EP1671003A1 - Power actuator for automotive closure latch - Google Patents
Power actuator for automotive closure latchInfo
- Publication number
- EP1671003A1 EP1671003A1 EP04761760A EP04761760A EP1671003A1 EP 1671003 A1 EP1671003 A1 EP 1671003A1 EP 04761760 A EP04761760 A EP 04761760A EP 04761760 A EP04761760 A EP 04761760A EP 1671003 A1 EP1671003 A1 EP 1671003A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- gear
- worm
- motor
- latch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B81/00—Power-actuated vehicle locks
- E05B81/24—Power-actuated vehicle locks characterised by constructional features of the actuator or the power transmission
- E05B81/25—Actuators mounted separately from the lock and controlling the lock functions through mechanical connections
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B81/00—Power-actuated vehicle locks
- E05B81/24—Power-actuated vehicle locks characterised by constructional features of the actuator or the power transmission
- E05B81/50—Powered actuators with automatic return to the neutral position by non-powered means, e.g. by springs
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B81/00—Power-actuated vehicle locks
- E05B81/12—Power-actuated vehicle locks characterised by the function or purpose of the powered actuators
- E05B81/14—Power-actuated vehicle locks characterised by the function or purpose of the powered actuators operating on bolt detents, e.g. for unlatching the bolt
Definitions
- This invention generally relates to power actuators for vehicle latches, as for example to a power actuator for releasing a trunk latch or a power actuator for moving a lock lever between a locking and unlocking position.
- Cost is an important factor for manufacturing vehicle accessories such as motorized latch release devices.
- the number of parts which compose a power actuator has a bearing on the cost of the product.
- known power actuators for automotive closure latches have more parts, and thus likely higher cost, than the present invention.
- a power actuator for automotive closure latches has a reduced number of components in comparison to comparable devices currently on the market.
- a power actuator which includes a housing; an electric motor mounted in the housing; a worm operatively coupled to the motor for driving rotation of the worm about an axis in a first rotational direction; a worm gear, in meshing engagement with the worm, and being mounted in the housing for rotation about an axis substantially orthogonal to the worm axis; a camshaft mounted on the worm gear and having a rotation axis coincident with the gear axis, the camshaft having a distal end; and an output arm affixed at the distal end of the camshaft.
- the power actuator may be employed as a latch release device.
- the latch release device includes a housing; an electric motor mounted in the housing; a worm operatively coupled to the motor for driving rotation of the worm about an axis in a first rotational direction; a worm gear, in meshing engagement with the worm, and being mounted in the housing for rotation about an axis substantially orthogonal to the worm axis; a camshaft mounted on the worm gear and having a rotation axis coincident with the gear axis, the camshaft having a distal end extending to the exterior of the housing; and a cam affixed at the exterior end of the camshaft, having a surface for engaging a said latch to move the latch from a closed position to a release position as the gear rotates in a first direction from a first position to a second position when driven by the motor.
- the worm has a small diameter worm, efficient for the overall size of the device.
- the combination of an output cam with a gear reduction stage results in high overall force output as well.
- the worm gear is biased against the rotation from the first position to the second position.
- the ability to implement a biasing return spring provides repeatable unidirectional force output, and without such a spring, bi-directional torque/force output.
- the device includes electrically conductive contacts embedded into the housing as the housing is molded from plastic resin, to be in electrical contact with the motor and the same time extending to the exterior of the housing for connection to an electric power supply.
- the housing of the latch release device can include an injection- molded closure plate, wherein a hollow portion of the housing and the plate have opposing walls shaped to abut a housing of the motor when the hollow portion and the plate are secured together, and the plate further includes protrusions which extend into the housing interior to abut sides of the motor housing to preclude movement therepast.
- the closure plate and housing include a plurality of holes in communication with each other and located to permit simultaneous fastening of the housing and closure plate together and fastening of the device adjacent a latch with the cam in operable proximity thereto. This arrangement permits utilization of the same fasteners which mount the unit to a host latch or mechanism to also bind the housing components of the device together.
