WO2004018243A2 - Controlled truck cab suspension - Google Patents

Controlled truck cab suspension Download PDF

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Publication number
WO2004018243A2
WO2004018243A2 PCT/US2003/026320 US0326320W WO2004018243A2 WO 2004018243 A2 WO2004018243 A2 WO 2004018243A2 US 0326320 W US0326320 W US 0326320W WO 2004018243 A2 WO2004018243 A2 WO 2004018243A2
Authority
WO
WIPO (PCT)
Prior art keywords
suspension system
cab
strut
frame
strat
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.)
Ceased
Application number
PCT/US2003/026320
Other languages
French (fr)
Other versions
WO2004018243A3 (en
Inventor
Michael L. Oliver
William C. Kruckemeyer
Eric L. Jensen
Todd A. Bishop
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Priority to AU2003262787A priority Critical patent/AU2003262787A1/en
Publication of WO2004018243A2 publication Critical patent/WO2004018243A2/en
Publication of WO2004018243A3 publication Critical patent/WO2004018243A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D33/00—Superstructures for load-carrying vehicles
    • B62D33/06—Drivers' cabs
    • B62D33/0604—Cabs insulated against vibrations or noise, e.g. with elastic suspension
    • B62D33/0608—Cabs insulated against vibrations or noise, e.g. with elastic suspension pneumatic or hydraulic suspension
    • 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
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
    • 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
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
    • F16F15/027—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means comprising control arrangements
    • F16F15/0275—Control of stiffness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/30—Spring/Damper and/or actuator Units
    • B60G2202/31—Spring/Damper and/or actuator Units with the spring arranged around the damper, e.g. MacPherson strut
    • B60G2202/314—The spring being a pneumatic spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/126—Mounting of pneumatic springs
    • B60G2204/1262—Mounting of pneumatic springs on a damper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/128—Damper mount on vehicle body or chassis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/16—Mounting of vehicle body on chassis
    • B60G2204/162—Cabins, e.g. for trucks, tractors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/20—Mounting of accessories, e.g. pump, compressor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/43—Fittings, brackets or knuckles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/011—Modular constructions
    • B60G2206/0116—Integrated distribution control units with valves, accumulators, PCB's or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/40—Constructional features of dampers and/or springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/25—Stroke; Height; Displacement
    • B60G2400/252—Stroke; Height; Displacement vertical
    • 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
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/54—Arrangements for attachment

Definitions

  • the present invention relates to the field of suspension systems to isolate vibration and, more particularly, to suspension systems for truck cabs and the like.
  • a typical prior art suspension system is adapted to interconnect a truck cab 12 and an associated truck frame 14.
  • the frame 14 typically includes rails 16, 18 joined by a transverse frame element 20.
  • the forward portion 22 of the cab 12 is mounted on the frame 14 by bushings 24, 26.
  • Bushings 24, 26 provide a flexible attachment for the front 22, while controlling relative fore and aft cab movement, as well as restricting lateral movement of the cab 12 relative to the frame 14.
  • the rear 28 of the cab 12 is attached to the frame 14 by a system that includes standard shock absorbers 30, 32, a panhard rod or transverse link 34, air springs 36, 38, and a height sensor or air control valve 40.
  • the shock absorbers 30, 32 dampen vertical motion between the rear 28 of the cab 12 and the frame 14, and the panhard rod 34 restricts relative lateral motion between the cab and the frame.
  • the air springs 36, 38 support the rear 28 of the cab 12 above the frame 14 and are selectively pressurized by the air control valve 40, which is connected to a source of pressurized air (not shown), in order to maintain the rear 28 of the cab 12 a predetermined distance above the frame 14 in response to varying loads in the cab.
  • a disadvantage with such prior art systems as the suspension system 10 shown in Figs. 1-3 is that such systems are overly complex, relatively expensive and occupy a relatively large amount of space beneath the cab and between the rails of the associated frame. Accordingly, there is a need for a suspension system for a truck cab that minimizes the components required to perform the suspension and shock absorbing function, provides lateral support and shock damping features, and at the same time minimizes the space required in the area between the cab and frame rales. There is also a need for a cab suspension system that controls cab ride height and provides an improved ride.
