 4, wherein the ball screw shaft and the ball screw are arranged in the machine shell;

the ball double-sided thread sliding block transmission mechanism is formed by sequentially arranging and enclosing a plurality of ball double-sided thread sliding blocks 3 end to end; this embodiment employs 10 ball double-threaded sliders.

The right surface of the ball double-sided threaded slider is provided with a right output ball tooth groove 32 which is matched with the ball threaded wheel shaft correspondingly, namely the right output ball tooth groove is connected with the threaded ball tooth groove on the outer circumferential surface of the ball threaded wheel shaft through an output ball;

the left surface of the ball double-sided thread slider is provided with a left input ball tooth groove 31 corresponding to the ball screw in a matched manner, namely the left input ball tooth groove is connected with a thread ball tooth groove on the outer circumferential surface of the ball screw through an input ball.

The ball screw of the present embodiment is in transmission connection with the ball screw shaft through 3 ball double-sided screw sliders, and the specific number depends on the size of the ball screw shaft and the size of the ball main guide mechanism of the slider, but any modification such as size and number of components is within the protection scope of the present invention.

The double-sided screw slider transmission mechanism comprises a main slider ball guide mechanism 5, a main slider ball guide mechanism and a double-sided screw slider transmission mechanism, wherein the main slider ball guide mechanism is arranged in a machine shell and is a circulating main guide groove formed in the machine shell;

Furthermore, the auxiliary guide mechanism comprises an auxiliary guide mechanism 6 arranged on a slide ball inside the shell, an outer ball guide groove used for being connected with the auxiliary guide mechanism on the slide ball is formed in the outer side surface of the slide block with double-sided threads, and the auxiliary guide mechanism on the slide ball is a circulating auxiliary guide groove formed in the shell, namely the circulating auxiliary guide groove is connected with the outer ball guide groove through an auxiliary guide ball.

Furthermore, two symmetrical slide block arc guide surfaces 8 are arranged in the shell and are respectively positioned in front of and behind the slide block ball main guide mechanism, so that the slide block with the double-sided screw threads can smoothly and circularly run conveniently.

The wheel shaft ball guide mechanism 7 is a wheel shaft ball circulation groove formed in the ball screw wheel shaft, namely two ends of the wheel shaft ball circulation groove are communicated with a screw thread ball tooth groove on the outer circumferential surface of the ball screw wheel shaft, and wheel shaft balls circulate in the screw thread ball tooth groove and the wheel shaft ball circulation groove; the axle ball is the output ball.

Further, the ball screw comprises a screw shaft 43 and an outer sleeve 44 which are sleeved together;

and a screw shaft ball circulation channel 42 for circularly operating the input balls is formed in the screw shaft, and two ends of the screw shaft ball circulation channel are communicated with a thread ball tooth socket on the outer wall of the outer sleeve through an outer sleeve ball communication hole 41 formed in the outer sleeve.

The utility model can realize the transmission ratio of dozens to thousands: 1, small volume, large torque power throughput, high efficiency, good processing manufacturability and reliable performance.

The main guide mechanism of the slide block ball, the auxiliary guide mechanism on the slide block ball, the wheel shaft ball guide mechanism and the slide block arc guide surface can simultaneously ensure the smooth operation of the slide block transmission mechanism with the double-sided screw threads of the ball.

The input and the output on two sides of the ball double-sided thread sliding block are transmitted through the balls, the power loss is greatly reduced, the operation is smoother, and the power efficiency is improved.

The input ball can run through the screw shaft ball circulation channel, the output ball can run through the wheel shaft ball circulation groove, and no running obstacle exists.

The arc guide surface of the sliding block is positioned in front and back of the main guide mechanism of the sliding block ball, so that the sliding block with the double-sided thread of the ball can smoothly and circularly run.

The speed reducer is based on high mechanical efficiency of ball rolling, and the whole power transmission chain is in ball transmission.

