EP1251271A2 - Variable capacity axial piston machine with inclination angle sensor - Google Patents

Abstract

The invention relates to an axial piston machine (1) with an inclined axis design with a cylinder drum (8) which is rotatably mounted in a housing (2) about its longitudinal central axis (8a) and has piston holes (11) distributed over its circumference, in which pistons ( 12) are displaceably mounted to and fro and are supported in an articulated manner on a drive pulley (3) which is also mounted in the housing (2), the cylinder drum (8), with its end face facing away from the drive pulley (3), being in contact with a control part (25) which is connected to the cylinder drum (8) is mounted in the housing (2) by an adjusting device (26) so as to be pivotable about a transverse pivot axis (9), and the adjusting device (26) has an adjusting slide (34) which in the control part (25) The adjacent housing wall (2b) is mounted such that it can be moved back and forth transversely to the longitudinal central axis (8a) of the cylinder drum (8) and is in drive connection with the control part (25), and a swivel angle measuring device (43) with a swivel angle sensor (44) is provided. In order to achieve a construction which is particularly favorable in terms of production technology, the sensor (44) or an adjusting part which interacts with it is in a drive connection with the adjusting slide (34).

Description

The invention relates to an axial piston machine according to the preamble of claim 1.

An axial piston machine of this type is in DE 40 22 301 C1 described. In this known axial piston machine are a plurality of pistons in a cylinder drum back and forth forth slidably mounted around one to her Rotating axis pivot axis pivotable in the housing of the Axial piston machine is mounted, the pistons on one rotatably mounted drive pulley are supported. On Swivel angle sensor is the with respect to the swivel plane Cylinder drum arranged on the side of the housing, with a extending perpendicular to the swivel plane and in its longitudinal direction back and forth slidably Stylus penetrates the housing in a through hole and with a lateral inclined surface of a control part interacts. In this known axial piston machine is not directly used when determining the swivel angle Swivel movement is determined, but it is first the Swiveling movement in an axial movement of the stylus converted and the axial movement of the stylus determined. This not only leads to a large construction effort, but it there is also a reduction of the movement, so that the Deriving a signal from this movement is difficult.

The invention has for its object a Axial piston machine of the type specified above to design that a construction method is achieved that Favorable in particular for reasons of manufacture and assembly is. According to another aspect, for a swivel angle determination the pivoting movement of the cylinder drum without Movement conversion can be exploited.

This object is achieved by the features of claim 1 or of claim 7 solved. Advantageous further developments of Invention are described in the subclaims.

In the axial piston machine according to the invention 1, the sensor acts directly or indirectly with the Adjustment slider of the adjustment device together. This Design is characterized by a particularly simple Construction because of the sensor with a component interacts that the cylinder drum indirectly or immediately pivoted and thus for the adjustment movement is the cause. Another advantage of this design is that the measuring device or the sensor in Area of the adjusting slide is arranged in the the sensor can be advantageously integrated. With usual Axial piston machines is the adjustment slide in the cover part a pot-shaped housing, which is also ideally suited to accommodate the sensor. A advantageous location for the sensor is that of Cylinder drum facing away from the cover part, from the the sensor can stick out without significantly disturbing the To affect installation space. This cover part needs a processing in which the design features of the Measuring device rationally trained or prefabricated can be.

The sensor or the pivoting part can be as related to them Swivel axis symmetrical parts are formed. hereby not only a simple construction is achieved, but it can also use round or ring-shaped components for the Derivation of the respective swivel angle representative signal used by the pivoting movement be, e.g. B. electrical coils.

The object underlying the invention is also achieved by solved the features of independent claim 7. Advantageous developments of the invention are in related subclaims described.

The sensor is in the axial piston machine according to the invention opposite the cylinder drum on one of the two Sides arranged transversely to the swivel plane are, the sensor through a with the cylinder drum cooperating distance sensor is formed. hereby the swivel movement can be used directly. The Design according to the invention is also characterized by a simple and inexpensive to manufacture. A mechanical connection between the sensor and the Cylinder drum is not required because the sensor detects the Distance between him and the cylinder drum determined.

It is for the sake of easy assembly or disassembly advantageous, the sensor on the outside or outside of the housing order accessible. It is for the purpose of increasing the Sensitivity or performance advantageous in Area of the sensor has a hole in the wall of the housing to provide through which the sensor is effective. The Sealing the hole can be through the body of the sensor or of a receiving housing itself, which the Hole edge covered from the outside. To attach the sensor to a screw connection is suitable for the wall of the housing excellent, e.g. B. a hole-forming threaded hole.

It is also advantageous to use a sensor that on markings arranged on the circumference of the cylinder drum responded to the delivery of signals. The markings can e.g. B. be formed by notches or teeth. Such a sensor is also suitable for determining the circumferential path or Speed detection. The signals from the sensor become one of the Axial piston machine associated electrical Control device transmitted and from this as the actual value of each swivel angle position for regulating the throughput, performance or working pressure with one Flow controller, a power controller or a Pressure regulator used.

