Abstract: A supporting structure of a vehicle power source consists of a plurality of mount members having elasticity through which a power source is mounted on a vehicle body; first mount members for primarily sharing the weight of the power source and at least one of the first mount members, which is supported by the vehicle body at a first height lower than the height of a gravity center of the power source, is attached to a sub-frame; and second mount members for secondarily sharing the weight of the power source and the second mount members, which are attached to the vehicle body at a second height higher than the gravity center of the power source. A height of a center of elasticity of the supporting structure defined by the first and second mount members is set to be higher than a height of the gravity center of the power source.

Abstract: A motor for driving an axle shaft of a vehicle, a fuel cell, and a power control unit are arranged in the same space of a vehicle body in an electric vehicle. The motor is mounted on a suspension frame. The fuel cell and power control unit are mounted on a FC frame provided on the suspension frame.

Abstract: A vehicular power unit mount structure having a first mounting member for attachment to a power unit and a second mounting member elastically connected to the first mounting member for attachment to a vehicle body. The mount structure includes an elastic waterproofing cover having an axial displacement stopper and a radial displacement stopper. The axial displacement stopper is engageable with an end of a tubular portion of the second mounting member to elastically absorb impact shock and eventually stop movement of a shaft portion of the first mounting member when the shaft portion is displaced in an axial direction toward the second mounting member. The radial displacement stopper is engageable with an inner cylindrical surface of the tubular portion to elastically absorb impact shock and eventually stop movement of the shaft portion when the shaft portion is displaced in a radial direction relative to the second mounting member.

Abstract: A vibration damping system for an engine mounted on a vehicle has mounting elements attached to frames of the vehicle, through which elements the engine is mounted on the frames, a damping weight provided outwardly of the engine, and a weight support unit fixed at one end thereof to the engine and having the damping weight attached at the other end thereof. The weight support unit includes a first arm extending along one lateral side of a vertical plane extending through an axis of a crankshaft and a second arm extending along the other lateral side of the vertical plane. The damping weight is attached to free ends of the arms. The damping weight is positioned above the cylinder head of the engine to extend transversely of the vertical plane.

Abstract: A transmission mount structure for mounting a transmission connected to an end of a transverse-mounted engine to a vehicle body includes an elastic main vibration-damping member for reducing both vibrations in a vertical direction and vibrations in a roll direction, and an elastic auxiliary vibration-damping member smaller in diameter or thickness than the main vibration-damping member and extending in a direction substantially perpendicular to the roll direction. The auxiliary vibration-damping member has a constricted portion formed at a longitudinal central portion thereof and having a smaller cross-section than any other part of the auxiliary vibration-damping member.

Abstract: The vehicular engine mounting structure includes a liquid sealed type bush instead of a rubber embedded bush. The mounting structure also includes: a chassis bracket having a circular supporter for receiving the bush. Two attachment parts of the chassis bracket are coupled to at a front side member. Vertical reinforcing members and a connection reinforcing member for supporting the vertical reinforcing members are installed in the front side member.

Abstract: A skid steer loader and like off-road vehicles with engine mounts having internally snubbed shocks and vibrations isolators, particularly for mounting three and four cylinder engines. The engine mount provides for minimized damage due to shocks from the chassis to the engine and due to vibrations from the engine to the chassis.

Abstract: A front-end structure comprising a panel body (400) to which a center member (500), being fixed to a body of a vehicle at a front end of the vehicle and supporting, at least, a driving engine (E/G), is joined, wherein the panel body (400) is molded out of aluminum by die-casting and a joining section (421) of the panel body (400) to which the center member (500) is joined has a mechanical strength higher than that of any other sections of the panel body (400) near the joining section (421) except the joining section (421).

Abstract: A system for mounting a vehicle power train, such as a transversely mounted engine and transmission, to a motor vehicle such that vibrations from the power train are isolated from the vehicle frame. The system comprises a power train mounting cradle for mounting to the vehicle frame by a vibration-isolating mounts, and vibration-isolating mounts for connecting the power train to the cradle, at least one of the power train to cradle mounts adapted to damp torque-related vibrations, and further comprising a friction damper to attenuate low-frequency torque-related vibrations.