  • the present invention is a controlled suspension system, preferably for use between a truck cab and an associated track frame, that includes a strut module having an air sleeve that is capable of being selectively pressurized, a height sensor for measuring a distance between a truck cab and associated truck frame and a controller for receiving a signal from the height sensor and selectively pressurizing the air sleeve.
  • the strut module is adapted to be mounted between the rear of a truck cab and an associated frame. A signal generated by the height sensor and read by the controller enables the controller to pressurize the air sleeve selectively in order to maintain a predetermined distance between an associated cab and frame to accommodate varying loads within the cab.
  • the strut module also includes a strut, preferably a magnetorheological (MR) McPherson-type strut, that is actuated by the controller to vary the damping characteristics of the strut.
  • the controller as well as the height sensor are mounted on and contained within the strut module so that the number of attachment points required by the system of the present invention to an associated cab and frame is minimized.
  • the strut module includes a flange at an end thereof that provides two points of connection of a three-point connection system. This three-point connection system is arranged to restrict relative lateral movement between the cab and frame, thereby eliminating the need of the panhard rod or equivalent structure required by prior art suspension systems, such as that shown in Figs. 1-3.
  • Another advantage of the preferred embodiment is that the controller controls the MR damper to provide an improved ride over prior art, non-adjustable dampers.
  • the air sleeve is concentric with and extends about the strut, incorporating the inner and outer strut tubes to define the pressurized chamber of the air sleeve.
  • the resulting strut module is more compact and therefore requires less space than prior art suspension systems. As a result, space between the cab and frame available for other vehicle components is increased.
  • Fig. 1 is a schematic, rear perspective view of a vehicle cab and frame showing a prior art suspension system
  • Fig. 2 is a detail of the prior art suspension system shown in Fig. 1;
  • Fig. 3 is a schematic, perspective view of the suspension system of Fig. 1, taken from the side;
  • Figs. 4 A, 4B and 4C are perspective views of the suspension system of the present invention;
  • Fig. 5 is a schematic, rear perspective view of a truck cab and frame incorporating the suspension system of Figs. 4A-4C;
  • Fig. 6 is a detail of Fig. 5 showing the connection of the suspension system of Figs. 4A-4C to a truck cab and frame;
  • Fig. 7 is a side elevational view of the strut module of the present invention.
  • Fig. 8 is a cross-section taken at line 8-8 of Fig. 7;
  • Fig. 9 is a detail side elevation in section of the strut module of Fig. 8.
  • Fig. 10 is a cross-section taken at line 10-10 of Fig. 9.
  • the suspension system of the present invention is shown in Figs. 4A, 4B and 4C.
  • the suspension system 50 includes a strut module 52 that includes a strut 54, air sleeve 56 and a controller 58 of conventional design. Controller 58 is connected to receive a signal from a height sensor 60.
  • the controller 58 preferably is integral with the height sensor 60.
  • the strut module 52 also includes a double flange 62 having resilient connection points 64, 66 spaced on either side of the strut module. Together with connection point 68, connection points 64, 66 constitute a three-point connection between a cab and associated frame.
  • connection points 64, 66, 68 includes a tubular sleeve 70, resilient bushmg 72 and inner, elongated sleeve 74.
  • Each of the connection points 64, 66, 68 is adapted to be attached either to the cab 12 or frame 14 by bolts 76, 78, 80 (see Fig. 6).
  • the height sensor 60 is of conventional design and includes a link 82 that is connected at an end 84 to the end 86 of the strut 54. As a result, movement of the strat 54 causes the height sensor 60 to detect a change in the spacing between the associated cab 12 and frame 14 (see Fig. 6). Accordingly, there is no need for separate connections between the suspension system 50 and the associated vehicle other than the three-point connections 64, 66, 68 of the strut module 52.