Fig. 1 eine erfindungsgemäße Axialkolbenmaschine im axialen Schnitt;

Fig. 2 den Teilschnitt II - II in Fig. 1;

Fig. 3 eine erfindungsgemäße Axialkolbenmaschine im axialen Schnitt in abgewandelter Ausgestaltung;

Fig. 4 die in Fig. mit IV gekennzeichnete Einzelheit in vergrößerter Darstellung;

Advantageous embodiments of the invention are explained in more detail below on the basis of preferred exemplary embodiments and drawings. Show it

1 shows an axial piston machine according to the invention in axial section;

Figure 2 shows the partial section II - II in Fig. 1.

3 shows an axial piston machine according to the invention in axial section in a modified embodiment;

Fig. 4 shows the detail marked IV in Fig. In an enlarged view;

The number 1 in its entirety Axial piston machine has a two-part housing 2, of which the one housing part 2a is cup-shaped and the other housing part 2b a cover for the Housing part 2a forms. In the area of the end wall 2c Pot-shaped housing part 2a is a drive shaft 3 in at least one pivot bearing rotatably mounted End wall 2c in a through hole 4 to the outside interspersed and through one in the through hole 4th arranged sealing ring 5 is sealed. At the Embodiment are for the purpose of stabilizing the Pivot bearing two pivot bearings 6 axially next to each other arranged, of which the axially outer pivot bearing 6 in Area of the outside z. B. tapered end wall 2c is arranged and is formed with a bearing bore 6a and the second pivot bearing 6 in the area of the front End region of the peripheral wall 2d with one on this trained bearing bore 6b is formed. Furthermore the pivot bearings 6 preferably have roller bearings, in particular opposed tapered roller bearings, on, who sit on cylindrical shaft sections whose Diameter increases axially inwards step by step.

In the cavity 7 of the housing 2, the drive shaft 3 is axial opposite a cylinder drum 8 about its drum axis 8a rotatably and pivotably about a transverse axis 9, the a plurality arranged on a pitch circle Has cylinder bores 11 that toward the drive shaft 3 are open, and in which piston 12 is axially displaceable are mounted axially on the drive shaft 3, here on a Drive shaft flange 3a, are supported. It is one Rotary drive connection between the drive shaft 3 and the Cylinder drum 8 available in the embodiment is formed by the piston 12 with their spherical piston heads 14 in spherical spherical caps 15 of the drive flange 3a are pivotally mounted. By a the restraining device 16 engaging behind the ball heads 14, the z. B. is formed by a screwed-on perforated plate, the piston heads 14 are held axially in the spherical caps 15.

The cylinder drum 8 is coaxial with it trained bearing pin 17 which - like the pistons 12 - with a spherical bolt head 18 in one coaxial dome 19 is held positively. The Bearing pin 17 sits in a coaxial stepped bore 21 in the cylinder drum 8. Between step surfaces 22, 23 of the Bearing pin 17 and the cylinder drum 8 is one Compression spring 24 arranged and effective, which the Cylinder drum 8 along its central axis 8a to that of Drive shaft 3 facing away from the axial side against a control part 25 acted upon by an adjustment drive 26 in the Pivot plane is pivotally mounted about the pivot axis 9, here in a in the pivot plane in the housing part 2b extending guide groove 27, the base 27a a is concave cylinder section surface on which the control part 25 with a correspondingly convex bearing sliding surface 25a is applied. The facing end faces of the Cylinder drum 8 and the control part 25 lie with Guide surfaces 28a, 28b to each other, the shapes of deviate from a radial plane of the longitudinal central axis 8a and at Embodiment formed by spherical section surfaces are. The guide surface 28a of the cylinder drum 8 can be concave and the guide surface 28b of the Control part 25 can be convex. The Piston bores 11 are through the cylinder drum 8 and that Control section 25 penetrating channel sections with a Supply line or a discharge line connected, which are in the embodiment in the housing part 2b extend. The formation of the channel sections is in itself known and therefore need not be described in more detail become.

The adjusting device 26 is in the embodiment through an adjusting slide 34 and one of them across protruding and in a recess 35 in the control part 25 Movement game enclosing driving pin 36 formed preferably with a spherical bolt head 37 in the z. B. surrounds cylindrical recess 35 and thus in terms of the control part 25 different tilt positions with the Control part 25 can be effective. The adjustment slide 34 is through a drive in its longitudinal direction back and forth displaceable. This can be, for. B. one hydraulic drive with a hydraulic Adjusting cylinders act for simplicity is not further described. The driving pin 36 passes through the material area of the housing part 2b between a guide channel 38 for the adjusting slide 34 and cylindrical section-shaped base 27a for the control part 25 in a slot extending in the pivot plane 41st

To limit the pivoting movement, the housing 2 Control part 25 opposite on the sides of the housing Two stops 42a are arranged transversely to the pivot plane, 42b provided against which the control part 25 with its Circumferential surface abuts. The stops 42a, 42b are adjustable and preferably formed by adjusting screws made by outside in corresponding obliquely arranged threaded holes screwed in and each by one on the outside of the Wall of the housing 2 adjacent nut are countered.

