Actuating electromotor for technical devices, in particular in motor vehicles

• US 6,223,615 B1
• Filed: 08/31/1999
• Issued: 05/01/2001
• Est. Priority Date: 06/17/1997
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Huck, Thomas
• Primary Examiner(s): FENSTERMACHER, DAVID MORGAN
• Application Number:
  US09/367,857
• Time in Patent Office: 609 Days
• Field of Search: 464/89, 464/75, 403/359.1, 403/359.6, 403/372, 74/425, 74/427, 74/451
• US Class Current: 74/425
• CPC Class Codes: B60R 16/037 for occupant comfort , e.g. for automatic adjustment of appliances according to personal settings, e.g. seats, mirrors, steering wheel
• CPC Class Codes: F16H 1/16 comprising worm and worm-wheel
• CPC Class Codes: F16H 57/0025 with gearing elements rigidly connected to a shaft, e.g. securing gears or pulleys by specially adapted splines, keys or methods
• CPC Class Codes: H02K 7/1166 comprising worm and worm-wheel structural association with bearings specially adapted for worm gear drives H02K7/081
• CPC Class Codes: Y10T 403/7035 Specific angle or shape of rib, key, groove, or shoulder
• CPC Class Codes: Y10T 74/19828 Worm
• CPC Class Codes: Y10T 74/19842 Distribution of pressure

Abstract

The subject matter of the invention is an electric motor-driven servo-drive for use in technical means, especially motor vehicles, with a small electric drive motor (2) with a motor shaft (4) which is provided with a gear form-fit element (3) at at least one location, proceeding especially from the end, with a worm (5) of a worm gear pair, the worm (5) slipped onto the motor shaft (4), and with a worm wheel (6) of the worm gear pair, the wheel (6) consisting preferably of plastic and coupled to the worm (5) via teeth which engage one another. It is characterized in that the worm (5) consists of plastic, that a driver (7) consisting of a harder material which transfers higher torques than the plastic of the worm (5) is slipped onto the motor shaft (4) and with the corresponding shaft form-fit element engages the gear form-fit element (3) of the motor shaft (4), that the driver (7) on a diameter which is much greater than that of the motor shaft (4) has a worm form-fit element, and that the worm (5) for its part has a driver form-fit element which engages the worm form-fit element of the driver (7).

Claims

1. Electric motor-driven servo-drive comprising a small electric drive motor with a motor shaft, a worm of a worm gear pair, the worm being made of plastic and being slid onto the motor shaft, a driver made of a harder material which transfers higher torques than the plastic of the worm on the motor shaft, a worm wheel of the worm gear pair, the wheel being made of plastic and being coupled to the worm via teeth which engage one another, the driver having a worm form-fit element of a diameter which is much greater than that of the motor shaft and the worm having a driver form-fit element which engages the worm form-fit element of the driver;

wherein the motor shaft is provided with a gear-form fit element at at least one location;

wherein the driver is slid onto the motor shaft and has a corresponding shaft form-fit element which engages the gear form-fit element of the motor shaft;

wherein the gear and shaft form-fit elements which engage one another have flat areas;

wherein the worm has a slip-on mount for the driver on an end facing the drive motor;

wherein the driver is made of a material selected from the group consisting of a metal, a metal combination or a metal alloy; and

wherein the driver is a generally ring-shaped punched part.

2. Servo-drive as claimed in claim 1, wherein the driver has a radial groove into which a driving tang on the motor shaft fits.

3. Servo-drive as claimed in claim 2, wherein the worm and the driver are axially movable relative to the motor shaft.

4. Servo-drive as claimed in claim 2, wherein the driver is fixed on the slip-on mount by catching.

5. Servo-drive as claimed in claim 1, wherein the worm and the driver are axially movable relative to the motor shaft.

6. Servo-drive as claimed in claim 1, wherein the driver is fixed on the slip-on mount by catching.