Abstract: An engine mount for a vehicle, such as a snowmobile, that can be used when space for the engine within a chassis is limited and which is easily accessed from the side of the chassis for assembly and repair. The engine mount can be attached to the bottom of an engine that is positioned within a chassis. The engine mount can include four hollow, cylindrical portions. Each cylindrical portion having an axis extending transverse to the longitudinal direction of the snowmobile chassis and receiving a damping mount. Fasteners can be inserted through the chassis to couple with the damping mounts and cylindrical portions in a direction that is transverse to the longitudinal direction of the chassis. The configuration of the damping mounts permits effective damping especially in a direction transverse to the direction of forward travel of the vehicle.

Abstract: An engine mount for a vehicle, such as a snowmobile, that can be used when space for the engine within a chassis is limited and which is easily accessed from the side of the chassis for assembly and repair. The engine mount can be attached to the bottom of an engine that is positioned within a chassis. The engine mount can include four hollow, cylindrical portions. Each cylindrical portion having an axis extending transverse to the longitudinal direction of the snowmobile chassis and receiving a damping mount. Fasteners can be inserted through the chassis to couple with the damping mounts and cylindrical portions in a direction that is transverse to the longitudinal direction of the chassis. The configuration of the damping mounts permits effective damping especially in a direction transverse to the direction of forward travel of the vehicle.

Abstract: A system for supporting the torque of an internal-combustion engine has a support arranged transversely in the vehicle. This support has a strut as well as a support arm. These two support parts are connected with one another by way of an elastic bearing, the strut being fastened on a camshaft housing and the support arm being fastened on the side member of the vehicle. The elastic bearing is connected with the vehicle body structure, for example, on a spring strut dome, by way of a console.

Abstract: An engine mount for a vehicle, such as a snowmobile, that can be used when space for the engine within a chassis is limited and which is easily accessed from the side of the chassis for assembly and repair. The engine mount can be attached to the bottom of an engine that is positioned within a chassis. The engine mount can include four hollow, cylindrical portions. Each cylindrical portion having an axis extending transverse to the longitudinal direction of the snowmobile chassis and receiving a damping mount. Fasteners can be inserted through the chassis to couple with the damping mounts and cylindrical portions in a direction that is transverse to the longitudinal direction of the chassis. The configuration of the damping mounts permits effective damping especially in a direction transverse to the direction of forward travel of the vehicle.

Abstract: An engine mount for a vehicle, such as a snowmobile, that can be used when space for the engine within a chassis is limited and which is easily accessed from the side of the chassis for assembly and repair. The engine mount can be attached to the bottom of an engine that is positioned within a chassis. The engine mount can include four hollow, cylindrical portions. Each cylindrical portion having an axis extending transverse to the longitudinal direction of the snowmobile chassis and receiving a damping mount. Fasteners can be inserted through the chassis to couple with the damping mounts and cylindrical portions in a direction that is transverse to the longitudinal direction of the chassis. The configuration of the damping mounts permits effective damping especially in a direction transverse to the direction of forward travel of the vehicle.

Abstract: An antivibration support has a first strength member which includes a limit finger and two parallel support fingers, a second strength member which includes a cage surrounding the limit finger in part, and an elastomer link device interposed between the outside of the cage and the support fingers.

Abstract: A material-handling vehicle comprising a structure having, ground engageable propulsion means, a loader arm mounted for up and down swinging movement, an operator's cab, an engine having an output to provide power for said movement of the loader arm and propulsion of the vehicle and drive to connect the output to the ground engageable propulsion means to propel the vehicle, wherein the output of the engine is kinematically connected to a change speed gearbox which drives at least a rear axle of the vehicle, at least one of the engine and change speed gearbox being connected to the rear axle to provide a sub-assembly and said sub-assembly being mounted on said structure for pivotal movement about an axis which lies in, or is parallel to, a plane which contains the longitudinal axis of the vehicle.

Abstract: An auxiliary chassis for a motor vehicle is formed as a generally rectangular structure for holding an engine, transmission and other equipment. The auxiliary chassis is mounted to front end structural members at a position spaced from and below the structural member forming a further impact absorbing structure.

Abstract: To provide a vehicle body frame having a simple structure which can be flexible at the time of cornering. A cross pipe which connects a pair of left and right main frames in a traverse direction are provided. An arm portion is provided which extends from an intermediate portion of the cross pipe in the frontward direction and approximately horizontally. An upper engine hanger has one end thereof mounted on an extended end portion of the arm portion and the other end thereof extending downwardly and connected with a cylinder head portion of an engine.

