Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
  • B60G11/26—Resilient suspensions characterised by arrangement, location or kind of springs having fluid springs only, e.g. hydropneumatic springs
  • B60G11/27—Resilient suspensions characterised by arrangement, location or kind of springs having fluid springs only, e.g. hydropneumatic springs wherein the fluid is a gas
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G9/00—Resilient suspensions of a rigid axle or axle housing for two or more wheels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G2200/00—Indexing codes relating to suspension types
  • B60G2200/30—Rigid axle suspensions
• • 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
  • B60G2202/10—Type of spring
  • B60G2202/15—Fluid spring
  • B60G2202/152—Pneumatic spring
• • 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
  • B60G2202/10—Type of spring
  • B60G2202/15—Fluid spring
  • B60G2202/152—Pneumatic spring
  • B60G2202/1524—Pneumatic spring with two air springs per wheel, arranged before and after the wheel axis
• • 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
• • 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
  • B60G2204/127—Mounting of springs or dampers with the mounting of springs or dampers moving so that the direction of the related force vector can be changed, thus contributing to a variation of the loading of the wheel

Definitions

• the present invention relates generally to an axle
• the invention relates in particular to a rear axle installation for a heavy
• the springs are for example attached to a spring beam at the same distances from the wheel shaft, but one of them is situated in front, and the other to the rear, of the wheel shaft, as viewed in the vehicle's longitudinal direction.
• bounce and pitch movements which may in principle be characterised as symmetrical movements.
• Bounce movements are usually movements of the spring beam in vertical directions, i.e. the spring beam moves upwards and downwards.
• Pitch movements are usually rotational movements of the spring beam about the wheel shaft. Every possible endeavour is made, by means of said springs, to insulate road-induced movements and vibrations. How these springs are installed affects significantly the magnitude of vibrations which make their way into the vehicle' s chassis from the carriageway via wheels and axle suspensions.
• the basic idea of the invention is therefore to achieve in a simple and cost-saving way a change in the assumptions for the rear axle installation so that bounce and pitch movements become to a lesser extent natural movements of the structure, i.e. so that the natural freguency of the wheel suspension is altered so that resonance movements initiated are damped out more quickly.
• US4196786 refers for example to a device for damping
• annular weights are each placed symmetrically on their respective sides of the axle's centrally positioned differential gear to impart to the driveshaft a mass or weight which alters the resonance
• axle installation should preferably not add further components or weight to the vehicle and should help to make the vehicle inexpensive to manufacture while nevertheless eliminating the disadvantages of the state of the art and therefore solving the problem of vibrations and resonances in the structure.
• One object of the invention is therefore to solve the
• a further object of the invention is to make it possible for components available on the market to be used in the
• a further object of the invention is that the structure should consist of as few components as possible and thereby help to minimise the component costs and achieve cost-effective manufacture .
• a further object of the invention is that it be possible to implement it in an existing structure or installation without having to make extensive changes.
• the invention thus relates generally to an axle installation in a vehicle which is so constructed that the symmetry of the axle installation and its components is altered or disrupted with the object of achieving a reduction in vibrations and resonance movements within a frequency range which a vehicle's driver and passengers find troublesome when the vehicle is in operation .
• At least one first spring' s characteristic and/or distance from the wheel shaft being different from a second spring' s characteristic and/or distance from the wheel shaft, so that an asymmetry is created in the axle installation, causing the natural
• the movement-reducing effect according to the invention is not achieved, however, if the location or characteristic of the two springs is altered on one spring beam but not on the other.
• the asymmetrical positioning of the springs has to be relative to the location of the wheel shaft in the vehicle's longitudinal direction.
• the springs may for example be air or steel springs, with different stiffnesses/characteristics and be situated on both sides of the axle, or alternatively the springs may be
• the invention makes it possible for components available on the market to be used, rendering the structure cost-effective and easy to implement. Since the structure according to the invention consists of few components, at least no more than in known solutions, the cost of the