- the preferred embodiment thus provides a highly versatile, customizable, compact, low-cost mechanism for power release or locking.
- Figure 1a is a perspective view of a motorized latch release device of the present invention installed on an automobile, in a closed position;
- Figure 1 b is similar to Figure 1 a in which the motorized latch release device is in an open position;
- Figure 2 is a partially exploded view taken from a vantage point similar to that of the previous figures, having the cover plate of the latch release device removed and partially exploded to reveal the electric motor and worm gear arrangement of the mechanism;
- Figure 3 is a more fully exploded view taken from a vantage point similar to that of the previous figures, to reveal the inner housing, worm wheel and spring for biasing the worm wheel towards the closed position, and the seating area for the motor;
- Figure 4 is a plan type of view of the housing, spring and worm wheel with the worm wheel in the closed position;
- Figure 5 is similar to Figure 4, but with the worm wheel fully rotated into the open position shown in Figure 1 ;
- Figure 6 is
- a motorized latch release device 20 of the present invention is shown generally in Figures 1a and 1b.
- the device is shown installed on an automobile to permit remote-controlled trunk release by a driver.
- the trunk is in the closed and locked position.
- Latch 22, part of a conventional trunk locking mechanism, is biased in the clockwise direction.
- device 20 operates through rotation of an output cam 28 from a closed position shown in Figure 1a to an open position shown in Figure 1b. This counterclockwise rotation (as viewed in Figures 1 a and 1 b) forces latch 22 rightward from its closed position into a release position, as illustrated by the latch positioned in Figure 1b.
- the device includes a hollow housing 30 and a closure plate 32.
- Each of these members is injection-molded as single piece of plastic in a one-step process.
- Integrally molded as part of the housing and affixed within the plastic are electrical connectors, described further below, for connecting an electrical motor 34 of the device to an external power supply.
- the housing and closure are composed of a suitable plastic, in this case a glass and mineral-reinforced nylon resin.
- the polymers are generally selected for high strength and stiffness, dimensional stability and resistance to temperature extremes.
- the electric motor 34 includes an output shaft 36 which drives a worm 38 mounted to the external end of the shaft.
- the device includes a worm gear 40 in meshing engagement with the worm, a helical spring 42, and a cam shaft 44 upon which the output cam 28 is mounted.
- these components are arranged such that the spring biases the worm gear, and hence the output cam, in the counterclockwise direction (as viewed in Figures 1a to 3), towards the closed position.
- the motor operates via the worm to drive the worm gear in the clockwise direction, i.e., towards the open position shown in Figure 1b.
- Electric motor 34 is a high-torque output, low cogging torque 200- series motor with integrated thermal protection, EMC protection and a knurled shaft. Such motors are available, for example, from Mabuchi Motor Co., Ltd. or Johnson Electric North American, Inc.
- the motor is mounted in a fixed position within the housing, being held in place by positive abutment with surfaces of the housing and closure plate.
- a cylindrical stub 48 (see Fig. 7) of the motor is seated against a concave surface 46 of the housing.
- the motor housing abuts directly against first and second surfaces 50, 52.
- closure plate 32 On the inside of closure plate 32 are two rows of triangular protrusions 54 having facing surfaces 56 located and oriented so as to, with inner surface area 58 of the plate, abut against the motor housing.
- Cylindrical stub 60 is received between upstanding members 62, 64 of the inner housing of the device, the side surfaces of each member being in abutment to help hold the shaft end of the motor from moving to the right or left, as oriented in Figure 1.
- the motor includes first and second openings 66, 68 having electrical terminals disposed therein.
- Contact posts 70, 72 are molded into the housing and received within the openings 66, 68 of the motor each in abutting electrical contact with a terminal of the motor.
