DK158920B - HYDRAULIC ROTATION STAMP MACHINE - Google Patents

Description

DK 158920 B

The invention relates to a hydraulic rotary piston machine as set forth in the preamble part of claim 1.

Such rotary piston machines can be used as motor, pump, control unit, control aid or the like.

5 For the known machines of this kind (compare, for example, with DE-AS 21 55 818}, the distance between the orbiting and if necessary rotating machine part and the end surface cooperating with the input shaft of the main shaft must be relatively large because the shaft mounted in the housing must At a shorter cardan shaft, it assumes such a large angle with respect to the axis of the main shaft that, due to clamps and edge positions, operative nuisances appear, the predetermined distance resulting in a correspondingly large axial length of the housing. Furthermore, there is known a rotary piston machine (US-PS 4 334 843) in which a cardan shaft protrudes from the housing, which is not connected to a rotatable main shaft with an external clutch.

SUMMARY OF THE INVENTION The object of the invention is to provide a rotary piston machine of the kind described in the preamble, in which a short outer portion of the main shaft and a substantial axial shortening of the main shaft bearing block can be obtained while retaining a shortened piston shaft.

This task is solved according to the invention as set forth in the characterizing part of claim 1.

25 The total length of the main shaft is practically available for the positioning of the universal shaft. Therefore, a cardan shaft of sufficient length can be arranged using a short outer section of the main shaft. As a result, no operational nuisance occurs due to 30 clamps and edge positions. The short outer section has the effect that any cross-force attack on the main shaft

DK 158920 B

2 ter affects a small lifting arm, so that the bearing section is loaded relatively lightly and therefore can also be kept short.

To enable practical use of the machine with the short main shaft, the shaft has an exterior clutch in the form of a 5 tooth. Due to the exterior coupling, there is no need to extend the outer section of the PTO shaft as the exterior coupling and inner coupling overlap. Since both the outer coupling and the inner coupling are provided with a tooth which, unlike a not-wedge coupling, has a slight radial extension, it is possible to maintain the external dimensions of the main shaft by maintaining the required main diameter of the universal shaft. frames so that usually rotating parts can be connected to the main shaft. In particular, one can construct axially 15 small houses.

In the further configuration according to claim 2, the least possible outer cross section of the outer section of the main shaft is obtained.

The trochoid tooth according to claim 3 provides an exactly equal wall thickness over the entire coupling area.

In the design as a pull-up part according to claim 4, the main shaft can be manufactured in a very simple manner with all necessary designs.

By means of the outer flange according to claim 5 an additional axial stiffening is obtained without the need for an extension of the main shaft and thus an extension of the housing. This flange can also be formed by pulling.

The invention is further explained below by means of preferred embodiments shown in the drawing which are shown in FIG. 1 is a longitudinal section through a rotary piston machine 30 according to the invention;

DK 158920 B

FIG. 2 is a longitudinal section through the main shaft and FIG. 3 is a section along the line III-III in FIG. 2nd

In the embodiment, it is a hydrostatic control device. An outer housing 1 comprises an end wall 2, 5 a casing 3, a valve plate 4, a duct plate 5, a duct plate 6, an intermediate plate 7 and a connection plate 8 held together by clamping screws 9. Some of the parts 4-7 , e.g., plates 4, 5 and 6, may be permanently connected to one another by soldering, welding or bonding. The connection plate 8 has five connections, of which a pump connection 10, a container connection 11 and a working motor-connection 12 are shown. Another working motor connection and an alternative with an additional working circuit or container-connected connection are outside the drawing plane. A 15 measuring motor 13 has an internally toothed ring 14 and an outer toothed gear 15 which forms displacement chambers 16 between them. The gear wheel 15 is connected over a universal shaft 17 to a main shaft 18, so that the gear wheel 15 forms not only a rotating, but also an orbiting machine part.

The main shaft 18 has a bearing section 19 which is mounted with its circumferential surface in a bore in the end wall 2 and supports a flange 20 over an axial bearing 21 on the end wall 2. Outside the housing 1 there is an outer section 22 which free end as external clutch 23 has an external tooth 25 on which, for example, an actuating handwheel or shaft extension piece can be mounted. The propeller shaft 17 extends through a cavity 24 in the main shaft, which cavity is closed at one end and which reaches into the outer section 22 and there has an internal tooth as internal coupling 25.