• the invention is also implementable in an existing axle installation without having to make extensive structural changes, e.g. by replacing the springs by ones which are similar but have a different spring characteristic.
• Figure 1 is a perspective view of an exposed rear axle
• Figure 2 depicts in more detail a section through the rear axle according to Figure 1, in the form of a side view of one side of the rear axle installation.
• Figure 3 is the same side view as in Figure 2 but showing the location and fastening in the spring beam of one of the springs (the left spring in the diagram) displaced somewhat rearwards towards the rear axle with the object of altering the symmetry of the structure.
• Figure 4 is the same side view as in Figures 2 and 3 but in this case showing the location and fastening in the spring beam of the other spring (the right spring in the diagram) displaced somewhat forwards in the vehicle and nearer to the rear axle.
• Figure 5 is the same side view as in Figures 2 to 4 but using springs which differ in size, stiffness and/or characteristic.
• Figure 6 shows how the location of the wheel shaft on the spring beam may be displaced to achieve a change in the structure's resonance frequency.
• the invention thus relates to an axle installation for damping and reduction of the vibrations and resonance movements which occur in a vehicle during operation. It relates in particular to a rear axle installation for a heavy commercial vehicle, e.g. a bus.
• Figure 1 is a perspective view of an exposed rear axle
• the springs 5a-d which may be of various types/structures, e.g. so-called air springs/air bellows, steel springs or the like, are situated on the spring beams 4a, b, at the same distances from the wheel shaft 2, one of them in front, and the other to the rear, of the wheel shaft as viewed in the vehicle's longitudinal direction.
• the rear axle installation 1 is further provided with two wheel pairs 6a, b and the vibrations and movements which occur during the vehicle' s operation are damped by means of four shock absorbers 7a-d preferably likewise situated at the end portions of the spring beams 6a, b, close to the springs 5a-d, in order to achieve maximum damping effect.
• Figure 2 depicts in more detail a section through the rear axle 2 along the vehicle' s longitudinal direction as in Figure 1, showing a side view of one side of the rear axle
• the two springs 5a, b here in the form of air bellows, are fitted at the end portions of the spring beam 4a and have their respective opposite upper sides fastened in the vehicle's chassis 8 (here represented by broken lines).
• the wheel shaft 2 is situated in a spring seat 9.
• a wheel or wheel pair 6a is fitted at the outer end of the axle 2.
• Two arrowheads linked by a broken straight line represent the axle installation' s bounce
• movements x which are the spring beam's movements in vertical directions, and arrowheads linked by a curved line similarly represent the installation' s pitch movements y, which are the spring beam's rotational movements, turning movements, about the wheel shaft.
• Figure 3 depicts substantially the same structure as in Figure 2 but here showing the location and fastening in the spring beam of one forward spring 5a (the left spring in this drawing) displaced somewhat towards the rear axle 2, i.e. somewhat rearwards in the vehicle, with the object of altering the symmetry of the structure and reducing the distance a between the forward spring 5a and the wheel shaft 2.
• the distance b from the rear spring 5b to the wheel shaft remains unchanged and is therefore now relatively greater.
• FIG. 4 depicts substantially the same structure as in
• both of the air springs 5a, b can be shifted in the same structure but, if so, in such a way as to achieve an asymmetry of the wheel suspension.
• Figure 5 shows how components with different characteristics, e.g. different sizes, stiffnesses or characteristics, may be used (here depicted as springs 5a, b of different sizes), but with the same fastening points in the spring beam 4a.
• a combination of arrangements is of course also possible. It is for example possible for two components, e.g. springs 5a, b, which have different sizes and characteristics to be used, while at the same time their location in the structure, e.g. on the spring beam, forms an asymmetry in the structure.
• Figure 6 shows how the location of the wheel shaft 2 on the spring beam 4a may be altered to achieve a change

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Vehicle Body Suspensions (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=49223084

Family Applications (1)

Country Status (4)

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Family Cites Families (5)

• 2012
  • 2012-03-21 SE SE1250276A patent/SE1250276A1/sv not_active Application Discontinuation
• 2013
  • 2013-03-11 EP EP13764408.4A patent/EP2828105A4/de not_active Withdrawn
  • 2013-03-11 CN CN201380021018.3A patent/CN104245370A/zh active Pending
  • 2013-03-11 WO PCT/SE2013/050213 patent/WO2013141778A1/en active Application Filing

Non-Patent Citations (2)

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