Abstract: A motor 1 for traveling is attached to a frame 6 of a vehicle via mounts 3, 4 and 5 absorbing vibration. An air compressor 10 and an air compressor driving motor 11 are attached with respect to said motor 1 for traveling. The mounts 3, 4 and 5 are placed to be shared mounts absorbing vibration of the motor 1 for traveling, the air compressor 10 and the air compressor driving motor 11.

Abstract: A subframe for suspension of a vehicle includes at least a hollow frame member and a connecting member joined with an end of the hollow frame member. The connecting member includes a bracket section supporting a link of a suspension, and a collar section formed with a circular hole for receiving an insulator. The connecting member further includes at least one projection projecting from the collar section and defining an enlarged continuous joint surface with the collar section. The hollow member is joined by butt welding to the joint surface formed by the projection and the collar section.

Abstract: An engine mount assembly includes a vehicle frame bracket supporting an engine mounted bracket through an isolator. The frame includes three triangularly positioned tubes extending through a frame rail and defining openings for bolts that secure the frame bracket to the frame. Two longitudinally spaced upper tubes engage V recesses formed by a lip on the frame bracket that guides the bracket into longitudinal alignment with the frame openings during assembly. An inclined ramp on the face of the frame bracket helps position the engine laterally during assembly. Optional flanges on the upper tubes engage slots in the V recesses to prevent lateral movement of the assembly prior to installation of the mounting bolts through the frame tubes. A laterally elongated opening in an isolator support on the frame bracket allows final adjustment of the engine lateral position, if needed.

Abstract: A variable displacement engine for a vehicle has a sequential fuel injector firing order to sequence the fuel injector firing signals to the fuel injectors of each cylinder of the engine in a sequential manner regardless of the number of cylinders which are operated under any given engine load. A connecting bridge connects the injector firing signals as determined by the engine controller for the desired number of operative cylinders under any load to the fuel injectors in a sequential, manner as the bridge sequences through positions after each injector firing cycle. A solid torque tube system rigidly interconnects the engine, the transmission and the rear axle of the vehicle to form a solid torque member having a natural frequency of oscillation higher than any vibrational frequency that can occur during operation of the vehicle. A rigid torque tube is fixedly connected between the transmission and the rear axle.

Abstract: An engine mount with vertical alignment for mounting a powertrain member on a chassis of a vehicle. The engine mount with vertical alignment has a mount body which has a hollow core for housing a metal core. The metal core has at least one channel for accepting a vertically placed bolt, the metal core being held in position by a rubber mount. The metal core interfaces with a mounting bracket that is connected to a powertrain member for vertical mounting onto a chassis.

Abstract: A motor-vehicle, particularly an electrically-powered car of small size, has a supporting structure in the form of a reticular framework (2) of light alloy. The framework (2) includes two side structures (3) each formed by extruded profile elements (4) which are welded to joining knot elements (5) which have been obtained by casting. The side structures (3) are connected to each other by cross members (6, 7, 8, 9) which also are formed by extruded profile elements having their ends connected to the side structures (3) by mechanical coupling means, such as screws.

Abstract: An engine/transmission mounting arrangement in a front wheel drive vehicle including a bearing support at either end of the engine/transmission and an improved torque strut between the vehicle structure and the engine/transmission for restraining torsionally induced rolling movements of the engine/transmission. The improved torque strut having a substantial added mass to an end portion adjacent to the connection of the torque strut with the engine/transmission.

Abstract: A motorcycle includes a plurality of tie rods, a front resilient mount interconnecting the engine with the frame, and a rear resilient mount that interconnects the frame with the transmission, and that is positioned above the pivot mount between the swing arm and the transmission.

Abstract: A frame structure is provided for an industrial vehicle to protect an engine from an external impact as well as to facilitate a maintenance workability with respect to the engine. In the frame structure for the industrial vehicle, a planar base plate is provided, which is connected to rear portions of side frames elongated in parallel to a front-to-rear direction and which is elongated rearwardly, so that a vertical load acting on a rear axle is received by the base plate. An engine is mounted on the base plate, and the rear end portion of the base plate is connected to the rear end upper portions of the side frames through a rear member constructed by rod-like members and disposed to surround the rear surface and side surfaces of the engine. The vibrations of the engine is absorbed by the elastic deflection of the base plate and the elastic deformation of the rear tires.

