CN207518427U - A kind of linear actuators - Google Patents

Abstract

The utility model discloses a kind of linear actuators, belong to Linear transmission technical field, including motor, geared worm, transmission worm gear, screw and transmission nut, motor driving geared worm rotation, transmission worm gear drive screw rotation, engaged transmission between geared worm and transmission worm gear, the linear actuators includes gear-box, both the transmission worm gear and screw are separately set, and the transmission worm gear coordinates with gear-box rotation connection, the screw and transmission worm gear axial direction releasable connection.The utility model has the advantage of the machining accuracies effectively reduced to screw, reduce cost.

Description

A kind of linear actuators

【Technical field】

The utility model is related to a kind of linear actuators, belong to Linear transmission technical field.

【Background technology】

Linear actuators, main operational principle are screw to be driven to rotate by motor, and transmission nut, silk are set on screw Transmission nut is driven to move back and forth when bar rotates, and generally use worm gear mechanism is driven to realize between motor and screw, In existing linear actuators, screw is typically integral structure with transmission worm gear or is fixedly connected, this structure there is also Certain drawback, due to transmission worm gear be it is intermeshing with geared worm, if transmission worm gear and screw be integral structure or Person is fixedly connected, then requires screw that should meet own rotation in assembling, ensure nibbling for transmission worm gear and geared worm again Closing precision will get well, it is clear that this higher requirement proposed to the machining accuracy of screw in itself, cost are higher.

【Utility model content】

It is provided the technical problem to be solved by the utility model is to overcome the deficiencies in the prior art a kind of linear activated Device effectively reduces the machining accuracy to screw, reduces cost.

Above-mentioned technical problem is solved, the utility model adopts the following technical solution：

A kind of linear actuators, including motor, geared worm, transmission worm gear, screw and transmission nut, motor driving transmission Worm screw rotates, and transmission worm gear drives screw rotation, engaged transmission, the linear actuators packet between geared worm and transmission worm gear Gear-box is included, both the transmission worm gear and screw are separately set, and the transmission worm gear coordinates with gear-box rotation connection, described Screw and transmission worm gear axial direction releasable connection.

Using the beneficial effects of the utility model：

First, transmission worm gear and screw are subjected to independent design, the required precision of screw can be reduced, because only needing to protect Card screw is consistent with transmission worm gear in concentricity, and precision in the axial direction then requires relative reduction, so as to Processing cost is reduced, reduces influence of the geometric tolerance of screw to transmission worm gear, geared worm meshing quality.

Meanwhile some vibrations of screw in rotation process are shaken and will not be directly delivered in transmission worm gear, it also can one Determine to reduce the influence to transmission worm gear, geared worm meshing quality in degree, reduce noise.

Preferably, being convexly equipped with pillar in the gear-box, the pillar is tightened equipped with clutch shaft bearing, the transmission worm gear It is sleeved on clutch shaft bearing.

Preferably, being recessed cotter way on the end face of the transmission worm gear, lateral pin is radially equipped on the screw, The lateral pin is fitted in the cotter way.

Preferably, the blocking that is provided at both ends with the blocking lateral pin both ends is detached from of the transmission worm gear in the cotter way Wall.

Preferably, the transmission worm gear is equipped with spline, the end of the screw is equipped with to be coordinated with the spline Spline.

Preferably, the linear actuators includes outer tube, the both ends of the outer tube are equipped with what is coordinated with the screw Second bearing and 3rd bearing.

Preferably, the motor includes output shaft, both the output shaft and geared worm are separately set, the output Shaft coupling is equipped between axis and geared worm.

Preferably, the linear actuators further includes outer tube, the transmission nut axial movement is on the outer tube, institute It states and outer groove is offered on outer tube wall, the outer groove is extended in the transmission nut part.

Other features and advantages of the utility model will be detailed in following specific embodiment, attached drawing exposure.