The power transmission is realized by that a screw shaft rotates through an external thread sleeve which is connected with a fastener into a whole, so that an input ball between an external thread sleeve tooth space and a double-sided thread sliding block is driven to move, the double-sided thread sliding block is guided to move linearly by a sliding block ball main guide mechanism and a sliding block ball auxiliary guide mechanism, meanwhile, an output ball between the right-side thread tooth space of the moving double-sided thread sliding block and the left side of a ball thread wheel shaft is driven to move, and the output ball drives the ball thread wheel shaft to rotate under a shell structure, so that double-stage wedge surface rolling friction speed reduction and boosting transmission is realized. Conversely, the torque transmission is reduced for increasing speed.

The input ball is circularly operated in the tooth groove of the external thread sleeve and forms circular motion with the groove on the surface of the ball screw; the output ball forms a motion circulation path between the tooth space of the ball screw wheel shaft and the shell and the tooth space of the left screw of the double-sided slider, so that when the output ball is meshed with the double-sided slider, each row on each ball screw wheel shaft performs self-circulation, when the output ball is rotated into a non-meshing area, the output ball is circulated to the meshing area by the ball screw wheel shaft to continue to work, and the output ball runs smoothly in cycles.

The utility model is beneficial to the direct connection of the motor and the speed reducer, overcomes the defects of low efficiency and high temperature of the traditional secondary enveloping sliding friction, ensures that each ball bears the same stress state during working, and realizes the reasonable application of ball screw transmission in the aspect of the speed reducer. The speed reducer realizes high-efficiency large-speed-ratio speed reduction, has small power volume with the same power, high material utilization rate, strong transmission power handling capacity, small accumulated error of the clearance on the side of the ruler and high transmission precision, and fully shows good general processability and strong and reasonable transmission bearing capacity, thereby expanding the speed reduction range, the application field and the like.

All parts and parts which are not discussed in the present application and the connection mode of all parts and parts in the present application belong to the known technology in the technical field, and are not described again. Such as welding, threaded connections, etc.

In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A ball screw speed reducer comprises a machine shell, a ball screw shaft and a ball screw, wherein the ball screw shaft and the ball screw are arranged in the machine shell;

it is characterized by also comprising a ball double-sided thread slide block transmission mechanism;

the right surface of the ball double-sided threaded slider is provided with a right meshing ball tooth groove which is matched and corresponds to the ball threaded wheel shaft, namely the right meshing output ball tooth groove is connected with the threaded ball meshing tooth groove on the outer circumferential surface of the ball threaded wheel shaft through a circulating shared output ball;

the left surface of the ball double-sided thread sliding block is provided with a left meshing input ball tooth groove which is matched and corresponds to the ball screw, namely the left meshing input ball tooth groove is connected with the thread ball meshing tooth groove on the outer circumferential surface of the ball screw through a circulating common input ball.

2. The ball screw reducer according to claim 1, further comprising a slider ball main guide mechanism disposed inside the housing, wherein the slider ball main guide mechanism is a circulating main guide groove formed inside the housing, and the ball double-sided screw slider transmission mechanism surrounds the outside of the slider ball main guide mechanism;

3. The ball screw reducer according to claim 2, further comprising an auxiliary guide mechanism on the slider ball disposed inside the housing, wherein an outer ball guide groove for connecting with the auxiliary guide mechanism on the slider ball is formed on an outer side surface of the slider with double-sided screw threads, and the auxiliary guide mechanism on the slider ball is a circulation auxiliary guide groove formed inside the housing, i.e., the circulation auxiliary guide groove is connected with the outer ball guide groove through an auxiliary guide ball.

4. The ball screw reducer according to claim 2 or 3, wherein two symmetrical arc guide surfaces of the slider are formed in the housing and are respectively positioned in front and rear of the ball main guide mechanism of the slider, so that the ball double-sided threaded slider can smoothly and circularly run.

5. The ball screw reducer according to claim 1, 2 or 3, further comprising an axle ball guide mechanism, wherein the axle ball guide mechanism is an axle ball circulation groove formed in the ball screw axle, that is, both ends of the axle ball circulation groove communicate with the threaded ball spline on the outer circumferential surface of the ball screw axle, and the axle ball circulates in the threaded ball spline and the axle ball circulation groove; the axle ball is the output ball.

6. The ball screw reducer according to claim 1, 2 or 3, wherein the ball screw comprises a screw shaft and an outer sleeve which are sleeved together;