US20020096905A1 - Torsion bar for a door lid - Google Patents

Torsion bar for a door lid Download PDF

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Publication number
US20020096905A1
US20020096905A1 US09/766,282 US76628201A US2002096905A1 US 20020096905 A1 US20020096905 A1 US 20020096905A1 US 76628201 A US76628201 A US 76628201A US 2002096905 A1 US2002096905 A1 US 2002096905A1
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Prior art keywords
torsion bar
portions
pair
lifting
extender
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Granted
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US09/766,282
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US6419293B1 (en
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Nicole Nicholas
Anita Arora
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Toyota Motor Corp
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Individual
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Priority to US09/766,282 priority Critical patent/US6419293B1/en
Assigned to TOYOTA TECHNICAL CENTER USA, INC. reassignment TOYOTA TECHNICAL CENTER USA, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARORA, ANITA
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Publication of US6419293B1 publication Critical patent/US6419293B1/en
Publication of US20020096905A1 publication Critical patent/US20020096905A1/en
Assigned to TOYOTA TECHNICAL CENTER USA, INC. reassignment TOYOTA TECHNICAL CENTER USA, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TOYOTA TECHNICAL CENTER USA, INC.
Assigned to TOYOTA MOTOR CORPORATION reassignment TOYOTA MOTOR CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TOYOTA TECHNICAL CENTER USA, INC.
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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
    • E05F1/08—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings
    • E05F1/10—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance
    • E05F1/12—Mechanisms in the shape of hinges or pivots, operated by springs
    • E05F1/123—Mechanisms in the shape of hinges or pivots, operated by springs with a torsion bar
    • E05F1/1238—Mechanisms in the shape of hinges or pivots, operated by springs with a torsion bar specially adapted for vehicles
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
    • E05F1/08—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings
    • E05F1/10—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance
    • E05F1/1033—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a torsion bar
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/14—Torsion springs consisting of bars or tubes