【Description of the drawings】

The utility model is described further below in conjunction with the accompanying drawings：

Fig. 1 is the decomposition diagram of the utility model linear actuator embodiment one；

Fig. 2 is the overall schematic of the utility model linear actuator embodiment one；

Fig. 3 is the structure diagram of holdback in the utility model linear actuator embodiment one；

Fig. 4 is the schematic cross-sectional view one in the utility model linear actuator embodiment one；

Fig. 5 be Fig. 4 in A-A to schematic cross-sectional view；

Fig. 6 is the schematic cross-sectional view two of the utility model linear actuator embodiment one；

Fig. 7 is the assembling schematic diagram of one middle gear case of the utility model linear actuator embodiment and transmission worm gear.

【Specific embodiment】

The technical solution of the utility model embodiment is explained with reference to the attached drawing of the utility model embodiment and Illustrate, but following embodiments are only the preferred embodiment of the utility model, and not all.Based on the embodiment in embodiment, Those skilled in the art obtain other embodiment under the premise of creative work is not made, and belong to the utility model Protection domain.

In the following description, occur the indicating positions such as term " interior ", " outer ", " on ", " under ", "left", "right" or Position relationship is based on orientation shown in the drawings or position relationship, and description embodiment merely for convenience is described with simplified, and It is not instruction or implies signified device or element there must be specific orientation, with specific azimuth configuration and operation, because This is it is not intended that limitation to the utility model.

Embodiment 1：

As shown in Figures 1 to 7, a kind of linear actuators of the present embodiment displaying including motor 1, geared worm 2, passes Dynamic worm gear 3, screw 4 and transmission nut 5, the rotation driving geared worm 2 of motor 1 rotate, and geared worm 2 is and 3 phase of transmission worm gear Engagement, geared worm 2 rotates, and transmission worm gear 3 is driven to rotate, and transmission worm gear 3 rotates, and screw 4 is driven to rotate, on screw 4 It is connected with transmission nut 5, during 4 own rotation of screw, transmission nut 5 is then relatively moved along the axial direction of screw 4, so as to will be electric The convert rotational motion of machine 1 is the straight reciprocating motion of transmission nut 5, and transmission nut 5 then can be used for connecting other component, use It is moved, such as same table, medical bed etc. in pushing associated components.

In the utility model, the output shaft 11 of motor 1 and geared worm 2 are subjected to split design, i.e., geared worm 2 with it is defeated Shaft 11 is not integral structure, and centre can be driven for example, by components such as shaft couplings, the output shaft 11 of such motor 1 Vibration will not be directly delivered on geared worm 2, so as to not interfere with the meshing quality of geared worm 2 and transmission worm gear 3, transmission Meshing quality improves between worm screw 2 and transmission worm gear 3, and the noise of transmission is also correspondingly reduced, and transmission efficiency also has promotion；

In addition, being sequentially connected by holdback 6 between geared worm 2 and output shaft 11, the effect of holdback 6 are When forward direction is driven, almost it is driven without abrasion, and during reverse drive, larger damping force can be generated, holdback 6 is used in In the utility model, resistance is not had when can realize and power being transmitted to geared worm 2 from output shaft 11, it is ensured that linear Actuator normal operation, but once encounter under power-off or fault condition, if inverted running occurs, i.e., from geared worm 2 When transferring power to output shaft 11, holdback 6 can generate larger resistance.The counter motion is prevented, it is linear activated so as to improve The self-lock ability of device.It should be noted that positive transmission mentioned here and reverse drive, do not imply that rotation direction, but Refer to transmission direction, i.e. motor 1 is driven geared worm 2 and is driven to be positive, and 2 driving motor 1 of geared worm is reverse drive.

