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Actuator With Friction Device Using Loop Spring Element

A technology of friction devices and actuators, applied in the field of actuators, can solve problems such as increasing costs, maintaining torque, and making installation difficult, and achieve the effect of reducing costs

Active Publication Date: 2016-11-02
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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  • Actuator With Friction Device Using Loop Spring Element
  • Actuator With Friction Device Using Loop Spring Element
  • Actuator With Friction Device Using Loop Spring Element

Examples

Experimental program
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Embodiment Construction

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

[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 an outer diameter dA contacts The inner diameter D6 of the hub 6 is force-fittingly connected with the inner diameter in the first rotation direction. The second active area B is located on the outer diameter d3 of the ring gear 3 with its inner diameter DB and surrounds...

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PUM

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Abstract

The invention provides an actuator with friction device using a loop spring element. The friction device comprises at least two relatively rotatable components and a loop spring element which is arranged between the relatively rotatable components for influencing efficiency / friction during relative rotation of the components, and the loop spring element comprises at least two mutually connected effective ranges. One effective range of the loop spring element comprises a support spring at the inside diameter or the outside diameter, wherein the support spring is disposed in the blocking area of the loop spring element.

Description

Technical field [0001] The present invention relates to an actuator having a friction device using a wrap spring element, wherein the friction device has at least two components rotatable relative to each other and the actuator is particularly used in a transmission of a motor vehicle. Background technique [0002] The actuator is used, for example, to operate a clutch of a vehicle, and can convert the rotational movement of a component into the axial movement of another component. Here, the actuator itself can be any type of linear actuator, such as a PWG actuator (PWG=Planetary Roller Thread Driver), a hydraulic slave cylinder, etc. [0003] The planetary roller screw drive (PWG) is formed by a screw, a screw nut, and a planetary roller body arranged on the circumference between them and contained in a planet carrier. Here, the screw, the screw nut and the planetary roller body have contours for transmitting rotational movement between the screw and the screw nut, wherein one of...

Claims

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Application Information

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Patent Type & Authority Applications(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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