Abstract: A drive unit capable of being coupled to a wheeled body to form a vehicle. The drive unit includes a construction having a frame with two opposite edges parallel to the forward direction, the frame supports a driving power source and is in turn supported along said opposite edges by a pair of side walls that are respectively supported on at least one wheel-like member and define a housing for transmission connecting the driving power source to the wheel-like members, each of the side walls has two opposite surfaces perpendicular to the forward direction, and coupling/un-coupling devices provided on the surfaces for releasably engaging the wheeled body.

Abstract: A shock absorbing vehicle body structure in a vehicle includes a substantially quadrilateral front subsidiary frame comprised of left and right side members extending in a longitudinal direction of a vehicle body and connected at their front and rear ends to each other by a front cross member and a rear cross member. The front subsidiary frame is supported at its four corners on main frames for the vehicle body through rubber mounts and bolts. Upon full-lap collision of the vehicle, the left rear bolt is first broken, whereby the rear end of the left side member is separated from the main frame and then, the right rear bolt is broken, whereby the rear end of the right side member is separated from the main frame. The right and left side members are formed with different rigidities to a longitudinal load applied thereto, which causes the right and left rear bolts to break at different times, or with a time lag therebetween.

Abstract: An engine cradle structure having a read lateral member and a forward cross frame attached to a body of a vehicle further includes a pair of longitudinal arms extend between the member and the frame and are further attached thereto. The longitudinal arms include a portion which curves toward a vehicle centerline near the attachment with the rear lateral member. The longitudinal arms further include a portion which curves out of a plane defined by the body of the vehicle. The curved portions cooperate to direct forces and displace the engine cradle underneath the vehicle and away from the vehicle toe pan.

Abstract: An engine mount for a saddle-seat vehicle includes an upper engine mount operatively connected to the engine of the vehicle. The upper engine mount operatively connects the engine to the frame of the vehicle. At least one connector is provided for connecting the engine to the upper engine mount. The upper engine mount permits substantially free vertical movement of the engine relative to the frame. The upper engine mount includes an outer sleeve operatively connected to the frame. The upper engine mount further includes an elastic cushion arranged between the connector and the outer sleeve. The upper engine mount may further include an inner sleeve located within the elastic cushion for passage of the connector therethrough. The upper engine mount further includes a plate bracket operatively connected between the outer sleeve and the frame. The plate bracket may include lightening holes therein for decreasing the weight of the plate bracket while increasing flexibility of the plate bracket.

Abstract: A powertrain (12) including a transmission (16) and an engine (18) is supported on a motor vehicle structure (10) by a plurality of powertrain mounting brackets. At least one of the powertrain mounts (22) includes a plate member (40) having therein an elongated aperture 42 with first and second protuberances (70, 72) for providing releasable retention of the powertrain mounting bracket (20) and powertrain (12) relative to a structural member (22) of the motor vehicle structure (10). This powertrain mounting bracket (22) is useful for allowing the powertrain to shift forward a predetermined amount when subjected to a substantial inertial force.

Abstract: A drive motor mounting module for a hybrid electric vehicle and the motor mounting module in combination with the hybrid electric vehicle. More specifically, the drive motor mounting module is comprised of a drive motor, a front motor mount support bracket, a chassis front support bracket, a chassis cross member, two rear motor mount brackets, two cross braces, two vertical channels and two motor module locating mounts. The entire module can be modularly assembled prior to installation to the vehicle chassis on a main assembly line. The mounting module engages the drive motor to the chassis by three point mountings.

Abstract: A motor vehicle has its power unit connected to its vehicle structure via a suspension provided with at least one mount which comprises a rigid support arm secured to the power unit, an antivibration support including an elastomer body which supports the power unit while allowing displacements of the power unit at least parallel to a vertical first axis and parallel to a horizontal second axis, and a displacement limiter acting parallel to the second axis. The displacement limiter comprises three rigid fingers perpendicular to the second axis, together with two limiter rings of elastomer reinforced with strong thread, each ring surrounding two of the three fingers, specifically a finger secured to the support arm and a finger secured to the vehicle structure.

