Window lift drive

An electrical window lift drive especially for use in a motor vehicle, comprising:

• a drive housing including first and second parts;
• an electric motor rigidly attached to said first housing part and having a shaft extending into the interior of said housing;
• a worm gear mounted on the motor shaft for rotation thereby;
• an annular collar formed in said first housing part and protruding into the interior of said drive housing;
• a bearing shaft extending inside said housing transversely of the motor shaft and coaxially with said annular collar, said bearing shaft extending through said collar;
• a bearing bushing pressed into the interior surface of said collar, said bearing shaft being movably contained within said bushing;
• a worm wheel mounted for independent rotation on said bearing bushing coaxially with respect to a first portion of said bearing shaft inside said housing, said worm wheel meshing with and being driven by said worm gear;
• a drive member mounted coaxially with respect to a second portion of said bearing shaft, said drive member being in the form of a cable drum rotatably mounted on a bearing bushing carried on an inwardly protruding bearing collar of said second housing part coaxially with respect to said bearing shaft;
• and
• means intermediate said worm wheel and said drive member transferring rotary motion of said worm wheel to said drive member.

An electrical window lift drive especially for use in a motor vehicle, comprising:

• a drive housing comprising first and second parts;
• an electric motor rigidly attached to the first part of said housing and having a shaft extending into the interior of said housing;
• a worm gear mounted on the motor shaft for rotation thereby;
• a worm wheel mounted for independent rotation coaxially with respect to a first portion of a bearing shaft and on support means independent of said bearing shaft intermediate said shaft and said wheel, said worm wheel meshing with and being driven by said worm gear and said bearing shaft being non-rotatably supported in said housing on both sides of said worm wheel;
• an annular collar formed in said first housing part and protruding into the interior of said drive housing coaxially with respect to said bearing shaft, said bearing shaft extending through said collar, said means intermediate said shaft and said wheel being a portion of the outer surface of said collar protruding inwardly of the housing and said worm wheel being directly mounted for rotation thereon;
• a drive member mounted coaxially with respect to a second portion of said bearing shaft, said drive member being a pinion mounted for rotation directly on the second portion of said bearing shaft for driving a leverage lift system, said pinion having an outer surface, a hub portion of which is rotatably mounted in a bearing aperture in said second housing part and said second housing part includes a cylindrical section wall forming a chamber containing a portion of said pinion inside the housing;
• means intermediate said worm wheel and said drive member transferring rotary motion of said worm wheel to said drive member, said means intermediate said worm gear and said drive member including at least one arm attached to said pinion extending radially outwardly from the pinion hub portion inside the housing;
• a protrusion at the distal end of the arm extending in the axial direction of said collar within the chamber;
• at least one recess in said worm wheel with opening facing axially in the direction of said pinion;
• a hub in the form of a collar on said worm wheel extending axially in the direction of and to a point adjacent said pinion;
• a jaw clutch rotatably mounted on the outer surface of said worm wheel hub, the body of said jaw clutch being generally intermediate the main body portions of said pinion and said worm wheel;
• at least one arm extending radially outwardly on said jaw clutch;
• oppositely directed protrusions extending axially in both directions from the distal end of said jaw clutch arm, the protrusion extending in the direction of said worm wheel engaging said recess in said worm wheel, and the protrusion directed toward said pinion extending into the chamber to coact with the protrusion of said pinion;
• a loop spring brake located radially between said cylindrical housing section wall and the pinion and jaw clutch protrusions in the chamber, said loop spring brake rotatively connecting said protrusions and being biased radially outwardly toward said cylindrical housing section wall, said loop spring brake expanding against said cylindrical section wall to resist any rotative movement tending to occur when back forces on the pinion urge rotation thereof and said brake being released from engagement with said cylindrical housing section wall to effectively couple the worm wheel for rotation with the jaw clutch when the driving forces come from said worm wheel.