It communicates with a similarly toothed head 26 on the shaft 17. Similarly, a toothed head 26 'on the shaft 17 engages with an internal tooth 27 in the gear 15.

DK 158920 B

4

The main shaft 18 formed as a bowl-shaped casing is a pull-up part made of a small metal plate. The outer coupling 23 and the inner coupling 25 overlap and are each formed by a trochoid tooth with the same number of teeth. In this way, a constant wall thickness also appears in the coupling area. Due to the overlap of the two teeth, the axial length of the main shaft 18 is also small.

The tooth ring 14 together with an end wall 28, a distributor-10 valve plate 29, an intermediate plate 30 and a sliding valve plate 31 form a motor housing 32 held together by screws 33. Here, the plates 29-31 can also be permanently connected to one another. The valve plates 4 and 31 carry control openings which together form a directional valve 34 which in the neutral position connects the pump connection 10 to the container connection 11 and in both its working positions the pump connection over the measuring motor with one connection to a control working motor as well as its other connection with container. The distributor plate 29 and gear 15 also have guide apertures on their end faces 20, which together form a distributor valve 35 which, in proper order, fills and empties the displacement chambers 16. In a cavity 36 there is a device 37 having pivot limiting means and neutral position springs. Further details regarding the structure of the shown control device are shown in Danish patent application no. 5305/83. In particular, this shows the connection between the connections and the control openings from the directional valve and distributor valve as well as the structure of these valves.

If the main shaft 18 is rotated by means of an actuator 30, not only does the gears 15 be brought in, but, because the displacement chambers 16 are closed, also including the gears 14 and thus of the motor housing 32. As a result, the directional valve is set in the direction of rotation. specific direction. Pressure fluid now flows over the measuring motor 13

DK 158920 B

5 to the working motor, whereby the flow rate always corresponds to the angular speed of the main shaft 18.

Hereby, an unobstructed torque transmission from the main shaft 18 to the sprocket 15 occurs because the shaft 17 is 5 so long that the angle of inclination is sufficiently small with respect to the axis of the main shaft. Nevertheless, the orbiting sprocket 15 may be disposed at a relatively small distance from the outer side of the end wall 2.

While both the gear 14 and the gear ring 15 are movable with respect to the outer housing 1 in the illustrated steering gear 10, the notified construction also lends itself to simpler machines, such as pumps or motors, in which the main shaft over a PTO shaft is connected to a machine part. which orbits and in most cases also rotates about the axis of the main shaft 15 while the other machine part is stationary.

Claims (5)

A hydraulic rotary piston machine with a housing (1), a main shaft (18) having a bearing section (19) located in the housing (1) and an outer section (22) projecting from the housing (1), which bears an external coupling (23) for pivotally fixed connection with a further pivot member, a rotary piston moving eccentrically about the axis of the main shaft (18), and a propeller shaft (17) connecting piston and main shaft (18) pivotally projecting into a cavity (24) of the main shaft (18) and above 10 an internal coupling (25) having a toothed engagement with the main shaft (18), characterized in that the cavity (24) extends into it. outer section (22) and therein the inner coupling (25) has the main shaft (18) ending near the end of the cavity 15 and at its end carries the outer coupling (23), and the outer coupling has a tooth and overlaps the inner coupling axially. Machine according to claim 1, characterized in that the teeth of the outer coupling (23) and the inner coupling (25) have the same number of teeth and are arranged relative to each other such that the main shaft (18) in the overlap area on the perimeter has approximately unchanged wall thickness. Machine according to claim 1 or 2, characterized in that the internal and external teeth (23, 25) are each formed by a trochoid tooth. Machine according to one of Claims 1 to 3, characterized in that the main shaft (18) is a pull-up part with the shape of a bowl-shaped casing. DK 158920 B Machine according to one of claims 1-4, characterized in that the free end of the bearing section (19) carries an outer flange (20).