Actuators with friction devices using wrap spring elements

A friction device and actuator technology, applied in the field of actuators, can solve the problems of increasing cost, difficulty in installation, inability to maintain position, etc., and achieve the effect of reducing cost

Active Publication Date: 2020-02-14
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For example, especially in actuators, such as hydrostatic clutch actuators (Hydrostatic Clutch Actuator—abbreviated HCA) in the efficiency-optimized screw drive (such as PWG) driven by an electric motor, there is the following problem: A holding current and thus a holding torque is required in the electric motor, since the screw drive (eg in a PWG) is not self-locking, the hydrostatic clutch actuator working against a load, eg a clutch characteristic curve
A decisive disadvantage of such actuators is that they require a permanent holding current or are not able to hold the position in the event of a current failure / fault (e.g. cable break, plug falling out)
Of course, there are disadvantages here: the multi-part design of the wrap spring makes installation more difficult and costs are increased due to the use of connecting elements connecting the two wrap spring regions

Method used

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  • Actuators with friction devices using wrap spring elements
  • Actuators with friction devices using wrap spring elements
  • Actuators with friction devices using wrap spring elements

Examples

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Embodiment Construction

[0033] exist figure 1 shows an actuator according to the invention with a planetary roller screw drive (PWG) 1 having a screw 2 and a ring gear 3 between which planetary rollers 4 mesh. Ring gear 3 (sleeve) is operatively connected on its outer diameter, which acts as a shaft, to hub 6 by means of wrap spring elements 5 in the form of double wrap springs. figure 2 A schematic diagram of the ring gear 3 and the hub 6 is shown, between which the wrap spring element 5 is arranged.

[0034] according to figure 2 , the wrap spring element 5 has a first active area A with a contact area with the hub 6 and a second active area B with a contact area with the ring gear 3, wherein the first active area A with the outer diameter dA contacts The inner diameter D6 of the hub 6 is also non-positively connected with said inner diameter in the first rotational direction. The second active region B lies with its inner diameter DB on the outer diameter d3 of the ring gear 3 and surrounds it....

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PUM

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Abstract

The invention relates to an actuator with a friction device using a wrap spring element, wherein the friction device has at least two components which are rotatable relative to each other and is provided between the components which are rotatable relative to each other and which influences the efficiency during the relative rotation of the components / A frictional spring element having at least two active regions connected to one another. One of the two active regions of the wrap spring element has a supporting spring on the inner or outer diameter, wherein the supporting spring is arranged in the locked region of the wrap spring element.

Description

technical field [0001] The invention relates to an actuator with a friction device using a wrap spring element, wherein the friction device has at least two components that are rotatable relative to one another and the actuator is used in particular in a transmission of a motor vehicle. Background technique [0002] The actuator is used, for example, to operate a clutch of a vehicle and is capable of converting a rotational movement of a component into an axial movement of another component. In this case, the actuator itself can be any type of linear actuator, for example a PWG actuator (PWG=planetary roller thread drive), a hydraulic slave cylinder or the like. [0003] A planetary roller screw drive (PWG) is formed from a spindle, a spindle nut and a planetary roller body arranged between them on the circumference and accommodated in a planetary carrier. Here, the screw, the screw nut and the planetary roller bodies have contours for the transmission of a rotational movem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D23/12
CPCF16D23/12F16D3/52F16D3/56F16D2025/081
Inventor 拉斯洛·曼拉尔斯·舒曼
Owner SCHAEFFLER TECH AG & CO KG
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