Vehicle axle suspension system

• US 9,174,509 B2
• Filed: 11/12/2013
• Issued: 11/03/2015
• Est. Priority Date: 11/12/2012
• Status: Active Grant

• Current Assignee: Deere & Company, Weber-Hydraulik GmbH
• Original Assignee: Deere & Company, Weber-Hydraulik GmbH
• Inventors: Boge, Christof, Kazimiers, Thilo, Mller, Benedikt, Zatrieb, Jacek
• Primary Examiner(s): GOODEN JR, BARRY J
• Application Number:
  US14/077,753
• Publication Number:
  US 20150001825A1
• Time in Patent Office: 721 Days
• Field of Search: 280/124.112, 280/124.157, 280/124.158, 280/124.159, 280/124.16
• US Class Current: 1/1
• CPC Class Codes: B60G 11/26 having fluid springs only, e.g. hydropneumatic springs B60G11/006, B60G15/12 take precedence
• CPC Class Codes: B60G 17/04 fluid spring characteristics
• CPC Class Codes: B60G 17/056 Regulating distributors or valves for hydropneumatic systemsB60G17/044 - B60G17/048, B60G17/0416 take precedence; Fluid interconnection systems to control vehicle inclination B60G21/06, B60G21/10; valves per se F16K
• CPC Class Codes: B60G 17/0565 Height adjusting valves
• CPC Class Codes: B60G 17/08 Characteristics of fluid dampers adjusting fluid dampers in general F16F9/44 - F16F9/53
• CPC Class Codes: B60G 21/073 between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
• CPC Class Codes: B60G 2202/154 with an accumulator
• CPC Class Codes: B60G 2202/413 Hydraulic actuator
• CPC Class Codes: B60G 2202/414 using electrohydraulic valves
• CPC Class Codes: B60G 2300/082 Tractors
• CPC Class Codes: B60G 2500/114 pressure regulating valves
• CPC Class Codes: B60G 9/02 the axle or housing being pivotally mounted on the vehicle , e.g. the pivotal axis being parallel to the longitudinal axis of the vehicle B60G9/003 takes precedence

Abstract

A suspension system is provided for a movable, supported vehicle axle. The suspension system includes a pair of hydraulic suspension cylinders, which are placed between the vehicle axle and a supporting vehicle structure. Each hydraulic suspension cylinder includes a first work chamber connected to a first pressure accumulator, and a second work chamber connected to a second pressure accumulator. A pressure-limiting valve is exposed to pressure in the first work chamber and has an outlet connected to the second pressure accumulator.

Claims

1. A suspension system for a movable, supported vehicle axle, having a hydraulic suspension cylinder connected between the axle and a supporting vehicle structure, wherein the hydraulic suspension cylinder includes a first work chamber connected to a first pressure accumulator, and a second work chamber connected to a second pressure accumulator, wherein:

a pressure-limiting valve is exposed to pressure in the first work chamber and is connected on an outlet side to the second pressure accumulator by a pressure relief line, wherein excess pressure flows from the outlet side of the pressure-limiting valve to the second pressure accumulator in order to protect the hydraulic suspension cylinder from travel-caused excess pressure peaks.

2. The suspension system of claim 1, wherein:

one of the pressure accumulators is a hydraulic accumulator.

3. The suspension system of claim 1, wherein:

the first pressure accumulator comprises a parallel connection of two separate pressure accumulators.

4. The suspension system of claim 1, wherein:

the first work chamber or the second work chamber of the hydraulic suspension cylinder is connected by a switching valve arrangement alternatively to a pressure source or to a hydraulic reservoir of a central hydraulic system.

5. The suspension system of claim 1, wherein:

the pressure-limiting valve is a pressure sequence valve.