Actuator comprising motor

Abstract

The invention relates to an actuator comprising a motor transmission, the motor having a stator and a rotor (12, 2) comprising at least one permanent magnet (2), the transmission having a first gearwheel (11) and a second gearwheel (3) which mesh with each other, the actuator having a plastic part (1), the rotor (12, 2) has a plastic part forming a part of the rotor (12, 2) and a first gear (11), in which the permanent magnets are embedded, and in which the gears (11, 3) have helical tooth meshes.

Description

Technical Field

[0001] This invention relates to an actuator comprising a motor and a transmission.

[0002] The motor has a stator and a rotor including at least one permanent magnet.

[0003] The transmission has a first gear and a second gear that mesh with each other, and

[0004] The actuator has a plastic component that forms part of the rotor and the first gear.

[0005] The permanent magnet is embedded in the plastic component. Background Technology

[0006] Such a motor is known from document DE102013022654B3.

[0007] Actuators in motor vehicles often need to be small because there is often very little space available for their installation. That is, the actuators must be small and also inexpensive. These requirements result in small transmission gears, which often have a large number of teeth. This large number of teeth typically causes acoustic problems at high speeds in the first gear.

[0008] To date, the following measures have been taken to address these issues:

[0009] One approach is to use fewer teeth on the gear in first gear, thereby achieving a smaller wheelbase. This results in a lower frequency of excitation, thus addressing acoustic issues. Other gears are then needed to compensate for this.

[0010] In another measure, a retaining arm and / or spring are used to stabilize the first gear of the transmission.

[0011] In addition, a grease reservoir is provided, which can be used to achieve improved system damping in the first gear of the transmission.

[0012] Furthermore, it is known that a gear with high meshing is selected, in which at least two teeth are simultaneously engaged.

[0013] The first three measures, in particular, are associated with additional structural costs. The added components make the instrument more expensive. The last measure results in at least larger gears. Summary of the Invention

[0014] This invention begins here. The problem upon which this invention is based is noise reduction in a high-speed transmission comprising small gears with a high number of teeth.

[0015] This problem is solved according to the present invention by having a helical gear meshing portion.

[0016] The helical gear engagement reduces frequency excitation in this first gear position, resulting in a significant reduction in sound intensity level [dB(A)]. Compared to the measures mentioned above, the helical gear engagement achieves acoustic optimization with less cost and structural space.

[0017] The plastic component of the actuator according to the present invention can be a plastic injection molded part. In this case, the permanent magnet can be encapsulated in plastic by the plastic injection molding of the plastic injection molded part.

[0018] It is possible that the second gear is a plastic component, especially a plastic injection molded part.

[0019] The helical tooth engagement portion can have an inclination angle of approximately 30°.

[0020] The plastic component can be made of POM. The second gear can be made of PA, especially PA6 GF40. However, it is not limited to these plastics.

[0021] A lubricating film made of grease can be formed between the first gear and the second gear.

[0022] The plastic component may have a sleeve or a hollow cylinder. On the outer side of the sleeve or hollow cylinder, teeth of a first gear are provided in one region, and two outwardly projecting flanges are provided in another region on the outer side. At least one permanent magnet is embedded between the flanges. The sleeve can be inserted into a shaft. The shaft may be non-rotatable or rotatable within the sleeve.

[0023] The flanges may have protruding elements between the flanges on opposite sides and / or the sleeve may have protruding elements on its outer side. The permanent magnet may have gaps into which these protruding elements are fitted. This allows the permanent magnet to be connected to the sleeve in a non-rotatable manner.

[0024] The motor can be a brushless DC motor. Attached Figure Description

[0025] The accompanying drawings further illustrate an embodiment of an arrangement structure that is part of the actuator according to the invention and includes a plastic component, a permanent magnet, and a second gear. Wherein:

[0026] Figure 1 A view showing the arrangement including transparent permanent magnets;

[0027] Figure 2 A top view of the arrangement structure is shown and

[0028] Figure 3 Showing according to Figure 2 A cross-sectional view of line AA in the diagram. Detailed Implementation

[0029] The arrangement shown in the accompanying drawings, which can be incorporated into the actuator according to the invention, includes a plastic component 1, a permanent magnet 2, a second gear 3, a first shaft 4, and a second shaft 5.