  • the strut module 52 is mounted on a flange 88 at its upper end and to the transverse frame element 20 of associated truck frame 14 at its lower end.
  • the flange 88 is, in turn, attached to the rear 28 of the cab 12.
  • the three-point connection 64, 66, 68 provides a resistance to relative lateral movement between the cab 12 and frame 14.
  • the strat module 52 is connected to the flange 88 by bolts 76, 78, and to transverse frame element 20 by bolt 80. Since the height sensor 60 is integral with the , strat module 52, there is no need for additional connections between the suspension system 50 and the associated cab 12 and frame 14.
  • the details of the strut module 52 are shown in Figs. 7 and 8.
  • the strat module 52 includes a strut 54, which preferably is an MR McPherson-type strat such as that disclosed in U.S. Pat. No. 6,345,706, the disclosure of which is incorporated herein by reference.
  • Strut 54 includes an inner tube 90, an outer tube 92 and a bearing sleeve 94.
  • the bearing sleeve 94 provides and interface between the inner and outer tubes 90, 92, respectively, that distributes bending moments applied to the ends of the strat 54.
  • the inner tube 90 includes an inner rod 96 that is connected to a piston (not shown). The end of the inner rod 96 is threaded and receives a nut 98 and captures a strat base 100.
  • a plug housing 102 is attached to the end of the strut base 100 and is connected to the controller 58 by a cable (not shown).
  • the air sleeve 52 is shown in Figs. 7 and 8 and includes a tube 104 connected to an end plate 106 that, in turn, forms a seal with the inner tube 90 by means of a seal element 108, preferably an O-ring.
  • the tube 104 is connected to a flexible sleeve 110 by a retaining ring 112.
  • the flexible sleeve 110 is attached at its opposite end to the outer tube 92 by retaining ring 114.
  • a fitting 116 is connected to a conduit 118 (see Figs. 4A-4C) that is connected to the controller 58.
  • the controller 58 includes a fitting 120 that connects to a source of pressurized air (not shown) and a fitting 122 that connects to a source of electrical power (not shown).
  • a primary air chamber 124 is formed by inner tube 90, end plate 108, flexible sleeve 110 and outer tube 92.
  • a secondary air chamber 126 can be formed, as shown in Figs. 8, 9 and 10.
  • the secondary air chamber 126 is defined by outer tube 92, inner tube 90 and a seal adapter 128.
  • the seal adapter 128 includes a central hole 130 that receives the end of the inner rod 96 and is shaped to receive a seal element, such as an O- ring 132, and a retaining ring 134.
  • An O-ring 136 provides a seal between the seal adapter 128 and the outer tube 92.
  • the seal adapter 128 is shaped to engage the strut base 98.
  • the seal adapter 128 includes an anti-rotation projection (shown as flats 130) that mates with corresponding flats 132 formed in the strat base 98. This allows the nut 100 that retains the end of the inner rod 96 to be tightened without rotating the inner rod. Additionally, it may be necessary to provide an air flow groove at 134 (see Fig. 8) to provide a pneumatic connection between primary chamber 124 and secondary chamber 126.
  • the relative position between the inner tube 90 and the outer tube 92 of the strat 54 is detected by the height sensor 60, which generates a signal to the controller 58.
  • the controller 58 pressurizes the primary and secondary air chambers 124, 126, respectively, to maintain the spacing between the cab 12 and frame 14 within predetermined limits. This pressurization would result from a change in the weight or load present in the cab 12.
  • the controller 58 generates an electrical signal to plug housing 102 that is transmitted through the inner rod 96 to adjust the damping characteristics of the MR strat 54.
