DD211603A1 - ADJUSTING DEVICE FOR RADIAL PISTON MACHINES WITH A FORGED VOLUME OF VOLUME - Google Patents

Abstract

The invention relates to an adjusting device for hydrostatic radial piston machines with veraenderlichem displacement volume by changing the Exzentrizitaet about arranged in the shaft adjusting piston. The object of the invention is to improve the performance of the fluid flow for acting on the adjusting piston from the stationary housing to the rotating shaft. This is done according to the invention in that the fluid rotary feedthrough between the housing and the rotary valve for controlling the fluid inlet and outlet for the working piston is at the same time the rotary passage for the fluid for acting on the adjusting piston. To control the line connections between rotary valve and adjusting a Umsteuerwelle is arranged between rotary valve and shaft.

Description

Adjusting device for radial piston machines with variable displacement volumes

Field of application of the invention

The invention relates to an adjusting device for hydrostatic radial piston machines with variable displacement sv ο lumen. The change in the displacement volume is effected by changing the eccentricity of a rotating with the shaft Sbczenterringes on which the working piston supported by hydrostatically relieved sliding shoes. To adjust the eccentric serve two arranged in the shaft, hydraulically actuated adjusting piston, which via a fluid rotary feedthrough with the Bin-. gangs- or output terminal of the radial piston engine are connected.

Characteristic of the known technical solutions

In the known radial piston machines with Eszenterverstellung by adjusting piston arranged in the shaft, a partial flow is branched off from the high-pressure supply outside the radial piston engine for pressurizing the adjusting piston during engine operation and passed through the stationary housing and a special rotary feedthrough in the rotating shaft.

With this version, the adjustment pressure in the amount of the working pressure constantly acts on one of the adjusting pistons and

keep him in his position. Thus, the constant high pressure rotary seal is required. However, this is technically difficult to control and prone to failure. In addition, pressure-dependent leakage and friction losses occur.

Object of the invention

The aim of the invention is an adjustment for Hadialkolbenmaschinen with variable displacement volume, preferably for those with rotary valve control, which works reliably with simple means.

Explanation of the essence of the invention

The invention has for its object to provide an adjustment in which by a simplified implementation of Verstellvolumenstromes or. Verstelldruckes from the stationary housing of the radial piston machine in the rotating shaft, the target position is met.

Brfindungsgemäß this happens in that the fluid rotary feedthrough between the control housing of the Hadialkolbenmaschine and the rotary valve for controlling the Fluidzu- and -ablaufs for the working piston at the same time the rotary feedthrough for the fluid to act on the adjusting in the time is between the rotary valve and shaft, with these rotatably connected _s arranged a Umsteuerwelle, in which, due to change of direction and independent Sxzenterverstellung j for controlling the line connections between the rotary valve and the adjusting is acted upon from the outside with a low control pressure directional control valve.

This directional control valve is on the other hand acted upon by the pressure of a spring piston longitudinal slide whose fluid feeds from the rotary valve and fluid discharges to

to the shaft via pierced and sealed driving bolts done. The driving pins are arranged to transmit the rotational movement between the shaft, reversing shaft and rotary valve.

The rotary valve has on both sides of its control grooves Druckausgleichsnuten .. Preferably from the Umsteuerwelle associated pressure equalization groove of the Pluidstrom is tapped for acting on the adjusting piston via holes.

At the reversing shaft opposite side of the rotary valve an axial sliding disk is arranged in the control housing.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. Show this

Pig. 1 is a longitudinal section through the adjustment of a Hadiaikolbenmotors,

Pig. 2 is a section A-A through the entrainment between rotary valve and ümsteuerwelle,

Pig »3 a section B-B by the entrainment between Umsteuerwelle and output shaft.

In the control housing 1 of the Sadialkolbenmotors a rotary valve 2 is arranged. The rotary valve 2 has two iüngnuten 3 »4, dj-s via (not shown) channels with two circumferential control grooves 5 and two Druckausgleichsnuten 5, 7 are connected. The Hohrleitungsanschlüsse 8, 9 ö.ss control housing 1 (inlet / outlet) open onto the Hingnuten 3? 4 · and are connected via the control grooves 5 and inlet and outlet channels 10 with the (not shown) working piston of the radial piston motor.

The control housing 1 and the rotary valve 2 thus form a rotary feedthrough to control the radial piston motor by the S ¹ iuid passes from the fixed control housing 1 in the rotary valve 2 and from there again via the control housing 1 to the working piston to produce torque and rotational movement. This rotary feedthrough, which in any case already exists for controlling the radial piston motor, is now also used according to the invention for acting on the adjusting pistons 12, 13 arranged in the rotating output shaft 11.

To influence the eccentricity, also independent of the direction of rotation of the radial piston engine, a reversing shaft is arranged between the rotary valve 2 and the output shaft 11. The rotation of the output shaft 11 is drive shaft through driving pins 15, 15 '»1-5 *' on the order. 14 and from this durch.Mitnahmebolzen 16, 16 ¹ transmitted to the rotary valve 2. All driving bolts 15, 15 ¹ , · 15 ¹¹ , 16, 16 'are sealed in the receiving components. Perpendicular to the axis of rotation in the Umsteuerwelle 14, a piston longitudinal slide 17 is arranged as a directional control valve, line spring 18 which is arranged in a screw plug 19 which closes the bore of the piston longitudinal slide 17, pushes the piston longitudinal slide I7 in a 3ndstellung. On the other hand, the bore of the Eolbenlängsschiebers 17 is limited by a pierced screw plug 20 which is connected via an annular channel 21 constantly with a bore 22 in the control housing 1. Via this bore 22, the control fluid flow is supplied to switch the piston longitudinal slide 17 into its other position. Due to the low pressure of this control fluid flow friction and leakage to the sealing elements 23j 24 of the reversing shaft 14 are minimal.