Definitions

  • the present invention relates to a torsion bar and, more particularly, to a torsion bar for use in raising a door lid.
  • Torsion bars have been used in assisting in the opening and raising doors and lids of vehicles.
  • the torsion bar has at least two radially extending U-shaped portions. These portions are typically formed by bending the bar. When the door is open, one of the radially extending portions contacts the underside of the door and the other radially extending portion contacts the structure adjacent the door. When the door is closed, it pushes one of the radially extending portions towards the other, twisting the rod and creating a spring-like tension in the rod.
  • Japanese Publication 2875027 discloses a torsion bar formed to raise the engine cover of a forklift truck.
  • the torsion bar has a door lid lifting portion extending radially outwardly from the bar adjacent each of a pair of hinges.
  • a center portion extends in a radially opposite direction to abut the inside of the engine compartment.
  • the door lid arm portions are twisted towards the center arm to create a torsion in the torsion bar acting in opposition to the closure. If the weight of the lid is greater than the biasing force of the torsion bar, the engine lid will remain in the closed position.
  • the biasing force of the torsion bar assists in raising the lid and holding the lid in the open position.
  • torsion bars It is also known to use torsion bars to open trunk lids and hoods in automobiles.
  • a door lifting mechanism It is desirable to provide a “pop-up” force to raise the trunk lid a short distance from its locked position without any outside assistance. It is also desirable to provide a “hold open” force which will support the door in any position where it is placed. It is desirable to have this force for use between the “pop-up” position and the approximately sufficient force to hold the door open in its fully extended position.
  • the torsion bar provide sufficient force to support in intermediate positions in between the pop-up position and the midway open position.
  • the door should be forced to and held at the fully open position when raised by a person beyond the midway position.
  • the torsion bar must have a large enough moment to open and support the door in this range of operation.
  • the invention relates to a torsion bar having an effective additional length.
  • the effective additional length permits the torsion bar to produce a greater torsion bar moment without exceeding the design stress.
  • the torsion bar includes a length extender portion disposed between a pair of radially extending lifting portions.
  • the length extender portion is formed by bending a center portion of the rod into a shape. The shape will depend on the space available to accept the extender portion. In this way the effective length of the torsion bar is increased by the length of the extender portion thereby providing the desired “pop opening” force, “holding” force and moment to support the trunk lid in the “hold open” position.
  • FIG. 1 is a perspective view of a vehicle and vehicle trunk lid with a torsion bar in accordance with the invention supporting the trunk lid;
  • FIG. 2 is a side view of the trunk lid and hinge mechanism
  • FIG. 3 is a top view of the torsion bar and the hinge mechanism in position in a vehicle in accordance with the invention.
  • FIG. 4 is a partial perspective view of a hinge assembly in accordance with the invention.
  • FIG. 1 A novel torsion bar 10 for opening a trunk lid 12 for a luggage compartment 14 of a vehicle 16 is shown in FIG. 1.
  • the trunk lid 12 is movably supported by hinges 18 as shown in FIGS. 2 and 4.
  • each hinge 18 includes a hinge arm 20 which slides through an aperture 22 .
  • the trunk lid 12 moves with the hinge arm 20 in a hinge support 24 between a closed position “A” and an open position “B”.
  • the hinge support 24 is mounted within the luggage compartment 14 .
  • a pin 28 holds the hinge arm 20 from sliding through the aperture 22 in the hinge support 24 .
  • a link 26 extends between the hinge arm 20 and a lifting portion 30 of the torsion bar 10 .
  • One end of the link 26 is attached by a pin 32 to the hinge arm 20 .
  • the other end of the link 26 has a notch 34 to accept the lifting portion 30 of torsion bar 10 .
  • the link 26 twists the torsion bar 10 as the trunk lid is closed (FIG. 2).
  • the torsion bar 10 is mounted to extend transversely across the vehicle beneath a rear deck 36 .
  • the torsion bar 10 is roughly formed in a single piece of ASTM 8227 or SAE 9254 or similar material.
  • the torsion bar 10 has an extender portion 38 centrally disposed between a pair of rod portions 40 and the lifting portions 30 .
  • Each lifting portion 30 is adjacent an end of the torsion bar 10 and displaced angularly approximately 60° from the center portion which extends along a horizontal plane when installed.
  • the torsion bar is bent into shape from a single rod.
  • the torsion bar could be formed by welding one or more segments together.
  • each lifting portion 30 is firmed by bending into a generally U-shape.
  • a transverse portion 42 engaging the link 26 and extends between a pair of radially extending arms 44 for engaging the link 26 to assist in raising the trunk lid 12 .
  • the rod portions 40 extend between the lifting portions 30 and the extender portion 38 .
  • the rod portions 40 may be bowed or curved to accommodate the placement of rear speakers 46 in the rear deck 36 as shown in FIG. 3.
  • the torsion bar 10 is bent approximately 180° at an inner end of each of the rod portions to the extender portion 38 .
  • the extender portion 38 extends on a horizontal plane along a longitudinal axis which is parallel with a longitudinal axis of a vehicle.
  • the extender portion has a center portion 50 extending along the longitudinal axis between a pair of transverse portions 48 which extend in opposite directions along an axis which extends transversely across the vehicle.
  • the center portion 50 and transverse portions 48 are formed as in an inverted U-shape with the openings adjacent each other.
  • a bracket 52 is mounted beneath the rear deck 36 of the luggage compartment 14 to hold the torsion bar 10 .
  • the bracket 52 has a hook portion which engages the center portion 50 of torsion bar 10 .
  • the length of the extender portion 38 is chosen to provide the torsion bar 10 with the desired overall length to provide the desired torsion. In the preferred embodiment, the length of the torsion bar between the lifting portions 30 is approximately 150-200% of the distance between the hinge supports 24 .
  • the trunk lid and torsion bar are installed in the vehicle in the normal fashion.
  • the hinge is mounted first and then the trunk lid is mounted to the hinge.
  • the torsion bar 10 is then mounted in the vehicle.
  • the lifting portions 30 of the torsion bar 10 are placed in the notches 34 of the links 26 .
  • the transverse portion of the center portion 50 is snapped into the hook portion of the bracket 52 .
  • the links 26 displace the lifting portions 30 in an arc toward the front of the vehicle 16 .
  • the displacement of the lifting portions 30 during closing twists the torsion rod 10 to develop a lifting force.
  • the lifting force length of the torsion bar 10 has been increased by the extender portion 38 so that the torsion bar 10 provides sufficient “pop up” force and holding force while not overstressing the torsion bar 10 .
  • the torsion bar 10 effectively meets the desired lifting criteria.