The axial piston machine 1 has a measuring device 43 a swivel angle sensor 44 for determining the Swivel angle on the cylinder drum 8 and that Control part 25, which is a swivel unit in functional operation form, take. The swivel angle is thus between the Longitudinal central axis 8a and the axis of rotation 3b included.

1 are the measuring device 43 and the sensor 44 in the area of the control part 25 adjacent housing wall, here the lid-shaped Housing part 2b, arranged, the sensor 44 with the Adjustment slide 34 cooperates.

For operative connection between the adjusting slide 34 and the Sensor 44 may be provided with a lever arm 46 free end through a transverse to the adjusting slide 34 directional slide guide 47 with the adjusting slide 34 connected is.

In the embodiment, the sensor 44 is on the Control part 25 facing away from the adjusting slide 34 containing housing part 2b arranged. The lever arm 46 can be rigid with the sensor 44 or an adjustment or Be pivoted part 48 connected to the sensor 44th interacts. The sensor 44 or the swivel part 48 can be mounted or arranged in an attachment 49, the on the housing part 2b attachable, for. B. screwable, and a feed-through slot 51 for the lever arm 46 in Housing part 2b covers and seals. In the extension of the feed-through slot 51 is in the attachment part 49 Cavity 51a in which the lever arm 46 of the Follow longitudinal movement of the adjustment slide 34 and back and forth can swing here. In the embodiment, the Lever arm 46 rotatably connected to a shaft 52 which in There is an active connection with the sensor 44 which is in the attachment part 49 can be arranged or attached to the attachment 49, z. B. screwed, can be, as shown in Fig. 2. The shaft 52 can only be arranged in one half of the attachment part 49. In the other half of the attachment part 49 can be approximately coaxial a closable opening, e.g. B. a threaded hole, be provided by a screw plug 54 is closed.

In the exemplary embodiment, the link guide 47 is between the lever arm 46 and the driving pin 36 are formed. As a result, the adjusting slide 34 is of an additional type Training for the active connection and the Design features in question are on bolt head 37 opposite end of the driving pin 36 formed at which is on the one hand a small one on the other a Component acts on which the concerned Design features made simple and inexpensive can be. In the embodiment, the Driving pin 36 a backdrop recess 55 in the with little movement play at the free end of the lever arm 46 arranged correspondingly rounded driver head 46a so surrounds that with a longitudinal movement of the adjusting slide 34 the lever arm 46 and the pivoting part 48 or the sensor 44 a pivoting movement about the pivot axis 52a of the shaft 52 To run.

3 and 4, in the same or comparable components with the same reference numerals are designated, the sensor 44 is on the peripheral wall of the Housing 2 attached, in one of the cylinder drum 8 laterally opposite position at one of the two sides of the housing, arranged transversely to the swivel plane are. In the exemplary embodiment, the sensor 44 is located on the side of the housing 2, on which the Cylinder drum 8 in the zero position or in the position lowest throughput volume closest to sensor 44 located. The sensor 44 is next to the stop 42a arranged and acts with the circumference of the cylinder drum 8, here with the peripheral edge region facing away from the control part 25 the cylinder drum 8 together. The sensor 44 is detachable attached and preferably mountable from the outside and removably attached to the housing 2, preferably by a Screw connection. In the exemplary embodiment, the sensor 44 has a threaded bolt 44a, with which it can be screwed in from the outside Threaded hole in the peripheral wall 2d of the housing 2 screwed and by a on the threaded bolt 44a screwed nut 44b countered countered.

The sensor 44 is a distance sensor, which is the longitudinal distance from The circumference of the cylinder drum 8 measures. The measurement result will an existing electrical control device for control the adjusting device 26 transmitted as a signal that as Actual value for controlling an existing control device is used, e.g. B. in a power controller, a Flow regulator or a pressure regulator.

