Actuator Gearbox

Patent metadata

Field	Value
Publication number	US-2016369883-A1
Application number	US-201615184152-A
Country	US
Kind code	A1
Filing date	Jun 16, 2016
Priority date	Jun 19, 2015
Publication date	Dec 22, 2016
Grant date	—

Abstract

An actuator includes a motor and a gearbox connected with the motor. The gearbox has a lower housing, a gear received in the lower housing, and a cover disposed at one end of the lower housing. The lower housing has a support shaft supporting the gear for rotation relative to the lower housing. The support shaft is hollow. A core shaft is inserted into the support shaft. The core shaft is made of a metal material and the support shaft is made of a plastic material.

First claim

1 . An actuator gearbox comprising:
a lower housing comprising a support shaft, the support shaft being hollow and made of a plastic material; a gear received in the lower housing and supported by the support shaft for rotation relative to the lower housing; a cover disposed at one end of the lower housing; and a core shaft inserted into the support shaft, the core shaft being made of a metal material.

2 . The gearbox of claim 1 , wherein the support shaft and the lower housing are integrally formed by injection molding.

3 . The gearbox of claim 1 , wherein a center hole is formed in the support shaft, and the core shaft is an interference-fit in the center hole of the support shaft.

4 . The gearbox of claim 3 , wherein the center hole is a blind hole with one end closed and the other end opened.

5 . The gearbox of claim 3 , wherein at least a portion of an outer surface of the core shaft and an inner wall surface of the center hole form a gap there between.

6 . The gearbox of claim 5 , wherein the center hole is a round hole, and at least a portion of the outer surface of the core shaft is formed with knurls.

7 . The gearbox of claim 5 , wherein the gap between the core shaft and the center hole is formed by a ventilation groove extending axially along the inner wall surface of the center hole.

8 . The gearbox of claim 7 , wherein a ratio of a width of an opening of the ventilation groove in the center hole and a diameter of the center hole ranges from 0.1 to 0.5.

9 . The gearbox of claim 1 , wherein the core shaft is made of steel.

10 . The gearbox of claim 1 , wherein a ratio of a diameter of the core shaft to a diameter of the support shaft ranges from 0.1 to 0.75.

11 . An actuator comprising:
a motor; and a gearbox connected with the motor, the gearbox comprising: a lower housing comprising a support shaft, the support shaft being hollow and made of a plastic material; a gear received in the lower housing and supported on the support shaft for rotation relative to the lower housing; a cover disposed at one end of the lower housing; and a core shaft inserted into the support shaft, the core shaft being made of a metal material.

12 . The actuator of claim 11 , wherein the gear is a worm gear driven by a worm formed on a shaft of the motor.

13 . The actuator of claim 11 , wherein a center hole is formed in the support shaft, and the core shaft is an interference-fit in the center hole of the support shaft.

14 . The actuator of claim 13 , wherein the center hole is a blind hole with one end closed and the other end opened.

15 . The actuator of claim 13 , wherein at least a portion of an outer surface of the core shaft and an inner wall surface of the center hole form a gap there between.

16 . The actuator of claim 15 , wherein the center hole is a round hole, and at least a portion of the outer surface of the core shaft is formed with knurls.

17 . The actuator of claim 15 , wherein the gap between the core shaft and the center hole is formed by a ventilation groove extending axially along the inner wall surface of the center hole.

18 . The actuator of claim 17 , wherein a ratio of a width of an opening of the ventilation groove in the center hole and a diameter of the center hole ranges from 0.1 to 0.5.

19 . The actuator of claim 11 , wherein a ratio of a diameter of the core shaft to a diameter of the support shaft ranges from 0.1 to 0.75.

Assignees

• Johnson Electric Sa

Inventors

• Chang Harry Hang Fung
• Mao Wei Xing
• Yang Yong Jun
• Yang Ming

Classifications

• F16H57/031

  characterised by covers or lids for gearboxes · CPC title

• F16H2057/0213

  Support of worm gear shafts · CPC title

• E05F15/697

  Motor units therefor, e.g. geared motors · CPC title

• F16H57/027

  characterised by means for venting gearboxes, e.g. air breathers · CPC title

• F16H1/16

  comprising worm and worm-wheel · CPC title