Abstract

A torsion bar for use in raising a vehicle trunk lid has a center extender portion to increase the effective length of the torsion bar. The extender portion generally includes three U-shaped portions of the torsion bar which extend on a generally horizontal plane. Two of the U-shaped portions extend transversely across the vehicle. The third extends longitudinally. A pair of lifting portions extend radially at either end of the torsion bar. The lifting portions engage a link pivotally attached to hinge arms to form a biasing force to lift the trunk lid. The increased effective length of the torsion bar permits the torsion bar to produce desired lifting criteria while preventing the torsion bar from being overstressed.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0001]
  • The present invention relates to a torsion bar and, more particularly, to a torsion bar for use in raising a door lid. [0002]
  • 2. Description of the Prior Art [0003]
  • Torsion bars have been used in assisting in the opening and raising doors and lids of vehicles. Typically, the torsion bar has at least two radially extending U-shaped portions. These portions are typically formed by bending the bar. When the door is open, one of the radially extending portions contacts the underside of the door and the other radially extending portion contacts the structure adjacent the door. When the door is closed, it pushes one of the radially extending portions towards the other, twisting the rod and creating a spring-like tension in the rod. [0004]
  • Japanese Publication 2875027 discloses a torsion bar formed to raise the engine cover of a forklift truck. The torsion bar has a door lid lifting portion extending radially outwardly from the bar adjacent each of a pair of hinges. A center portion extends in a radially opposite direction to abut the inside of the engine compartment. When the engine cover lid is closed, the door lid arm portions are twisted towards the center arm to create a torsion in the torsion bar acting in opposition to the closure. If the weight of the lid is greater than the biasing force of the torsion bar, the engine lid will remain in the closed position. When the engine cover is lifted to access the compartment, the biasing force of the torsion bar assists in raising the lid and holding the lid in the open position. [0005]
  • It is also known to use torsion bars to open trunk lids and hoods in automobiles. However, there are a number of parameters which are desirable in designing a door lifting mechanism. It is desirable to provide a “pop-up” force to raise the trunk lid a short distance from its locked position without any outside assistance. It is also desirable to provide a “hold open” force which will support the door in any position where it is placed. It is desirable to have this force for use between the “pop-up” position and the approximately sufficient force to hold the door open in its fully extended position. In some cases, it is desirable that the torsion bar provide sufficient force to support in intermediate positions in between the pop-up position and the midway open position. Finally, the door should be forced to and held at the fully open position when raised by a person beyond the midway position. Thus, the torsion bar must have a large enough moment to open and support the door in this range of operation. [0006]
  • It has been difficult to find a good combination of all the variables to meet these design parameters. The length of typical torsion bars is such that these bars do not provide sufficient “hold open” force to support the door at the intermediate positions. Accordingly, it is known to use a pair of torsion bars such as disclosed in Japanese Patent No. 55-94278. Each bar has a radially extending portion which is positioned against one of the hinge links. The torsion bars are then mounted to cross each other. However, such an installation is costly to build and install. Accordingly, it would be desirable to have a single torsion bar which met the necessary design parameters and reduces the mass and cost of production. [0007]
    • SUMMARY OF THE INVENTION
  • The invention relates to a torsion bar having an effective additional length. The effective additional length permits the torsion bar to produce a greater torsion bar moment without exceeding the design stress. The torsion bar includes a length extender portion disposed between a pair of radially extending lifting portions. In the preferred embodiment, the length extender portion is formed by bending a center portion of the rod into a shape. The shape will depend on the space available to accept the extender portion. In this way the effective length of the torsion bar is increased by the length of the extender portion thereby providing the desired “pop opening” force, “holding” force and moment to support the trunk lid in the “hold open” position.[0008]
    • BRIEF DESCRIPTION OF THE DRAWING
  • Reference is made to the attached drawing of the present invention wherein reference numerals and description refer to like parts throughout the several views and in which: [0009]
  • FIG. 1 is a perspective view of a vehicle and vehicle trunk lid with a torsion bar in accordance with the invention supporting the trunk lid; [0010]
