US-20260126093-A1 - DAMPING CYLINDER ASSEMBLY

Abstract

A damping cylinder assembly has a cylinder, a damping accumulator and a base closure part. The cylinder has a closure part, a piston unit, a cylinder pipe with a guide-side cylinder pipe end and a base-side cylinder pipe end. The closure part is located on the guide-side cylinder pipe end. The base closure part has a cylinder pipe receiving portion, a damping accumulator receiving portion and a fluid channel that connects the cylinder pipe receiving portion and the accumulator receiving portion. The piston unit slidingly passes through the guide closure part and, together with the cylinder pipe and the base closure part define-a working space connected to the fluid channel. The accumulator has a pressure capsule and a fluid connection to the fluid channel.

Inventors

• Josef Bueter

Assignees

• Bümach Engineering International B.V.

Dates

Publication Date

20260507

Application Date

20230904

Priority Date

20221011

Claims (5)

1. 1 - 4 . (canceled)
2. 5 . A damping cylinder assembly, comprising: a hydraulic cylinder having a cylinder tube, a guide closure part, a base closure part and a piston unit, said cylinder tube having a guide-side cylinder tube end and a base-side cylinder tube end, said guide closure part being arranged at said guide-side cylinder tube end; a damping accumulator having a damping accumulator fluid connection and a pressure capsule having a fluid chamber and a pressure-deformable air chamber separated from said fluid chamber by a diaphragm; said base closure part having a cylinder tube receiving portion, a damping accumulator receiving portion, and a fluid channel connecting said cylinder tube receiving portion and said damping accumulator receiving portion; said cylinder tube arranged with said base-side cylinder tube end at said cylinder tube receiving portion, said piston unit slidingly passing through said guide closure part, said piston unit together with said cylinder tube and said base closure part, defining a working chamber connected to said fluid channel, said damping accumulator fluid connection being arranged at the base closure part, said damping accumulator fluid connection being connected to said fluid channel; said pressure capsule having an electron beam ring weld seam, said guide closure part connected to said cylinder tube in a positive substance manner by a first circumferential laser ring weld seam, said base closure part connected to said cylinder tube in a positive substance manner by a second circumferential laser ring weld seam.
3. 6 . The damping cylinder assembly according to claim 5 , wherein said cylinder tube receiving portion has a conical receiving contour, said cylinder tube has a conical ring surface that corresponds to said conical receiving contour, said second laser ring weld seam has a laser weld seam inclination angle which is 20 to 70 degrees, and said cylinder tube has an end portion that protrudes from said conical ring surface in an axially distal manner and said end portion has an axial ring surface that abuts against an axial mating ring surface of said cylinder tube receiving portion.
4. 7 . The damping cylinder assembly according to claim 6 , wherein said end portion has a wall thickness of 10 to 30 percent of a wall thickness of said cylinder tube and a radial outer lateral surface which abuts against a radial inner lateral surface of said cylinder tube receiving portion.
5. 8 . The damping cylinder assembly according to claim 5 , wherein said guide closure part has s a graduated hollow-cylindrical receiving contour, said hollow-cylindrical receiving contour has a radial outer ring surface that abuts against a guide-side inner lateral surface of said cylinder tube, and said guide closure part has a proximal axial ring surface that together with a guide-side distal axial mating ring surface of said cylinder tube, defines said first laser ring weld seam in a butt-jointed manner.

Description

The invention relates to a damping cylinder assembly, for demanding fields of application with high dynamic load, such as in agricultural machinery engineering, in particular. In the prior art it is known to provide damping systems that use heavy pressure springs, for example, in agricultural machinery engineering in soil cultivation. This solution is disadvantageous due to the low absorbable force and the poor characteristic curve. Hydraulic damping cylinders have proven to be more advantageous in the state of the art. This advantage applies in particular, if they are equipped with a diaphragm accumulator or a bladder accumulator. The high dynamic loads and the occurring pressure peaks that require particularly strong couplings are problematic. A disadvantage is the complex production required for this design, since extensive machining is necessary to manufacture the damping cylinder and the high thermal stresses associated with MAG welding, for example, can have a negative impact on quality and service life and require a high energy input. Furthermore, cleaning of the cylinder interior is disadvantageously required after MAG welding. Therefore, the alternative solution to couple the guide closure part by means of a screw connection is known in the art. The task of the invention is to provide a damping cylinder assembly that can be produced in a resource-saving manner, at high quality and in short time. The task is solved by the features listed in claim 1. Preferred further developments result from the sub-claims. The damping cylinder assembly according to the invention comprises a hydraulic cylinder and a damping accumulator as its basic components. The hydraulic cylinder acts as a pressure generator during a retraction movement and as a pressure consumer during an extension movement. During the retraction movement, which is effected by a force introduced by a coupled device component and which shall be performed in a damped manner, a fluid flow is generated and the fluid is pressed into the damping cylinder and received there. Conversely, during an extension movement, the fluid is discharged out of the damping accumulator under pressure and received by the hydraulic cylinder. In at least one movement direction of the fluid, the fluid flow is throttled and, thus, damping is caused. The hydraulic cylinder and the damping accumulator are hereinafter collectively referred to as the hydraulic units. The hydraulic cylinder comprises a cylinder pipe (hereinafter referred to as cylinder tube), a guide closure part, a base closure part and a piston unit. In this design, the cylinder tube comprises a guide-side cylinder tube end and a base-side cylinder tube end. The guide closure part is arranged at the guide-side cylinder tube end. The base closure part of the hydraulic cylinder is designed in a particular manner and comprises both a cylinder tube receiving portion, a damping accumulator receiving portion and a fluid channel. The cylinder tube is arranged with its base-side cylinder tube end at the cylinder tube receiving portion and forms a base-side axial boundary of the cylinder interior which is opposite the guide-side axial boundary of the cylinder interior. The piston unit slidingly passes through the guide closure part and, together with the cylinder tube and the base closure part, forms a working chamber. This working chamber is connected to the fluid channel so that, during a retraction movement, the fluid is displaced out of the decreasing working chamber and pressed into the fluid channel and, conversely, can flow into the working chamber via the fluid channel and cause an extension movement. The piston unit can be designed, in particular, as a unit consisting of a piston and a piston rod. However, it can also be designed as a plunger piston so that in this case the hydraulic cylinder is provided as a plunger cylinder. The fluid channel provided in the base closure part connects the cylinder tube receiving portion and the damping accumulator receiving portion. The damping accumulator comprises a pressure capsule and, accommodated by the pressure capsule, a fluid chamber and a pressure-deformable air chamber separated from the fluid chamber by a membrane. In this design, a pressure-deformable membrane-separated air chamber is understood to be a structural design in which, depending on the fluid pressure, a compression of the air enclosed in the air chamber is effected and, thus a preload of the air is produced which acts on the fluid. The compression causes a reduction in the volume of the air chamber so that the fluid chamber can receive correspondingly more fluid. Preferably, a diaphragm accumulator is used, although other constructive designs, such as a metal bellows accumulator, are also covered by the solution according to the invention. The damping accumulator further comprises a damping accumulator fluid connection, which is arranged at the base closure part. There, the damping accumulator is co