- the housing includes a socket 74 having first and second prongs 75a, 75b molded externally as part of the rear (as oriented in Figure 1) of the housing.
- Each of the prongs is electrically connected by an embedded conductor to posts 70, 72.
- the socket and prongs are designed to receive a standard plug for supplying electrical power to the motor of the latch release device.
- any suitable form of electrical connector will suffice.
- the drive end of the shaft 36 extends about 1.5 cm beyond the end of cylinder 60 in which it is suitably journaled.
- the free end of the shaft has knurled ridges (not illustrated), parallel to the lengthwise axis of the shaft, pressed into it for a length of about 7 mm.
- the worm 38 is tubular, having an inner diameter slightly less than the outer diameter of shaft 36 so that receipt of the worm onto the shaft results in a snug fit sufficiently tight for the expected life of the device.
- the ridges on the shaft are deformed radially inward slightly during assembly of the worm onto the shaft and the ridges help to ensure that the worm is rigidly affixed to the shaft so as not to rotate with respect to the shaft during operation of the device.
- Worm gear 40 is preferably injection molded in a single step of a homopolymer acetal selected for its low friction, high wear resistance and dimensional stability properties. Alternative materials are possible.
- the gear is molded to include a tubular mounting shaft 80 (see Fig. 7).
- the shaft 80 is received into the open end of a cylindrical mount 82 that is integrally molded in the housing 30.
- Shaft 80 has an external diameter of about 1 cm.
- the diameter of the shaft 80 and the internal diameter of the cylindrical mount 82 are closely dimensioned to each other so that there is very little play between the two pieces, but at the same time the worm gear is free to rotate with respect to the cylindrical mount 82.
- the abutting surfaces are very smooth, of circular cross-section, and present minimal frictional resistance to rotational movement of the gear about the central axis of the shafts.
- the outer diameter of worm gear 40 is about 2.7 cm, and the width of the wheel rim, i.e., the tooth bearing portion of the wheel, is about 1.1 cm, with the total height of wheel shaft 80 being about 1.6 cm.
- a stop 84 is molded as part of the worm gear. The stop 84 protrudes from the toothed rim a distance of about 4 mm and extends around the circumference of the rim a distance of about 45 degrees. This stop can be omitted in the case that full 360 degree output rotation is desired.
- a stop 86, molded as part of the housing, is radially spaced from the center of mount 82 a slightly smaller distance than the radial distance between worm gear stop 84 and the center of shaft 80.
- Housing stop 86 and wheel stop 84 together govern the rotational (angular) distance that the worm wheel is permitted to travel between the closed position ( Figure 1a) and the open position ( Figure 1b), the rotational distance being about 270°.
- the length of the arc on which housing stop 86 lies is about 45° and the length of the arc on which the worm wheel stop 84 lies is about 45° so that together the two stops together extend about 90° along the common circle on which they together lie.
- protrusion 104 Located within the toroidal space is a protrusion 104 which stands out from the gear wall and serves as a catch for hooked end 106 of the spring.
- Protrusion 104 includes overhang 108. By precluding axial movement of the hooked portion of the spring (as in the direction parallel to the central axis of the wheel and away from inner wall 102), overhang 108 aids in the installation of the spring during assembly of the device, and helps to ensure that hook 106 of the spring does not slip past the catch during operation of the device.
- Spring end 110 is in the shape of a hook to latch onto housing surface 96.
- gear stop 84 is generally radially spaced outwardly of spring 42, but that hook 110 protrudes radially outwardly from the remainder of the spring so as to latch onto surface 96, which is itself radially located to abut surface 94 of the stop of the wheel.
- Clearance for travel of stop 84 past hook 110 as the wheel rotates into the closed position is provided by locating the hook in recess 112 which encircles cylindrical mount 82 and extends radially outwardly in the neighborhood of stop 86, as illustrated in Figure 3.
