阅读说明：本技术 驱动装置 (Drive device ) 是由 马达利纳·格尔曼 米哈伊·奥古斯丁·维德雷安 谢尔盖·马泽帕 芒努斯·许梅里希 于 2019-07-26 设计创作，主要内容包括：本发明涉及一种具有驱动马达3的驱动装置,驱动马达的驱动轴在克服借助预受力的弹簧由摩擦制动器7产生的一定制动力的情况下能够可转动地直接或者间接驱动丝杠9。驱动马达3和丝杠9在此同轴地布置在套管2中,并且摩擦制动器7的部件布置在管状的制动壳体16中,制动壳体在轴向上固定地并且抗扭地布置在套管2中,并且制动壳体在其第一端部具有一个或多个径向向内指向的第一止挡凸肩18,并且在其第二端部具有一个或多个径向向内指向的第二止挡凸肩。制动壳体16在其第一端部形成径向环绕的环17,一个或者多个径向上有弹性的弹簧支臂19从该环出发沿轴向朝第二端部延伸,在弹簧支臂的自由端处布置有第二止挡凸肩。(The invention relates to a drive device having a drive motor 3, the drive shaft of which can rotatably drive a spindle 9 directly or indirectly against a certain braking force generated by a friction brake 7 by means of a prestressed spring. The drive motor 3 and the spindle 9 are arranged coaxially in the sleeve 2, and the components of the friction brake 7 are arranged in a tubular brake housing 16, which is arranged in the sleeve 2 in an axially fixed and rotationally fixed manner and which has one or more first stop shoulders 18 directed radially inward at its first end and one or more second stop shoulders directed radially inward at its second end. The brake housing 16 forms a radially encircling ring 17 at its first end, from which one or more radially elastic spring limbs 19 extend axially toward the second end, at the free ends of which second stop shoulders are arranged.)

1. A drive device having a drive motor (3), the drive shaft of which can directly or indirectly drive a spindle (9) in a rotatable manner against a certain braking force generated by a friction brake (7) by means of a prestressed spring, wherein the drive motor (3) and the spindle (9) are arranged coaxially in a sleeve (2) and the components of the friction brake (7) are arranged in a tubular brake housing (16) which is arranged fixedly and rotationally fixed in the sleeve (2) in the axial direction and which has one or more first stop shoulders (18) directed radially inward at a first end of the brake housing and which has one or more second stop shoulders directed radially inward at a second end of the brake housing, characterized in that the brake housing (16) forms a radially encircling ring (17) at a first end of the brake housing, from which ring one or more radially elastic spring limbs (19) extend axially towards the second end, at the free ends of which the second stop shoulder is arranged.

2. The drive device as claimed in claim 1, characterized in that a plurality of spring limbs are formed uniformly distributed at radial distances from one another at the circumference of the brake housing.

3. The drive device as claimed in one of the preceding claims, characterized in that the second stop shoulder is configured as a locking hook (20) which extends radially on its inner side facing the interior of the brake housing (16) and which, on its outer side facing away from the interior of the brake housing (16), slopes from a radially outer portion towards a radially inner portion towards the interior of the brake housing (16).

4. The drive device according to one of the preceding claims, characterized in that a prestressed pressure spring (25) is supported in the axial direction at the first stop shoulder (18), which acts in the axial direction via a first thrust plate (26) on a brake disk (27), which in turn is supported in the axial direction via a second thrust plate (28) at the second stop shoulder, wherein the first and second thrust plates (26, 28) which are movable in the axial direction are connected in a rotationally fixed manner to the brake housing (16) and the brake disk (27) which is movable in the axial direction is connected in a rotationally fixed manner to the spindle (9).

5. The drive device according to one of the preceding claims, characterized in that the brake housing (16) is supported with its first end in the axial direction directly or indirectly at a support ring (14, 15) which is arranged fixedly in the axial direction in the sleeve (2).

6. The drive arrangement according to any one of the preceding claims, characterized in that the brake housing (16) is supported with its second end in the axial direction directly or indirectly at a guide bushing (21) which is arranged fixedly in the axial direction in the sleeve (2).

7. The drive device according to any one of the preceding claims, characterized in that the drive shaft (8) is engaged with the lead screw (9) via an elastic coupling.

8. The drive according to claim 7, characterized in that the spindle (9) is rotatably mounted by means of a rolling bearing (13) arranged between the brake housing (16) and the elastic coupling.

9. The drive of any one of the preceding claims, wherein the brake housing (16) is made of a synthetic material.

Technical Field

The invention relates to a drive device having a drive motor, the drive shaft of which can directly or indirectly drive a spindle in a rotatable manner against a certain braking force generated by a friction brake by means of a prestressed spring, wherein the drive motor and the spindle are arranged coaxially in a sleeve and the components of the friction brake are arranged in a tubular brake housing, which is arranged axially fixed and rotationally fixed in the sleeve and which has one or more first stop shoulders directed radially inward at its first end and one or more second stop shoulders directed radially inward at its second end.