Concrete structure：

With reference to shown in Fig. 3 to Fig. 5, holdback 6 described in the present embodiment includes active coupling band 61,62 and of passive coupling band The torsional spring 63 of connection therebetween, the active coupling band 61 are fixedly connected with output shaft 11, specifically active shaft coupling 61 one axis hole of setting of set, 11 shaft end of output shaft of the axis hole and motor 1 are interference fitted, the passive coupling band 62 and the biography Dynamic worm screw 2 is fixedly connected, and similarly, an axis hole, the shaft end interference of the axis hole and geared worm 2 is also provided on passive coupling band 62 Cooperation, and the torsional spring 63 generates radial contraction under the driving of active coupling band 61 or passive coupling band 62 and diameter is outside Expand.

The output shaft 11 of motor 1 is mounted in a gear-box 7, when radial contraction occurs for torsional spring 63, torsional spring 63 and tooth There are gaps between 7 inner wall of roller box, and damping force will not occur, and when torsional spring 63 occurs radially to extend out, can be sent out with 7 inner wall of gear-box Raw contact, so as to generate frictional force, which becomes as damping force.

In the present embodiment, in order to reduce the abrasion of 7 inner wall of gear-box, sleeve 71, sleeve 71 are installed in gear-box 7 It is set in outside torsional spring 63, when torsional spring 63 extends out, is close to sleeve 71, wear-resistant material may be used in sleeve 71, so as to subtract Less wear.

In the present embodiment, active coupling band 61, passive coupling band 62, torsional spring 63 specific connection structure：The torsional spring 63 End be bent to form bending segment 631, the active coupling band 61 is equipped with stirs institute for the direction that screws towards torsional spring 63 The first shifting block 611 of bending segment 631 is stated, which is preferably arc panel in the present embodiment, the passive coupling band 62 It is equipped with for towards the second shifting block 621 for unscrewing direction and stirring the bending segment 631 of torsional spring 63, second shifting block 621 to be at this Arc panel is preferably also in embodiment.

In the present embodiment the first shifting block 611 to bending segment 631 stir direction and the second shifting block 621 to bending segment 631 stir direction be it is opposite, in the present embodiment.When the bending segment 631 of torsional spring 63 is stirred along the first shifting block 611, It is identical with itself rotation direction of torsional spring 63 to stir direction, so as to screw torsional spring, torsional spring 63, which generates, radially to be inside contracted, and when torsional spring 63 When bending segment 631 is stirred by the second shifting block 621, stir direction and torsional spring 63 itself is oppositely oriented, torsional spring 63 is loosened, so as to Torsional spring 63 is generated radially to extend out.

First shifting block 611 and the second shifting block 621 after finishing assembly, are set with opposite direction, and 611 He of the first shifting block Second shifting block, 621 circumferentially spaced setting, i.e. the first shifting block 611 and the second shifting block 621 in circumferential direction, between each other there are Gap.The torsional spring 63 is set in outside the first shifting block 611 and the second shifting block 621, and the bending direction of the bending segment 631 is court The center bending of torsional spring 63, and the circumferentially-spaced gap between the first shifting block 611 and the second shifting block 621 is stretched into after bending, Concrete structure can be found in shown in Fig. 5.

During normal work, geared worm 2 is driven to rotate forward by motor 1, the first shifting block 611 rotation on active coupling band 61 connects It contacts on bending segment 631, so that torsional spring 63 occurs radially to inside contract, active coupling band 61 drives deformed torsional spring 63 to continue to turn It is dynamic, and contradict onto passive coupling band 62, it is rotated together so as to fulfill active coupling band 61, torsional spring 63, passive coupling band 62, this When torsional spring 63 and sleeve 71 between do not generate damping force substantially；

When power-off occurs or during other failures, when motor 1 does not work, thrust is generated by screw 4, so when be by being driven Worm screw 2 passes over active force, is that passive coupling band 62 first generates rotation at this time, the second shifting block on passive coupling band 62 621 first touch bending segment 631, so that torsional spring 63 occurs radially to extend out, torsional spring 63 can be with after occurring radially to extend out deformation Sleeve 71 is in contact, so as to generate damping force.