- Hook 110 is thus axially spaced from stop 84 (toward the floor of the housing) to provide for travel of stop 84 past hook 110.
- the spring 42 is installed so as to be under constant tension and is preferably made of spring steel or stainless steel. This results in the worm gear being constantly biased towards the closed position, i.e., in the clockwise direction as viewed in either of Figures 1a or 1b, for example. As the gear is rotated under force provided by the motor through the worm (described in greater detail below), the tension on the spring increases. The motive force of motor 34 is transferred to worm gear 40 by worm 38. Thread 76 of the worm engages teeth 114, which have an axial pitch and lead designed to mesh with the axial pitch and lead of the worm thread.
- the worm gear 40 has a central aperture 116 which receives a shaft 44 attached to cam 28.
- the cam and shaft are injected molded as a single piece of the same type of plastic as the worm gear.
- the exterior profile of the cross- section of shaft 44 matches the cross-section of central aperture 116 of the gear and the cross-sections are non-circular.
- Shaft 44 received into the aperture is thus fixed against rotation with respect to the axis of the worm gear.
- Installed shaft 44 is also centered on the central axis of the worm gear so that when the gear rotates about the axis so too does the cam shaft. It will further be noted that the engagement of surfaces of the shaft 44 and aperture serve to orient the cam for operation between the closed and open positions.
- Cam 28 is installed as part of the device after assembly of the closure and housing, described further below. This is accomplished through tabs 150 at the free end of shaft 44. Each tab is located at the end of finger 152, the fingers being radially spaced apart from each other on opposite sides of the central axis of shaft 44.
- Each tab includes abutment surface 154 which opposes and abuts surface 156 surrounding the central aperture of worm wheel 40.
- Opposing tab surfaces 154 is surface 158 of shaft 44, surface 158 being in abutment with surface 160 of the worm gear.
- the worm gear and affixed cam rotate until the fully open position 28a ( Figure 1b) is reached and motor 34 stalls, which stall leads to the eventual return of the cam to the closed position.
- the cam profile converts the output torque to a linear force pushing against a movable lever, plate or other feature to which one desires a force to be applied.
- This cam functions as a further gear ratio for the system, where smaller distances pushed by the full rotation of the cam are seen to result in higher applied forces by the cam.
- a liquid flow path for such liquids is provided around the periphery of the plate closure edge.
- Ridge 120, molded as part of housing 30, and ridge 122, molded as part of the closure plate 32 are thus shaped to abut against opposing surfaces (of the closure plate and housing, respectively) to provide a limited seal against ingress of water.
- the ridges are spaced slightly inwardly from the extreme periphery so that a liquid flow passage 124 is defined around the periphery of the ridges.
- Housing 30 and closure plate 32 are conveniently assembled together during manufacture of device 20 through a single assembly screw 126 received through plate aperture 128, the screw shaft being received into housing aperture 130.
- Aperture 130 is of smaller cross-section than the shaft of the screw so that the threads of the screw become embedded in the plastic wall of the housing during assembly.
- the housing and plate have a further three pairs of communicating apertures 132, 134, 136. These apertures are used during installation of the device onto the automobile latch by fasteners 138, 140, 142. Areas 144, 146, 148 of the external plate surface surrounding the apertures are in positive abutting contact with surfaces of the automobile when installed.
- the control circuitry for the device may be modified to drive the motor in first and second directions so as to move the cam from the first to the second (nominally open to the closed) positions illustrated in Figures 1a and 1b, respectively, and to move the cam from the second to the first positions.
- the device could thus alternatively be used, for example, to positively move a latch between first and second positions, e.g., a lock lever may be moved between locked and unlocked positions.
- a lock lever may be moved between locked and unlocked positions.
- the cam or other output arm may have a different profile for different applications.
- the illustrated embodiment has been described with particularity for the purposes of description. Those skilled in the art will appreciate that a variety of modifications may be made to the embodiment described herein without departing from the spirit of the invention.