  • suspension system 50 of the present invention may be used to support vehicle cabs and other enclosures above both stationary and vehicular support frames, as well as above framework for marine vessels.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Vehicle Body Suspensions (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

A suspension system for use between a cab (12) and an associated truck frame (14), including a strut module having a strut (52, 54), an air spring and a control module (58). The control module (58) connected to a source of pressurized air, is integral with the strut (52, 54) and includes a height sensor (60) for sensing a distance between the cab (16) and truck frame (14). The integral control module selectively pressurizes the air spring in response to changes in that distance. Preferably, the strut (52, 54) is magnetorheological, McPherson strut and the air spring (100) encloses at least a portion of the strut (52, 54) to provide a compact assembly. The strut damping characteristics are aired by the control module to provide optimize rider characteristic. The strut module includes a three-point connection to the cab and frame to resist relative lateral movement between the cab (12) and frame (14).

Description

CONTROLLED TRUCK CAB SUSPENSION
CROSS REFERENCE TO RELATED APPLICATIONS
The present application claims priority of U.S. Provisional Application Nos. 60/405,136 filed August 21, 2002, and 60/465,146 filed April 24, 2003.
TECHNICAL FIELD
The present invention relates to the field of suspension systems to isolate vibration and, more particularly, to suspension systems for truck cabs and the like.
BACKGROUND OF THE INVENTION
Medium and heavy-duty trucks and tractors often have a suspension system installed between the truck frame and the driver's cab which reduces shock and vibration transmitted from the frame to the cab and thereby enhances driver comfort. As shown in Figs. 1, 2 and 3 of the drawings, a typical prior art suspension system, generally designated 10, is adapted to interconnect a truck cab 12 and an associated truck frame 14. The frame 14 typically includes rails 16, 18 joined by a transverse frame element 20. The forward portion 22 of the cab 12 is mounted on the frame 14 by bushings 24, 26. Bushings 24, 26 provide a flexible attachment for the front 22, while controlling relative fore and aft cab movement, as well as restricting lateral movement of the cab 12 relative to the frame 14.
The rear 28 of the cab 12 is attached to the frame 14 by a system that includes standard shock absorbers 30, 32, a panhard rod or transverse link 34, air springs 36, 38, and a height sensor or air control valve 40. The shock absorbers 30, 32 dampen vertical motion between the rear 28 of the cab 12 and the frame 14, and the panhard rod 34 restricts relative lateral motion between the cab and the frame. The air springs 36, 38 support the rear 28 of the cab 12 above the frame 14 and are selectively pressurized by the air control valve 40, which is connected to a source of pressurized air (not shown), in order to maintain the rear 28 of the cab 12 a predetermined distance above the frame 14 in response to varying loads in the cab.
A disadvantage with such prior art systems as the suspension system 10 shown in Figs. 1-3 is that such systems are overly complex, relatively expensive and occupy a relatively large amount of space beneath the cab and between the rails of the associated frame. Accordingly, there is a need for a suspension system for a truck cab that minimizes the components required to perform the suspension and shock absorbing function, provides lateral support and shock damping features, and at the same time minimizes the space required in the area between the cab and frame rales. There is also a need for a cab suspension system that controls cab ride height and provides an improved ride.
SUMMARY OF THE INVENTION
The present invention is a controlled suspension system, preferably for use between a truck cab and an associated track frame, that includes a strut module having an air sleeve that is capable of being selectively pressurized, a height sensor for measuring a distance between a truck cab and associated truck frame and a controller for receiving a signal from the height sensor and selectively pressurizing the air sleeve. The strut module is adapted to be mounted between the rear of a truck cab and an associated frame. A signal generated by the height sensor and read by the controller enables the controller to pressurize the air sleeve selectively in order to maintain a predetermined distance between an associated cab and frame to accommodate varying loads within the cab. The strut module also includes a strut, preferably a magnetorheological (MR) McPherson-type strut, that is actuated by the controller to vary the damping characteristics of the strut. In a preferred embodiment, the controller as well as the height sensor are mounted on and contained within the strut module so that the number of attachment points required by the system of the present invention to an associated cab and frame is minimized. Also in the preferred embodiment, the strut module includes a flange at an end thereof that provides two points of connection of a three-point connection system. This three-point connection system is arranged to restrict relative lateral movement between the cab and frame, thereby eliminating the need of the panhard rod or equivalent structure required by prior art suspension systems, such as that shown in Figs. 1-3. Another advantage of the preferred embodiment is that the controller controls the MR damper to provide an improved ride over prior art, non-adjustable dampers.