Background

It is known for such drives to form a first stop shoulder and/or a second stop shoulder from a three-dimensionally curved flange-like projection at the first end and/or the second end of the brake housing made of metal. After the components of the friction brake are inserted into the brake housing, these flange-like projections are bent three-dimensionally radially inwardly, so that the friction brake forms a preassembled assembly which simplifies the installation of the drive device. In order to maintain the braking force constantly during the life of the drive, the components of the friction brake must remain in the same position also during the life of the drive.

However, the disadvantages of the curved flange-like projections are: the flange-like projection can bend back somewhat over time under the long-term loading of the force by the prestressed spring, which leads to a change in the position of the components of the friction brake and thus to a reduction in the braking force and thus also to a lowering of the projecting spindle.

Disclosure of Invention

The object of the invention is achieved by a drive of the type mentioned above, which is easy to install and in which the braking force of the friction brake is at least as constant as possible over the life of the drive.

This object is achieved according to the invention in that the brake housing forms a radially encircling ring at its first end, from which one or more radially elastic spring limbs extend axially toward the second end, at the free ends of which spring limbs a second stop shoulder is arranged.

By means of this configuration, the components of the friction brake can be inserted into the brake housing with the spring arm elastically expanding in the radial direction, and the brake housing retains all the components together in the brake housing and forms a preassembled structural unit by the spring arm springing back into its axial starting position.

After the brake housing of the friction brake unit has been subsequently introduced into the bushing, the spring leg and the second stop shoulder are then prevented by the bushing from deflecting radially outward and thus the second stop shoulder is permanently held in its position. The braking force of the friction brake is thereby kept at least as constant as possible over the life of the drive.

The brake housing is preferably formed in one piece with the radially encircling ring, the spring leg and the second stop shoulder.

In order to facilitate the plug-in assembly of the components of the friction brake, a plurality of spring arms can be formed uniformly distributed at radial distances from one another at the circumference of the brake housing.

The second stop shoulder is designed as a latching hook which extends radially on its inner side facing the interior of the brake housing and which, on its outer side facing away from the interior of the brake housing, is inclined from the radially outer side to the radially inner side towards the interior of the brake housing, thereby forming a run-in ramp, by means of which the spring arm is automatically deflected radially outward when the component is introduced into the brake housing, so that it is deflected back again into its radial starting position after passing the second stop shoulder.

The design of the second stop shoulder as a locking hook has the additional advantage that, due to this design, an upward bending of the second stop shoulder is particularly well avoided.

The design of the friction brake, which is easy to install, provides: a prestressed pressure spring device is supported in the axial direction at the first stop shoulder, which acts axially via a first thrust plate on a brake disk, which in turn is supported in the axial direction at the second stop shoulder via a second thrust plate, wherein the axially displaceable thrust plates are connected in a rotationally fixed manner to the brake housing and the axially displaceable brake disk is connected in a rotationally fixed manner to the spindle.

It should be understood that not only one brake disc can be arranged between two thrust plates, but also a plurality of brake discs can be arranged between a plurality of thrust plates.

The rotationally fixed connection of the thrust plate to the brake housing can be formed here by a projection projecting radially at the circumference of the thrust plate, which projection projects with an axially extending distance between the spring legs of the brake housing.

The rotationally fixed connection of the brake disk to the spindle can be formed by a toothed rack at the spindle, on which a brake disk having a central groove is arranged, which corresponds to the contour with the sliding bearing.

In order to fix the friction brake in the sleeve in one axial direction, the brake housing can be supported with its first end in the axial direction directly or indirectly on a support ring which is arranged in the sleeve in an axially fixed manner.

In order to fix the friction brake in the other axial direction in the sleeve, the brake housing can be supported with its second end in the axial direction directly or indirectly at a guide bush which is arranged fixedly in the sleeve in the axial direction.

The drive shaft can be coupled to the spindle via an elastic coupling.

In order to mount the spindle near the drive shaft near the end of the spindle, the spindle can be rotatably mounted by means of a roller bearing arranged between the brake housing and the elastic coupling.

The brake housing is made of a dimensionally stable synthetic material, so that it can be produced separately and inexpensively.

Drawings

Embodiments of the invention are illustrated in the drawings and described in more detail below.

Figure 1 shows a part of a drive device in longitudinal section,

figure 2 shows a detail of the drive according to figure 1 in a further longitudinal section,

figure 3 shows a detail of the drive according to figure 1 in a third longitudinal section,

figure 4 shows a side view of the brake housing of the drive according to figure 1,

figure 5 shows a perspective view of the brake housing according to figure 4,

figure 6 shows a longitudinal section through the brake housing according to figure 4,

figure 7 shows an enlarged detail "Y" in figure 6,

fig. 8 shows an enlarged, partial "X" in fig. 6.

Detailed Description

The drive device shown in the figures has a tubular drive housing 1 into which a sleeve 2 is inserted.