  • FIG. 2 is a side view of the trunk lid and hinge mechanism; [0011]
  • FIG. 3 is a top view of the torsion bar and the hinge mechanism in position in a vehicle in accordance with the invention; and [0012]
  • FIG. 4 is a partial perspective view of a hinge assembly in accordance with the invention.[0013]
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • A [0014] novel torsion bar 10 for opening a trunk lid 12 for a luggage compartment 14 of a vehicle 16 is shown in FIG. 1. The trunk lid 12 is movably supported by hinges 18 as shown in FIGS. 2 and 4. As shown in FIG. 4, each hinge 18 includes a hinge arm 20 which slides through an aperture 22.
  • As shown in FIG. 2, the [0015] trunk lid 12 moves with the hinge arm 20 in a hinge support 24 between a closed position “A” and an open position “B”. The hinge support 24 is mounted within the luggage compartment 14. A pin 28 holds the hinge arm 20 from sliding through the aperture 22 in the hinge support 24. A link 26 extends between the hinge arm 20 and a lifting portion 30 of the torsion bar 10. One end of the link 26 is attached by a pin 32 to the hinge arm 20. The other end of the link 26 has a notch 34 to accept the lifting portion 30 of torsion bar 10. As discussed below, the link 26 twists the torsion bar 10 as the trunk lid is closed (FIG. 2).
  • As shown in FIG. 3, the [0016] torsion bar 10 is mounted to extend transversely across the vehicle beneath a rear deck 36. The torsion bar 10 is roughly formed in a single piece of ASTM 8227 or SAE 9254 or similar material. The torsion bar 10 has an extender portion 38 centrally disposed between a pair of rod portions 40 and the lifting portions 30. Each lifting portion 30 is adjacent an end of the torsion bar 10 and displaced angularly approximately 60° from the center portion which extends along a horizontal plane when installed. In the preferred embodiment, the torsion bar is bent into shape from a single rod. However, the torsion bar could be formed by welding one or more segments together.
  • As shown in FIG. 3, each [0017] lifting portion 30 is firmed by bending into a generally U-shape. A transverse portion 42 engaging the link 26 and extends between a pair of radially extending arms 44 for engaging the link 26 to assist in raising the trunk lid 12. The rod portions 40 extend between the lifting portions 30 and the extender portion 38. The rod portions 40 may be bowed or curved to accommodate the placement of rear speakers 46 in the rear deck 36 as shown in FIG. 3.
  • The [0018] torsion bar 10 is bent approximately 180° at an inner end of each of the rod portions to the extender portion 38. The extender portion 38 extends on a horizontal plane along a longitudinal axis which is parallel with a longitudinal axis of a vehicle. In the preferred embodiment, the extender portion has a center portion 50 extending along the longitudinal axis between a pair of transverse portions 48 which extend in opposite directions along an axis which extends transversely across the vehicle. The center portion 50 and transverse portions 48 are formed as in an inverted U-shape with the openings adjacent each other.
  • A [0019] bracket 52 is mounted beneath the rear deck 36 of the luggage compartment 14 to hold the torsion bar 10. The bracket 52 has a hook portion which engages the center portion 50 of torsion bar 10. The length of the extender portion 38 is chosen to provide the torsion bar 10 with the desired overall length to provide the desired torsion. In the preferred embodiment, the length of the torsion bar between the lifting portions 30 is approximately 150-200% of the distance between the hinge supports 24.
    • OPERATION
  • The trunk lid and torsion bar are installed in the vehicle in the normal fashion. The hinge is mounted first and then the trunk lid is mounted to the hinge. The [0020] torsion bar 10 is then mounted in the vehicle. The lifting portions 30 of the torsion bar 10 are placed in the notches 34 of the links 26. The transverse portion of the center portion 50 is snapped into the hook portion of the bracket 52. When the trunk lid 12 is closed, the links 26 displace the lifting portions 30 in an arc toward the front of the vehicle 16.
  • The displacement of the lifting [0021] portions 30 during closing twists the torsion rod 10 to develop a lifting force. The lifting force length of the torsion bar 10 has been increased by the extender portion 38 so that the torsion bar 10 provides sufficient “pop up” force and holding force while not overstressing the torsion bar 10. The torsion bar 10 effectively meets the desired lifting criteria.
  • The discussion and examples hereinabove represent a specific embodiment of applications of the present invention. Within the guidelines given herein, one of skill in the art could readily recognize variations of the invention. Therefore, it is to be understood that the foregoing discussion, description and example are illustrative of a particular embodiment of the present invention but are not meant to be limitations upon the practice thereof. It is the following claims, including all equivalents, which define the scope of the invention.[0022]