Abstract: A vehicle mounting system is disclosed having a transfer arm coupled between the engine and the vehicle's rear axle for equalizing rear tire traction, control violent vibrations due to tire shake, improve drivability of the vehicle and safe control thereof The arm works by torque rotation of the engine at acceleration creating an upward force of the transfer arm at the area engine mount.

Abstract: An engine mounting structure is provided for use with a turf care machine such as a greens mower. Single cylinder engines, such as are used on greens mowers and similar turf care cutting machines, generate significant vibration. Greens mowers and which are used for finish cutting lose cut quality and precision with excessive vibration. To reduce vibration, an improved mounting structure includes resilient mounts to support the rear portion of the engine on the machine frame. To avoid belt misalignment between the engine drive pulley and the driven pulley powering the cutting reel, which can occur when resiliently mounting an engine, the forward portion of the engine is rigidly secured to the machine frame.

Abstract: A mounting system for supporting an engine within a chassis frame of an automotive vehicle includes a chassis bracket adapted for attachment to a chassis frame and having a mounting pin extending laterally into an engine compartment, and an engine bracket adapted for attachment to an engine, with the engine bracket having a first portion for attaching the engine bracket to an engine and a second portion having at least one generally horizontal surface for engaging the chassis bracket slidably along an axis parallel to a horizontal plane defined by the chassis frame.

Abstract: A frame beaming reduction assembly for use with a motor vehicle to eliminate or reduce the amplitude of frame beaming oscillations in a vehicle's frame caused by vibratory forces exerted on a motor vehicle. The assembly includes a frame having a beaming frequency in a first range of frequencies, and an engine is attached to the frame wherein the engine generates engine vibration that has a second range of frequencies that is different than the first range of frequencies. A spring is positioned between a cross member of the frame and a forward engine mount of the engine. A damper formed by a pair of shock absorbers is positioned between the frame and a second forward engine mount substantially parallel to the spring such that the combination of the damper, the spring, and the engine has an offsetting frequency that is substantially equal to the frame's beaming frequency and that offsets the beaming frequency.

Abstract: A lift truck 1 with a telescopic arm 3 comprises a front axle 6 and a rear axle 7 and a mechanical transmission to transmit the movement of the drive train 5 to the forward 6 and/or rear 7 axle or axles. The drive train 5 is oriented transversely to the truck 1 and the mechanical transmission is located in a central position. This arrangement permits easy access to the drive train and rapid exchange of the latter, so as to facilitate the maintenance and reduce the down time of the lift truck.

Abstract: A chassis for an automobile has inner and outer frames pivotally connected together intermediate front and rear ends of the frames. The inner frame is connected directly to a rear end without resilient suspension and supports a motor driving a differential and rear wheels in the rear end. The outer frame supports a car body and a driver seat. Front steering wheels are supported by respective resilient suspensions on the outer frame. Rear resilient suspensions include rocker arms and Watts links connecting the inner and outer frames spaced from the intermediate pivot for resiliently controlling pivotal motion of the outer frame relative to the inner frame. The rear suspensions are positioned in front of the pivot between inner and outer chassis frames and in front of the motor.

Abstract: A car is disclosed having a chassis, an engine, a drive axle assembly, and an engine mounting system. The engine mounting system includes a front engine mount and a rear engine mount. The front engine mount has a first load bearing tie member pivotably connected to the chassis and directly rigidly attached to the engine block. The rear engine mount has a second load bearing tie member directly attached to the drive axle assembly and directly rigidly attached to the engine block. The engine block and two tie members form a rigid unitary assembly.

Abstract: An electric control apparatus for a shock absorber disposed between unsprung mass and sprung mass of a suspension mechanism in an automative vehicle and provided with an electrically operated control valve for changing damping characteristics of vertical displacement of the sprung mass relative to the unsprung mass, wherein absolute vertical displacement velocity of the sprung mass and relative vertical displacement velocity of the sprung mass to the unsprung mass are detected to determine a target opening degree of the control valve in accordance with the detected absolute vertical displacement velocity and relative vertical displacement velocity of the sprung mass, and where variation of the target opening degree is allowed in a large range only when the direction of the relative vertical displacement velocity has changed and is restricted in a predetermined small range under other conditions where the shock absorber acts to absorb vibration of the vehicle body.