Also in the preferred embodiment, the air sleeve is concentric with and extends about the strut, incorporating the inner and outer strut tubes to define the pressurized chamber of the air sleeve. The resulting strut module is more compact and therefore requires less space than prior art suspension systems. As a result, space between the cab and frame available for other vehicle components is increased.
Other objects and advantages of the present invention will be apparent from the following description, the accompanying drawings and the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic, rear perspective view of a vehicle cab and frame showing a prior art suspension system;
Fig. 2 is a detail of the prior art suspension system shown in Fig. 1;
Fig. 3 is a schematic, perspective view of the suspension system of Fig. 1, taken from the side; Figs. 4 A, 4B and 4C are perspective views of the suspension system of the present invention;
Fig. 5 is a schematic, rear perspective view of a truck cab and frame incorporating the suspension system of Figs. 4A-4C;
Fig. 6 is a detail of Fig. 5 showing the connection of the suspension system of Figs. 4A-4C to a truck cab and frame;
Fig. 7 is a side elevational view of the strut module of the present invention;
Fig. 8 is a cross-section taken at line 8-8 of Fig. 7;
Fig. 9 is a detail side elevation in section of the strut module of Fig. 8; and
Fig. 10 is a cross-section taken at line 10-10 of Fig. 9.
DETAILED DESCRIPTION OF THE INVENTION
The suspension system of the present invention, generally designated 50, is shown in Figs. 4A, 4B and 4C. The suspension system 50 includes a strut module 52 that includes a strut 54, air sleeve 56 and a controller 58 of conventional design. Controller 58 is connected to receive a signal from a height sensor 60. The controller 58 preferably is integral with the height sensor 60. The strut module 52 also includes a double flange 62 having resilient connection points 64, 66 spaced on either side of the strut module. Together with connection point 68, connection points 64, 66 constitute a three-point connection between a cab and associated frame. Each of the connection points 64, 66, 68 includes a tubular sleeve 70, resilient bushmg 72 and inner, elongated sleeve 74. Each of the connection points 64, 66, 68 is adapted to be attached either to the cab 12 or frame 14 by bolts 76, 78, 80 (see Fig. 6). The height sensor 60 is of conventional design and includes a link 82 that is connected at an end 84 to the end 86 of the strut 54. As a result, movement of the strat 54 causes the height sensor 60 to detect a change in the spacing between the associated cab 12 and frame 14 (see Fig. 6). Accordingly, there is no need for separate connections between the suspension system 50 and the associated vehicle other than the three-point connections 64, 66, 68 of the strut module 52.
As shown in Figs. 5 and 6, the strut module 52 is mounted on a flange 88 at its upper end and to the transverse frame element 20 of associated truck frame 14 at its lower end. The flange 88 is, in turn, attached to the rear 28 of the cab 12. As mentioned earlier, the three-point connection 64, 66, 68 provides a resistance to relative lateral movement between the cab 12 and frame 14. The strat module 52 is connected to the flange 88 by bolts 76, 78, and to transverse frame element 20 by bolt 80. Since the height sensor 60 is integral with the , strat module 52, there is no need for additional connections between the suspension system 50 and the associated cab 12 and frame 14.