Arranged axially in the sleeve 2 are: a drive motor 3 in the form of an electric motor, a transmission 4, a coupling 5, a bearing unit 6 and a friction brake 7.

The drive motor 3 drives a spindle 9 in a rotatable manner via a transmission 4 from a drive shaft 8 of the drive motor via a coupling 5.

The coupling 5 is an elastic coupling, wherein a radially enlarged end 10 of the drive shaft is connected to a bushing element 12, which is fixedly arranged on the spindle 9, via an elastic ring 11 radially surrounding the end 10.

The bushing element 12 and the spindle 9 using it are in turn rotatably mounted via a rolling bearing 13 designed as a radial ball bearing in a first bearing ring 14 inserted into the sleeve 2, which is axially supported in the axial direction toward the drive motor 3 on a second bearing ring 15, which is in turn connected fixedly in the axial and radial directions to the sleeve 2.

A tubular brake housing 16 of the friction brake 7, which is made of synthetic material and is inserted into the sleeve 2, is supported in the axial direction on the end face of the first support ring 14 facing away from the drive motor 3.

At its first end facing the drive motor 3, the brake housing 16 has a radially encircling ring 17, at the free end of which a flange-like, radially inwardly directed first stop shoulder 18 is arranged.

A plurality of radially elastic spring limbs 19 distributed circumferentially extend from the ring 17 toward the second end of the spring limbs remote from the drive motor 3, at whose free ends radially inwardly directed locking hooks 20 are arranged which form a second stop shoulder. On its outer side facing away from the interior of the brake housing 16, the locking hooks 20 are inclined from the radially outer side toward the radially inner side toward the interior of the brake housing 16 and thus form a ramp, against which the spring legs 19 are deflected radially outward when a load is applied in the axial direction by the component of the friction brake to be inserted.

The side of the locking hook 20 closer to the interior of the brake housing 16 extends radially inward.

By means of its outer side facing away from the interior of the brake housing 16, the locking hook 20 is supported in the axial direction on a guide bush 21 inserted into the sleeve 2, which guide bush is connected fixedly in the radial and axial directions to the sleeve 2.

In an alternating manner, an axially extending distance 22 is formed between the two spring limbs on the one hand, and an axially extending anti-rotation arm 23 is formed over the length of the spring limbs on the other hand.

The rotation-prevention arms 23 project with their free ends into corresponding recesses 24 in the guide bush 21, so that the brake housing 16 is arranged in the sleeve 2 in a rotationally fixed manner.

The structure in which the brake housing 16 is provided between the first support ring 14 and the guide bush 21 also fixes the brake housing 16 in the sleeve 2 in the axial direction.

A prestressed, annular pressure spring 25 is provided in the brake housing 16, which is supported axially at the first stop shoulder 18 and axially loads the first thrust plate 26.

On the side facing away from the pressure spring 25, a first thrust plate 26 bears axially against the side of the brake disk 27 and, on the other side of the brake disk, a second thrust plate 28, which in turn bears axially against the side of the locking hook 20 closer to the interior of the brake housing 16.

In the region of the spacings 22 between the spring legs 19, the first thrust disk 26 and the second thrust disk 28 have projections 29 which project radially outward into these spacings 22 and by which the first thrust disk 26 and the second thrust disk 28 are held in a rotationally fixed manner. In the gap 22, the projecting portion 29 and the first and second thrust plates 26, 28 are freely movable in the axial direction.

In the region through which the brake housing 16 passes, a toothed bushing 30 is fixedly arranged on the spindle 9, which on its circumferential outer circumferential surface is equipped with an axially extending outer spline 31.

The brake disk 27 has a coaxial passage opening which is equipped with an inner rack corresponding to an outer rack into which the outer rack of the toothed bushing 30 meshes, so that the brake disk 27 is connected in a rotationally fixed manner to the spindle 9, but can move freely on the toothed bushing 30.

By means of the prestress of the compression spring 25, the first thrust plate 26 presses against the brake disk 27 and the brake disk 27 presses against the second thrust plate 28, which is supported in the axial direction at the locking hook 20, so that a certain braking torque must be overcome by the drive motor 3 when the drive spindle 9 is rotated.

When the spindle 9 is not driven, it is held in its current position in a rotationally fixed manner by means of this braking torque.

List of reference numerals

1 drive housing

2 casing

3 drive motor

4 driving device

5 shaft coupling

6 bearing unit

7 Friction brake

8 drive shaft

9 leading screw

10 end of

11 elastic ring

12 bushing element

13 rolling bearing

14 first support ring

15 second support ring

16 brake housing

17 Ring

18 first stop shoulder

19 spring arm

20 locking hook

21 guide bush

22 space apart

23 anti-rotation arm

24 groove

25 pressure spring device

26 first thrust plate

27 brake disc

28 second thrust plate

29 projection

30 tooth bush

31 outer rack.