Abstract: A gear box mounting for a motor vehicle has a first member adapted to be mounted with respect to the vehicle gear box and a second member adapted to be connected to a sub-frame. The first and second members are interconnected by resilient elements inclined towards one another in a plane transverse to the longitudinal axis of the vehicle in order to provide vertical and lateral compliance of the gear box relative to the sub-frame. Buffering elements are provided between the first member and the second member and between the first member and the sub-frame to provide progressive buffering in the vertical upward and downward directions.

Abstract: A mounting structure for mounting to a vehicle body having oppositely disposed strut towers includes right and left suspension assemblies, a cradle operatively connected therebetween, a vehicle engine and transmission mounted on the cradle and guide means provided on each of the suspension assemblies. The mounting structure is adapted to being mounted as a unit into the vehicle body with the guide means guiding the suspension assemblies into engagement with the respective oppositely disposed strut towers, and suitable fasteners for securing the suspension assemblies to the strut towers. Each strut tower includes outer and inner interconnected, spaced apart wall members separated by support spacers, with a plurality of aligned openings formed through the outer and inner spaced apart wall members, a pair of guide openings formed in the inner wall member, and an opening formed through the outer and inner wall members' central portion.

Abstract: A wheeled-chair chassis with a suspension mechanism which comprises a chassis structure, a suspension system, a transmission system and two front and rear wheels; the chassis structure includes a steel pipe frame similar to an inverse triangular frame. The suspension system includes shock absorbers, rocker arms, and pivot pins; one end of the rocker arm is connected with a pivot base on lower end of the steel pipe frame by means of a pin, while the other end thereof is mounted with a gear rack for mounting a motor of the transmission system, a gear box, and the rear wheels. The shock absorber is fixedly mounted between the steel pipe frame and the rocker arm to provide a retractable movement for absorbing a shake from the rear wheels and the rocker arm caused by a rough road surface in order to provide the chair with a comfortable driving. Since each of the systems is an independent assembly, it is easy to assemble.

Abstract: A general delivery load carrying vehicle comprising a unitized load and stress bearing monocoque body and a front wheel drive engine unit. The body comprises a base floor, side walls and a top wall or roof structurally interconnected to support the vertical and torsional forces on the vehicle. The base floor has a length sufficient to provide a cab area and a load carrying area. The base floor is such as to provide a floor in the cab area that is at the same height throughout and at a level such that persons entering the vehicle may step into the vehicle directly in a single step without the need for additional structural steps or running boards. The side walls have openings adjacent the cab area for entrance and exit and one end wall defines structural pillars for receiving the windshield.

Abstract: A noise reduction side-branch reactive silencer for use with the air induction system of an internal combustion engine. The side-branch reactive silencer is contained within a subframe interposed between the engine and a vehicle body. The subframe is a rigid structure and forms a reactive cavity therein. The subframe has a connector for communicating the reactive cavity with the air induction system of the vehicle. The connector is positioned along the subframe in accordance with the desired attenuation frequency.

Abstract: An improved drive unit and suspension arrangement therefor for a small snowmobile having an open tubular frame. The drive unit includes an internal combustion engine and a pulley type transmission. The pulley type transmission is supported within a transmission casing and is affixed to the frame for rigidifying the frame. The suspension permits more vertical compliance than for and aft compliance for vibration dampening without adversely effecting the rigidity.

Abstract: The body (12) of a vehicle (10) is mounted on forward and rearward wheels (16, 18) by an elongated tie structure (20) extending along the lower elevations of the vehicle. The tie structure (20) is connected to the body (12) to pivot about longitudinal and transverse axes (21L, 21T) that intersect at a pivot point (22) located at an elevation above the center of gravity of the vehicle. The tie structure (20) is connected to the wheels (16, 18) by pivot arm assemblies (26). Resilient first load control devices (136), forming part of the pivot arm assemblies (26), are interconnected between the tie structure and the vehicle wheels, and second load control devices (28) are connected between the body and the wheels, with the capacities of the first and second load-carrying devices selected to cause the pitch and roll stiffness of the tie structure to be greater than the pitch and roll stiffness of the body.

Abstract: An engine and transmission mounting system has mounts which support the weight of the engine and transmission and which dampen vertical vibrations due to operation of the internal-combustion engine. A separate torque reaction mechanism reacts torque generated in the transmission directly against the vehicle chassis while permitting free vertical movement of the engine and transmission.