The details of the strut module 52 are shown in Figs. 7 and 8. The strat module 52 includes a strut 54, which preferably is an MR McPherson-type strat such as that disclosed in U.S. Pat. No. 6,345,706, the disclosure of which is incorporated herein by reference. Strut 54 includes an inner tube 90, an outer tube 92 and a bearing sleeve 94. The bearing sleeve 94 provides and interface between the inner and outer tubes 90, 92, respectively, that distributes bending moments applied to the ends of the strat 54. The inner tube 90 includes an inner rod 96 that is connected to a piston (not shown). The end of the inner rod 96 is threaded and receives a nut 98 and captures a strat base 100. A plug housing 102 is attached to the end of the strut base 100 and is connected to the controller 58 by a cable (not shown). The air sleeve 52 is shown in Figs. 7 and 8 and includes a tube 104 connected to an end plate 106 that, in turn, forms a seal with the inner tube 90 by means of a seal element 108, preferably an O-ring. The tube 104 is connected to a flexible sleeve 110 by a retaining ring 112. The flexible sleeve 110 is attached at its opposite end to the outer tube 92 by retaining ring 114. A fitting 116 is connected to a conduit 118 (see Figs. 4A-4C) that is connected to the controller 58. The controller 58 includes a fitting 120 that connects to a source of pressurized air (not shown) and a fitting 122 that connects to a source of electrical power (not shown).
1
/
As shown in Fig. 8, a primary air chamber 124 is formed by inner tube 90, end plate 108, flexible sleeve 110 and outer tube 92. Optionally, a secondary air chamber 126 can be formed, as shown in Figs. 8, 9 and 10. The secondary air chamber 126 is defined by outer tube 92, inner tube 90 and a seal adapter 128. The seal adapter 128 includes a central hole 130 that receives the end of the inner rod 96 and is shaped to receive a seal element, such as an O- ring 132, and a retaining ring 134. An O-ring 136 provides a seal between the seal adapter 128 and the outer tube 92. The seal adapter 128 is shaped to engage the strut base 98.
As shown in Fig. 10, the seal adapter 128 includes an anti-rotation projection (shown as flats 130) that mates with corresponding flats 132 formed in the strat base 98. This allows the nut 100 that retains the end of the inner rod 96 to be tightened without rotating the inner rod. Additionally, it may be necessary to provide an air flow groove at 134 (see Fig. 8) to provide a pneumatic connection between primary chamber 124 and secondary chamber 126.
In operation, the relative position between the inner tube 90 and the outer tube 92 of the strat 54 is detected by the height sensor 60, which generates a signal to the controller 58. In response to the signal, the controller 58 pressurizes the primary and secondary air chambers 124, 126, respectively, to maintain the spacing between the cab 12 and frame 14 within predetermined limits. This pressurization would result from a change in the weight or load present in the cab 12. In addition, the controller 58 generates an electrical signal to plug housing 102 that is transmitted through the inner rod 96 to adjust the damping characteristics of the MR strat 54.
While the forms of apparatus described herein constitute preferred embodiments of the invention, it is to be understood that the invention is not limited to these precise forms of apparatus, and that changes may be made therein without departing from the scope of the invention. Furthermore the suspension system 50 of the present invention may be used to support vehicle cabs and other enclosures above both stationary and vehicular support frames, as well as above framework for marine vessels.
What is claimed is:

Claims

1. A controlled suspension system for use between a track cab or the like and an associated vehicle frame comprising:
(a) a strat module adapted to be attached at one end to a track cab and at an opposite end to an associated vehicle frame, said strat module including an air sleeve capable of being selectively pressurized;
(b) said strat module including a height sensor for measuring a distance between said truck cab and said associated frame and generating a signal indicating thereof; and
(c) a controller for receiving said signal from said height sensor and selectively pressurizing said air sleeve;
(d) whereby said distance between said cab and said associated frame is maintained within desired limits by selective pressurization of said air sleeve.
2. The suspension system of claim 1 wherein said strut module includes a strut having an inner tube, an outer tube concentric with said inner tube and a bearing sleeve positioned between said inner tube and said outer tube, whereby said bearing sleeve distributes a bending moment applied to ends of said strat.
3. The suspension system of claim 2 wherein said air sleeve is connected to said inner tube and said outer tube.
4. The suspension system of claim 3 wherein said air sleeve is concentric with said inner tube.
5. The suspension system of claim 4 wherein said air sleeve includes a flexible portion connected to said outer tube.
6. The suspension system of claim 5 wherein said air sleeve includes a relatively rigid portion connection to said inner tube.