The controlled by the piston longitudinal slide I7 supply of Fluidstrom.es for adjusting the adjusting piston 12, I3 is made of the pressure equalization 7, of which, each a bore 25, 25 ', each one of the pierced driving pin 16, 15' leads to the bore of Piston-

longitudinal slide 17 »The two outer discharges from the bore of the piston longitudinal slide 17 are connected by means of a transverse bore 25. From this, via the pierced driving pin 15, a bore 27 leads to the adjusting piston 12. The middle discharge from the bore of the piston longitudinal slide I7 leads over the through-drilled driving pin 15 'and a bore 28 to the Yerstellkolben I3. Sine bore 29 through the rotary valve 2 and a bore 30 through the reversing shaft 14 serve the outflow of the resulting leakage oil. The same task has a bore 3Ij from the bore of the piston-longitudinal slide 17 through the ümsteuerwelle 14 leader. The through the hydraulically active surfaces of the driving pins 15, 15 ', I5 ^i! , 1S ₅ 16 ⁵ resulting axial thrust is absorbed by a sliding washer 32.

The effect is the following?

With supply of S ¹ IuId via the pipe connection 8 this passes through the Hingnut 3 and a (not shown) channel to the control groove 5 and at the same time in the on the circumference of the rotary valve 2 the pressure equalization grooves 5s 7 opposite pressure equalization grooves (not visible). From the lying on the back of Druckausgleichsnut 7 Druckausgleichsnut the bore 25 leads to the pierced driving pin 16 so that the fluid passes through the formed by the piston longitudinal slide I7 in its bore, the pierced driving pin 15 ^f and the bore 28 to Yerstellkolben I3. This is thereby held in its drawn outer end position, wherein the control fluid flow ^ Xöer holds the bore 22 against the force of the spring 18, the Koibenlängsschieber I7 in the drawn end position.

If the Ixzentrizitätsiage the radial piston motor to be changed, the supply of the control fluid flow is interrupted. The spring 18 shifts the piston longitudinal slide 17 in its other end position, whereby the Hohrleitimgs- the

Connection 8 coming Sluidstrom over the pierced driving pin 15 and the bore 27 to the adjusting piston 12 passes. The adjusting piston 12 moves in its outer end position, while the adjusting piston I3 is moved by the abutting on both eccentric 33 inward. The thereby flowing back from the piston chamber of the adjusting piston I3 5 ¹ IuId passes over the. Bore 28, the driving pin 15 ^J j the liingraum the piston longitudinal slide I7, the driving pin 15 'and the bore 25 ^f to the pressure equalization 7 and from there finally to SohrIeitungsanschluß 9 ·

When changing the direction of rotation of the radial piston engine JTüidzufuhr via the Hohrleitungsanschluß 9 and the Hohrieitungsanschluß 8 is the sequence »The control operations for changing the displacement volume by changing the eccentricity are analogous to those described above,

Claims (5)

Srfinaungsanspruch 1 · Adjustment for Radialkoibenmaschinen with variable Yerdrängungsvoiuinen by changing the eccentricity of a rotating with the shaft Exaenterringes arranged in the shaft, hydraulically acted Yerstellkolben, while controlling the Fluidzu- and -ablaufs for itself on your Sxzenterring supporting working piston by a rotationally symmetric, with The output shaft synchronously circulating distributor body, preferably rotary valve, is carried out, characterized in that the 3? luiddreh ~ durchfiihrung between the control housing (1) of the radial piston engine and the rotary valve (2) at the same time the 'rotary feedthrough for the 5 ¹ IuId for acting on the adjusting piston (12 , 13) in the shaft (11). 2 »Yerstelleinrichtung according to item 1, characterized in that between the rotary valve (2) and shaft (11) rotatably connected to these a reversing shaft (14) is arranged in the sur-control of the line connections between the rotary valve (2) and the adjusting piston ( 12, 13) is an externally operated with a low control pressure 7 / egeventil. 3 "Yerstelleinrichtung according to item 1 and 2, characterized in that the acted upon by a control pressure directional control valve on the other hand by a ed eder (18) acted Kolbenlängs- slide (17) is the J'luidzuführungen of the rotary valve (2) and fluid discharges to the shaft (11) Drilled and sealed driving bolts (1 $, I; ¹ , 16, 15 ') are used to arrange the rotary motion of the shaft (11), the control shaft (14) and the rotary valve (2). 4 β adjusting device according to items 1 to 3? characterized in that the rotary valve (2) on both sides of the control grooves (5) Druckausgleichsnuten (6, 7) and preferably from the ümsteuerwelle (14 ·) associated Druckausgleichsnut (7), the fluid flow to act on the Yerstellkolben (12, 13) via holes (25, 25 ^f ) is tapped. 5. adjusting device according to item 1 to 4, characterized in that on the reversing shaft (14 ·) opposite side of the rotary valve (2) in the control housing (1) an axial sliding washer (32) is arranged t.