It is preferably oriented to and determines in order to enable the first shifting block 611 and the second shifting block 621 can have when stirring bending segment 631 Position effect, the first shifting block 611 is equipped with the first notch 611a for coordinating the torsional spring 63, when the first shifting block 611 touches torsional spring During 63 bending segment 631, bending segment 631 is just positioned in the first notch 611a, and similarly second shifting block 621 is equipped with Coordinate the second notch 621a of the torsional spring 63.

In the case of realizing that work as 61 active of active coupling band transmits into action edge, the still inverse time is either rotated clockwise Needle rotates, and can realize that 63 radial direction of torsional spring inside contracts, and the equal bending in both ends of the torsional spring 63 is formed with bending segment 631, referring to Fig. 3 and Fig. 5, by taking Fig. 5 as an example, the first shifting block 611 of active coupling band 61 is always positioned at the same side of two bending segments 631, i.e. in Fig. 5 Left side, under this state, as long as 61 active exposure bending segment 631 of active coupling band, either rotates clockwise or inverse Hour hands rotate, and torsional spring 63 can all occur radially to inside contract；

Similarly, the second shifting block 621 of passive coupling band 62 is always positioned at the same side of two bending segments 631, i.e. in Fig. 5 Right side, this design, as long as 62 active exposure bending segment 631 of passive coupling band, up time occurs for either passive coupling band 62 Needle rotation still rotates counterclockwise, and torsional spring 63 can all occur radially to extend out.

So it as long as is rotated by 1 active drive geared worm 2 of motor, either motor 1 is clockwise or counterclockwise Turn, can realize that undamped power is driven, and when by 2 driving motor 1 of geared worm, no matter geared worm 2 is to turn clockwise Or turn counterclockwise, can all generate damping force.Since the liter and drop of linear actuators are typically the clockwise and inverse time by motor 1 Needle is adjusted, therefore after being designed by the present embodiment, linear actuators it is normal rise and drop during, will not all be hindered Buddhist nun's power；And when power-off or other failures occur, during by 4 reverse drive of screw, either rise or decline, it all can be by very Big damping force.

It should be noted that the backstop in the present embodiment is only the preferred structure of holdback, art technology Personnel will be appreciated that in other embodiment holdback can select existing structure to be substituted, the structure of existing holdback It does not repeat excessively.

In addition, in the present embodiment, the connection further preferably between transmission worm gear 3 and screw 4 is improved, specifically and Speech is to be separately set both the transmission worm gear 3 and screw 4, wherein the transmission worm gear 3 is matched with the rotation connection of gear-box 7 The advantages of closing, and the axial releasable connection of the screw 4 and transmission worm gear 3, transmission worm gear 3 and screw 4 be subjected to independent design：It can To reduce the required precision of screw 4, because only needing to ensure that screw 4 is consistent with transmission worm gear 3 in concentricity, Precision on axial direction then requires relative reduction, so as to reduce processing cost, reduces the geometric tolerance of screw 4 to transmission worm gear 3rd, the influence of 2 meshing quality of geared worm.Meanwhile some vibrations of screw 4 in rotation process are shaken and will not directly be transmitted Onto transmission worm gear 3, the influence to transmission worm gear 3,2 meshing quality of geared worm can be also reduced to a certain extent, reduce noise.

As shown in Figure 6 to 7, transmission worm gear 3 and the connection structure of gear-box 7：Pillar is convexly equipped in the gear-box 7 72, the pillar 72 is tightened equipped with clutch shaft bearing 41, and the specifically inner ring of clutch shaft bearing 41 is interference fitted with pillar 72, institute It states transmission worm gear 3 to be sleeved on clutch shaft bearing 41, a bearing groove, the bearing groove and first is set on the end face of transmission worm gear 3 The outer ring interference fit of bearing 41, after being so designed that, transmission worm gear 3 is just located on gear-box 7.