Landscapes
- Lock And Its Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2439780A CA2439780C (en) | 2003-09-08 | 2003-09-08 | Power actuator for automotive closure latch |
PCT/CA2004/001596 WO2005024161A1 (en) | 2003-09-08 | 2004-09-08 | Power actuator for automotive closure latch |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1671003A1 true EP1671003A1 (en) | 2006-06-21 |
EP1671003A4 EP1671003A4 (en) | 2012-08-08 |
EP1671003B1 EP1671003B1 (en) | 2016-12-07 |
Family
ID=36353765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04761760.0A Expired - Fee Related EP1671003B1 (en) | 2003-09-08 | 2004-09-08 | Power actuator for automotive closure latch |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1671003B1 (en) |
CN (1) | CN1846037B (en) |
BR (1) | BRPI0413840A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102400614A (en) * | 2011-11-23 | 2012-04-04 | 上海恩坦华汽车门系统有限公司 | Electric control integrated door lock and bolt actuator for vehicle |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2462116B (en) * | 2008-07-25 | 2012-03-21 | Gm Global Tech Operations Inc | Vehicle side door assembly |
DE102018109477A1 (en) * | 2018-04-20 | 2019-10-24 | Kiekert Ag | Motor vehicle drive arrangement |
WO2020215035A1 (en) * | 2019-04-18 | 2020-10-22 | Inteva Products, Llc | Vehicle latch assembly with interchangeable power release gears for normal or high output latch systems |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5564308A (en) * | 1994-02-26 | 1996-10-15 | Mitsui Kinzoku Kogyo Kabushiki Kaisha | Actuator unit for vehicle door locking device |
US6349983B1 (en) * | 1998-09-21 | 2002-02-26 | Valeo Securite Habitacle | Electric lock for a motor vehicle door |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2542793B1 (en) * | 1983-03-14 | 1985-07-19 | Mecanismes Comp Ind De | LOCK WITH ELECTRIC OPENING, PARTICULARLY FOR MOTOR VEHICLE DOORS |
DE3924231A1 (en) * | 1988-07-21 | 1990-02-01 | Aisin Seiki | DEVICE FOR LOCKING THE DOOR |
US5684281A (en) * | 1996-05-28 | 1997-11-04 | Emerson Electric Co. | Timer camstack and clutch |
CN2290671Y (en) * | 1996-03-20 | 1998-09-09 | 张树和 | Rainproof case of padlock |
DE10164829B4 (en) * | 2001-01-02 | 2006-07-13 | Brose Schließsysteme GmbH & Co.KG | Motor vehicle door lock, designed as an electric lock |
-
2004
- 2004-09-08 EP EP04761760.0A patent/EP1671003B1/en not_active Expired - Fee Related
- 2004-09-08 BR BRPI0413840-6A patent/BRPI0413840A/en not_active IP Right Cessation
- 2004-09-08 CN CN2004800256116A patent/CN1846037B/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5564308A (en) * | 1994-02-26 | 1996-10-15 | Mitsui Kinzoku Kogyo Kabushiki Kaisha | Actuator unit for vehicle door locking device |
US6349983B1 (en) * | 1998-09-21 | 2002-02-26 | Valeo Securite Habitacle | Electric lock for a motor vehicle door |
Non-Patent Citations (1)
Title |
---|
See also references of WO2005024161A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102400614A (en) * | 2011-11-23 | 2012-04-04 | 上海恩坦华汽车门系统有限公司 | Electric control integrated door lock and bolt actuator for vehicle |
Also Published As
Publication number | Publication date |
---|---|
CN1846037A (en) | 2006-10-11 |
BRPI0413840A (en) | 2006-10-24 |
CN1846037B (en) | 2010-09-01 |
EP1671003B1 (en) | 2016-12-07 |
EP1671003A4 (en) | 2012-08-08 |
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