7. The suspension system of claim 6 wherein said relatively rigid portion is concentric with said inner tube.
8. The suspension of claim 2 wherein said relatively rigid portion, said flexible portion, said inner tube and said outer tube define a first air chamber of said air sleeve; and said air sleeve includes a seal adapter that, together with said inner tube and said outer tube, defines a second air chamber.
9. The suspension system of claim 2 wherein said strut module includes a three-point connection adapted to interconnect said cab and said frame, whereby said three-point connection resists relative lateral movement between said cab and said frame.
10. The suspension of claim 1 wherein said frame includes a transverse frame element and said strat is adapted to be attached thereto.
11. The suspension system of claim 10 wherein said strut is adapted to be positioned at substantially a midpoint of said transverse frame element.
12. The suspension system of claim 11 wherein said strut is adapted to be mounted on a downwardly-depending flange of said cab.
13. The suspension system of claim 1 wherein said controller is mounted on said strut.
14. The suspension system of claim 1 wherein said strut module includes mounting flange adapted to make a two-point connection to one of said cab or said frame; and said controller is mounted on said mounting flange.
15. The suspension system of claim 14 wherein said strat module includes a housing mounted on said mounting flange; and said housing encloses said controller and said height sensor.
16. The suspension system of claim 15 wherein said height sensor includes a link connected to said strut module adjacent an end opposite said mounting flange.
17. The suspension system of claim 16 wherein said end opposite said mounting flange is adapted to make a single point connection that, together with said two-point connection, makes a three-point connection between said cab and said frame, thereby resisting relative lateral movement between said cab and said frame.
18. The suspension system of claim 1 wherein said strut module includes an MR strut and said controller is connected to said MR strat to vary the damping characteristics thereof.
19. A controlled suspension system for use between a truck cab or the like and an associated vehicle frame comprising:
(a) a strat module adapted to be attached at one end to a track cab and at an opposite end to an associated frame, said strat including a three-point connection adapted to interconnect said cab and said frame, whereby said three- point connection resists relative lateral movement between said cab and said frame;
(b) a height sensor mounted on said strat module for measuring a distance therebetween and generating a signal indicative thereof; and
(c) a controller for receiving said signal from said height sensor and selectively pressurizing said strut module; (d) whereby said distance between said cab and said associated frame is maintained within desired limits by selective pressurization of said strat module by said controller.
20. The suspension system of claim 19 wherein said frame includes a transverse frame element and said strat module is adapted to be attached thereto.
21. The suspension system of claim 20 wherein said strut includes a mounting flange adjacent one end thereof; said mounting flange having a two- point connection; said two-point connection being a component of said three- point connection.
22. The suspension system of claim 21 wherein said two-point connection is adapted to be attached to one of said cab and said frame.
23. The suspension system of claim 19 wherein said controller is mounted on said strat module.
24. The suspension system of claim 19 wherein said strat module includes a housing containing said controller and said height sensor.
25. The suspension system of claim 24 wherein said housing is positioned adjacent an end of said strat module; and said height sensor includes a link extending from said housing and attached adjacent to an opposite end of said strat module.
26. The suspension system of claim 25 wherein said strat module includes a strat having an inner tube, an outer tube and a bearing sleeve interconnecting said inner and outer tubes; and said link is attached to said inner tube.
27. The suspension system of claim 19 wherein said strut module includes an MR strat and said controller is connected to said MR strut to vary the damping characteristics thereof.
28. The suspension system of claim 19 wherein said height sensor is integral with said controller.
PCT/US2003/026320 2002-08-21 2003-08-21 Controlled truck cab suspension Ceased WO2004018243A2 (en)

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US60/405,136 2002-08-21
US46514603P 2003-04-24 2003-04-24
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AU2003262787A8 (en) 2004-03-11
US7077227B2 (en) 2006-07-18
US20040129468A1 (en) 2004-07-08
AU2003262787A1 (en) 2004-03-11
WO2004018243A3 (en) 2004-05-13

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