[0030] The plastic component 1 is a plastic injection molded part. The plastic injection molded part has sleeves 11 and 12 including a first region 11, the sleeves forming a first gear of the arrangement. The teeth of the first gear have an inclination angle of approximately 30°. A flange 13 is connected to a second region 12 of the sleeves 11 and 12. These flanges are spaced apart from each other corresponding to the width of the permanent magnet 2. The permanent magnet is also formed by the sleeves. The permanent magnet is mounted on the second region 12 and between the flanges 13.

[0031] Protruding elements 14 are provided between the two flanges 13, on the mutually facing sides of the flanges 13 and on the outer side of the second region 12 connected to the sleeve. These elements are fitted into the gaps in the permanent magnet 2, which are distributed on the inner side of the permanent magnet 2. These elements 14 fitted into the gaps in the permanent magnet 2 prevent the permanent magnet 2 from rotating relative to the plastic part 1.

[0032] Plastic component 1 is an injection-molded part that is injected onto permanent magnet 2.

[0033] The plastic component 1 and the permanent magnet 2 form the rotor of the motor of the actuator according to the present invention.

[0034] The first shaft 4 is inserted into the sleeves 11 and 12, and the plastic parts 1 and shaft 4 are connected to each other in a non-rotatable manner.

[0035] The second gear 3 is also a plastic injection molded part. The plastic injection molded part includes a first region 31 having a first diameter and a second region 32 having a diameter smaller than the first diameter. The first region 31 engages with the first gear in a complementary helical gear configuration. A spur gear engagement portion is provided in the second region 32, on which the movement of the second gear can be obtained.

[0036] List of reference numerals

[0037] 1 Plastic parts

[0038] 11 First Zone / First Gear

[0039] 12 Second Zone /

[0040] 13 flanges

[0041] 14 prominent components

[0042] 2 permanent magnets

[0043] 3 Second gear

[0044] 31 The first region of the second gear

[0045] 32 Second region of the second gear

[0046] 4 First Axis

[0047] 5 Second Axis

Claims

1. An actuator including a motor and a transmission. in, The motor has a stator and a rotor (12, 2) including at least one permanent magnet (2). The transmission has a first gear (11) and a second gear (3) that mesh with each other, and The actuator has a plastic component (1) that forms part of the rotor (12, 2) and a first gear (11). The permanent magnet is embedded in the plastic component. Its features are, The gears (11, 3) have helical tooth meshing portions.

2. The actuator according to claim 1, characterized in that, The plastic component (1) is a plastic injection molded part and the permanent magnet (2) is encapsulated in plastic injection mold of the plastic injection molded part.

3. The actuator according to claim 1 or 2, characterized in that, The second gear (3) is a plastic part, especially a plastic injection molded part.

4. The actuator according to any one of claims 1 to 3, characterized in that, The helical tooth engagement portion has an inclination angle of approximately 30°.

5. The actuator according to any one of claims 1 to 4, characterized in that, The plastic component (1) is made of POM.

6. The actuator according to any one of claims 1 to 5, characterized in that, The second gear (3) is made of PA, especially PA6 GF40.

7. The actuator according to any one of claims 1 to 6, characterized in that, A lubricating film made of grease is formed between the first gear and the second gear (11, 3).

8. The actuator according to any one of claims 1 to 7, characterized in that, The plastic component (1) has a sleeve (11, 12), on the outside of the sleeve, in one region the teeth of a first gear (11) are provided, and on the outside the sleeve, in another region (12) two outwardly protruding flanges (13) are provided, and at least one permanent magnet (2) is embedded between the flanges.

9. The actuator according to claim 8, characterized in that, The flanges (13) have protruding elements (14) on their opposite sides and / or the sleeve (12) on its outer side, between the flanges (13), and the permanent magnet (2) has a gap into which the protruding elements (14) are fitted.

10. The actuator according to any one of claims 1 to 9, characterized in that, The motor is a brushless DC motor.

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