Claims (7)

We claim:
1. A torsion bar for use in combination with a door and a pair of hinge assemblies, said torsion bar comprising:
an extender portion and a pair of lifting portions spaced apart a predetermined distance, said torsion bar further having a pair of rod portions, each of said rod portions extending from one of said lifting portions towards said extender portion, said extender portion having a longitudinal axis extending transversely to a plane extending through said pair of hinge assemblies, said extender portion having at least one portion extending in a direction away from said longitudinal axis, said extender portion and said rod portions having a combined length greater than said predetermined distance between said pair of lifting portions having a lifting portions engaging one of said pair of hinge assemblies to be twisted away from said center portion when said door is closed.
2. The torsion bar of claim 1 wherein said extender portions have a pair of transverse portions connected together by a center portion.
3. The torsion bar of claim 2 wherein said pair of transverse portions have an equal length.
4. The torsion bar of claim 3 wherein each of said pair of transverse portions have a generally U-shape.
5. The torsion bar of claim 1 wherein said center attachment portion has a generally U-shape.
6. The torsion bar of claim 3 wherein said pair of rod portions have a length greater than said transverse portions of said extender portion.
7. A lifting assembly for raising a door with respect to a deck, said lifting assembly comprising:
a pair of hinge assemblies extending between said deck and said door,
a torsion bar having a pair of lifting portions and an extender portion,
said extender portion engaging said deck, each of said pair of lifting portions engaging one of said hinge assemblies, said torsion bar further having at least one rod portion extending between said extender portion and one of said lifting portions, said extender portion having at least one transverse portion extending in a direction away from said center portion.
US09/766,282 2001-01-19 2001-01-19 Torsion bar for a door lid Expired - Fee Related US6419293B1 (en)

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
US20050121934A1 (en) * 2003-12-09 2005-06-09 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Hinged vehicle body part and method of using and making same
US20100275518A1 (en) * 2009-04-28 2010-11-04 Suzuki Motor Corporation Opening and closing device for automobile trunk lid
US20110285166A1 (en) * 2010-05-24 2011-11-24 Johnan Manufacturing Inc. Lid opening and closing apparatus
US8469433B2 (en) * 2011-07-20 2013-06-25 GM Global Technology Operations LLC Decklid hinge counterbalance assembly having a straight-end torque rod
US20140298617A1 (en) * 2013-04-09 2014-10-09 GM Global Technology Operations LLC Vehicle and a hinge assembly for a storage compartment of the vehicle

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US6736440B1 (en) * 2002-12-17 2004-05-18 General Motors Corporation Decklid hinge for vehicle
GB2396397A (en) * 2002-12-20 2004-06-23 Gencorp Property Inc A spring assembly including at least one torsion bar for controlling the movement of closure members
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KR100896908B1 (en) 2008-05-09 2009-05-12 현대자동차주식회사 Torsion bar of trunk for vehicle
JP5265011B2 (en) * 2008-09-04 2013-08-14 アウディ アクチェンゲゼルシャフト Automobile with mechanism to move flap or door
DE102010023971B3 (en) * 2010-06-16 2011-12-08 Audi Ag Method for installing a device for spring-assisted pivoting of a flap or door in a vehicle
WO2014034553A1 (en) * 2012-08-30 2014-03-06 本田技研工業株式会社 Opening-closing device for opening in vehicle
US10246920B2 (en) 2016-06-08 2019-04-02 Fca Us Llc Torsion rod loading device and assembly
CN110621569B (en) * 2017-06-19 2022-05-27 尼特固有限公司 Rear trunk lid stopper mechanism and method for controlling rotational motion of rear trunk lid
KR20200039257A (en) * 2018-10-05 2020-04-16 현대자동차주식회사 Open and close control device of trunk
US11230868B2 (en) * 2019-10-29 2022-01-25 Nissan North America, Inc. Torque rod for closure panel of vehicle

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Publication number Priority date Publication date Assignee Title
US20050121934A1 (en) * 2003-12-09 2005-06-09 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Hinged vehicle body part and method of using and making same
US7188884B2 (en) * 2003-12-09 2007-03-13 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Hinged vehicle body part and method of using and making same
US20100275518A1 (en) * 2009-04-28 2010-11-04 Suzuki Motor Corporation Opening and closing device for automobile trunk lid
US8251431B2 (en) * 2009-04-28 2012-08-28 Suzuki Motor Corporation Opening and closing device for automobile trunk lid
US20110285166A1 (en) * 2010-05-24 2011-11-24 Johnan Manufacturing Inc. Lid opening and closing apparatus
US8419106B2 (en) * 2010-05-24 2013-04-16 Johnan Manufacturing Inc. Lid opening and closing apparatus
US8469433B2 (en) * 2011-07-20 2013-06-25 GM Global Technology Operations LLC Decklid hinge counterbalance assembly having a straight-end torque rod
US20140298617A1 (en) * 2013-04-09 2014-10-09 GM Global Technology Operations LLC Vehicle and a hinge assembly for a storage compartment of the vehicle
US8863359B1 (en) * 2013-04-09 2014-10-21 GM Global Technology Operations LLC Vehicle and a hinge assembly for a storage compartment of the vehicle

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