And transmission worm gear 3 and the connection structure of screw 4：Pin has been recessed on the other end of the transmission worm gear 3 Slot 31 is radially equipped with lateral pin 40 on the screw 4, and the lateral pin 40 is fitted in the cotter way 31, this structure with And assembly method, it is all very low on infrastructure cost and assembly difficulty, it can greatly reduce the material cost and cost of labor of product.

In addition, lateral pin 40 is detached from away from screw 4 in order to prevent, the transmission worm gear 3 is at the both ends of the cotter way 31 Be provided with the barrier 311 for stopping that 40 both ends of lateral pin are detached from, in the present embodiment, be exactly in fact the two side ends of cotter way 31 not The peripheral surface of transmission worm gear 3 is communicated to, the peripheral surface so as to allow transmission worm gear 3 stops lateral pin 40.

The linear actuators further includes outer tube 8, in order to further improve the rotational stability of screw 4, the outer tube 8 Both ends are equipped with the second bearing 42 coordinated with the screw 4 and 3rd bearing 43, say on the whole, the rotation of screw 4 has three A bearing is positioned, i.e. clutch shaft bearing 41, second bearing 42,3rd bearing 43, and stability is relative to original linear activated Device is more preferable.

Inner tube is not provided in the present embodiment, outer groove 81 is offered on 8 wall of outer tube, 5 part of transmission nut is prolonged The outer groove 81 is stretched out, corresponding connecting hole etc. is set on transmission nut 5, for being connect with component to be lifted.

Embodiment 2：

Difference lies in the connection structure of transmission worm gear and screw is connected using spline to the present embodiment with embodiment 1 , i.e., spline is set in the transmission worm gear, and the end of the screw is equipped with the spline coordinated with the spline, spline It is axially inserted into spline and the two transmission can be realized.

The above, only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to In this, it is familiar with the those skilled in the art and should be understood that the utility model includes but not limited to attached drawing and above specific embodiment party Content described in formula.The modification of any function and structure principle without departing from the utility model is intended to be included in claims Range in.

Claims (8)

1. a kind of linear actuators, including motor, geared worm, transmission worm gear, screw and transmission nut, motor driving transmission snail Bar rotates, and transmission worm gear drives screw rotation, engaged transmission between geared worm and transmission worm gear, which is characterized in that the line Property actuator include gear-box, both the transmission worm gear and screw be separately set, the transmission worm gear and gear-box rotation company Connect cooperation, the screw and transmission worm gear axial direction releasable connection.

2. linear actuators as described in claim 1, which is characterized in that pillar, the pillar are convexly equipped in the gear-box It tightens equipped with clutch shaft bearing, the transmission worm gear is sleeved on clutch shaft bearing.

3. linear actuators as described in claim 1, which is characterized in that be recessed pin on the end face of the transmission worm gear Slot is radially equipped with lateral pin on the screw, and the lateral pin is fitted in the cotter way.

4. linear actuators as claimed in claim 3, which is characterized in that the transmission worm gear is set at the both ends of the cotter way There is the barrier for stopping that the lateral pin both ends are detached from.

5. linear actuators as described in claim 1, which is characterized in that the transmission worm gear is equipped with spline, the silk The end of bar is equipped with the spline coordinated with the spline.

6. linear actuators as described in claim 1, which is characterized in that the linear actuators includes outer tube, the outer tube Both ends the second bearing and 3rd bearing coordinated with the screw is installed.

7. linear actuators as described in claim 1, which is characterized in that the motor include output shaft, the output shaft with Both geared worms are separately set, and shaft coupling is equipped between the output shaft and geared worm.

8. linear actuators as described in claim 1, which is characterized in that the linear actuators further includes outer tube, the biography Dynamic nut axial movement offers outer groove on the outer tube on the outer tube wall, the transmission nut part is extended described Outer groove.