Within the scope of the invention, the sensor 44 can be such Be a sensor that only or possibly in addition to its distance measurement on markings 45 on the Cylinder drum 8 reacts and thus circumferential distances Can determine cylinder drum 8 and as a speed sensor can work. With this configuration generates the sensor 44 in the rotational mode of the Axial piston machine 1 due to the moving past it differences caused by the markings 45 signals, from the electrical control device to Speed measurement can be used. If the sensor 44 both can be a distance sensor at the same time Signals determined simultaneously and the control device be transmitted. Such a distance sensor and / or the Differences in the rotation of the cylinder drum 8 determining sensor 44 is known per se and does not need to be described further. The signals can e.g. B. by the detection of magnetic field changes are generated, which when penetrating the markings 45 one of the Sensor 44 associated magnetic field result. The sensor 44 may also have a photosensitive member which differences in light caused by the markings 45 perceives. The markings 45 can e.g. B. by one or several elevations which follow one another in the circumferential direction and wells z. B. formed in the form of notches that preferably in the longitudinal direction of the cylinder drum 8 are elongated so that when swiveling the Cylinder drum 8 resulting longitudinal movements of the Measuring points are harmless.

Claims (14)

Axial piston machine (1) in inclined axis design with a cylinder drum (8) which is rotatably mounted about its longitudinal central axis (8a) in a housing (2) and has piston holes (11) distributed over its circumference, in which pistons (12) back and forth forth displaceably and are articulated on a drive pulley (3) also mounted in the housing (2), the cylinder drum (8) with its end facing away from the drive pulley (3) abutting a control part (25) with control channels, which is connected to the cylinder drum (8) is pivotally mounted in the housing (2) by an adjusting device (26) about a first transverse pivot axis (9), the adjusting device (26) having an adjusting slide (34) which is located in the housing wall adjacent to the control part (25) (2b) transversely to the longitudinal center axis (8a) of the cylinder drum (8) is slidably mounted and in drive connection with the control part (25), and wherein a swivel angle measuring device (43) with a swivel angle sensor (44) is provided,
characterized in that the sensor (44) or an adjusting part (48) cooperating with the sensor (44) is in drive connection with the adjusting slide (34). Axial piston machine according to claim 1,
characterized in that the sensor (44) or the adjusting part (48) are mounted so as to be pivotable about a second pivot axis (52a) which extends essentially at right angles to the pivoting plane of the cylinder drum (8). Axial piston machine according to claim 2,
characterized in that the sensor (44) or the adjusting part (48) can be pivoted by a lever arm (46) which is connected to the adjusting slide (34) by a link guide (47) in a pivoting drive connection. Axial piston machine according to one of the preceding claims,
characterized in that the sensor (44) and the adjusting part (48) are arranged on the side of the adjusting slide (34) facing away from the control part (25), in particular on the outside of the housing wall (2b) receiving the adjusting slide (34). Axial piston machine according to claim 3 or 4,
characterized in that the adjusting slide (34) is in drive connection with the control part (25) by a driver pin (36) projecting therefrom and the link guide (47) is arranged between the lever arm (46) and the end of the driver pin (36), that faces away from the control part (25). Axial piston machine according to one of the preceding claims,
characterized in that the sensor (44) and / or the adjusting part (48) is or are arranged in an add-on part (49) which seals a lead-through slot (51) in the housing wall (2d) for the lever arm (46). Axial piston machine (1) in inclined axis design with a cylinder drum (8) which is rotatably mounted about its longitudinal central axis (8a) in a housing (2) and has piston holes (11) distributed over its circumference, in which pistons (12) back and forth forth displaceably and are articulated on a drive pulley (3) which is also mounted in the housing (2), the cylinder drum (8) with its end face facing away from the drive pulley (3) abutting a control part (25) which has control channels and which engages with the cylinder drum (8) is pivotally mounted in the housing (2) by an adjusting device (26) about a transverse pivot axis (9), and a pivot angle measuring device (43) is provided with a pivot angle sensor (44) which is attached to the housing ( 2) is arranged
characterized in that the sensor (44) of the cylinder drum (8) is arranged opposite one of the two housing sides, which extend transversely to the pivot plane, and is formed by a distance sensor which interacts with the cylinder drum (8). Axial piston machine according to claim 7,
characterized in that the sensor (44) is attached to the outside of the housing (2). Axial piston machine according to claim 7 or 8,
characterized in that the housing wall (2d) carrying the sensor (44) has a hole in the area of the sensor (44) which is sealed by the sensor (44) or an attachment part thereof. Axial piston machine according to claim 9,
characterized in that the sensor (44) penetrates the wall (2d) of the housing (2) inwards in the hole. Axial piston machine according to claim 9 or 10,
characterized in that the hole is a threaded hole and the sensor (44) or a carrier thereof is screwed into the threaded hole. Axial piston machine according to one of the preceding claims 7 to 11,
characterized in that the sensor (44) interacts with markings (45) arranged one behind the other in the circumferential direction on the cylinder drum (8) and which are preferably elongate in the longitudinal direction of the cylinder drum (8). Axial piston machine according to claim 12,
characterized in that the markings (45) are arranged on the outer surface of the cylinder drum (8). Axial piston machine according to claim 12 or 13,
characterized in that the markings (45) are formed by notches.

Images