Linear actuator

• US 20050160846A1
• Filed: 01/20/2004
• Published: 07/28/2005
• Est. Priority Date: 01/20/2004
• Status: Abandoned Application

• Current Assignee: Jaeger Industrial Company, Ltd.
• Original Assignee: Jaeger Industrial Company, Ltd.
• Inventors: Chiang, Yi-Chung
• Application Number:
  US10/759,148
• Publication Number:
  US 20050160846A1
• Time in Patent Office: Days
• US Class Current: 74/89.350
• CPC Class Codes: F16H 1/16 comprising worm and worm-wheel
• CPC Class Codes: F16H 2025/2071 Disconnecting drive source from the actuator, e.g. using clutches for release of drive connection during manual control
• CPC Class Codes: F16H 2025/2084 Perpendicular arrangement of drive motor to screw axis
• CPC Class Codes: F16H 2025/209 using worm gears
• CPC Class Codes: F16H 25/20 Screw mechanisms with automatic reversal F16H25/12
• CPC Class Codes: H02K 7/06 Means for converting reciprocating motion into rotary motion or vice versa
• CPC Class Codes: Y10T 74/18672 Plural screws in series [e.g., telescoping, etc.]

Abstract

A linear actuator has two half-shells, a motor housing, a motor installed in the motor housing, a guiding screw driven by the motor, a screw nut engaged with the guiding screw, an interior tube encircling the guiding screw and connected with the screw nut at one end thereof, a moveable exterior tube telescoping the interior tube therein, at least two ball bearings subject to radial and axial load, and fitting seat installed in the half-shells. The fitting seat has to bearing seats for mounting the ball bearings, such that the load capacity of the linear actuator is increased, while the application safety is enhanced.

Claims

1. A linear actuator, comprising:

two half-shells joined together to form a chamber;

a motor housing extending outwardly from one of the half-shells, the motor housing being in communication with the chamber;

a motor installed in the motor housing for driving a motor shaft extending towards into the chamber, the motor shaft including a worm;

a guiding screw having a threaded section and a fitting section connected as a line, wherein the threaded section includes a worm gear to be intermeshed with the motor shaft, the fitting section extends into the chamber to be mounted to a rear arm extending out of the half-shells from a rear end thereof, and the threaded section extends out of the half-shells from a front end thereof, the threaded section includes a screw nut;

an interior tube encircling the guiding screw and having a rear end connected to the screw nut, the interior tube including a connection member at a front end thereof;

an exterior tube telescopically receiving the interior tube therein, the exterior tube having a rear end extending into the chamber and a front end allowing the connection member to extend out of the chamber;

at least two ball bearings installed in the fitting section at two sides of the worm gear; and

a fitting seat installed in the chamber allowing the fitting section to extend through, the fitting seat including a worm gear seat and two bearing seats for receiving the worm gear and the ball bearings therein.

2. The actuator of claim 1, wherein the ball bearings have different sizes.

3. The actuator of claim 1, wherein the fitting seat has a front end connected to an exterior tube sleeve which receiving the rear end of the exterior tube therein.

4. The actuator of claim 3, wherein the fitting seat has a rear end connected to the rear arm.

5. The actuator of claim 3, wherein the front end of the exterior tube further comprises a fitting lid to cover the interior tube.

6. The actuator of claim 1, wherein the fitting seat has a rear end connected to the rear arm.

7. The actuator of claim 1, wherein the front end of the exterior tube further comprises a fitting lid to cover the interior tube.

8. The actuator of claim 1, further comprising a control member, an interlock member connected to the control member and a clutch member to be engaged and disengaged with the worm gear, wherein the clutch member is installed at the fitting section and fitted at a proximal end of the worm gear, while a distal end of the worm gear includes a resilient member.

9. The actuator of claim 8, wherein the clutch member is fitted at the fitting section by a fitting member.

10. The actuator of claim 9, wherein the fitting member includes a bolt.

11. The actuator of claim 8, wherein the resilient member includes spring.