Axial piston machine having integral counting perforation

Abstract

An inclined-axis axial piston machine includes a housing, a drive shaft and a cylinder barrel. The drive shaft is mounted in the housing so as to be rotatable with respect to a first axis of rotation and is integral with a flange. Each piston is coupled to the flange via a ball joint. A multiplicity of counting perforations are arranged in a periodically distributed and continuous manner over an outer circumferential surface of the flange. The housing accommodates a sensor arranged opposite the counting perforations such that rotation of the drive shaft causes a signal change at the sensor. Each counting perforation is formed integrally from the flange, in the form of a recess having a single continuous perimeter. A side wall of the recess, starting from the perimeter, extends uninterruptedly, without sharp bends or offsets, over the entire circumference of the perimeter.

Claims

1. An inclined-axis axial piston machine comprising: a housing; a drive shaft mounted in the housing so as to rotate about a first axis of rotation; a cylinder barrel having a second axis of rotation with a position that is settable or fixed such that the second axis of rotation intersects the first axis of rotation at an angle other than zero, the drive shaft being connected to the cylinder barrel so as to rotationally drive the cylinder barrel; a flange that is integral with the drive shaft; a plurality of pistons arranged in the cylinder barrel in a linearly movable manner substantially along the second axis of rotation, each piston of the plurality of pistons being coupled to the flange via a ball joint; a multiplicity of counting perforations arranged in a periodically distributed and continuous manner over an outer circumferential surface of the flange; a sensor accommodated in the housing and arranged opposite the counting perforations such that rotation of the drive shaft causes a signal change at the sensor, wherein each counting perforation is formed integrally from the flange as a recess, each recess having a single continuous perimeter and a side wall that extends uninterrupted over an entire circumference of the perimeter so as to form a continuous and partially curved side wall surface extending around the entire circumference of the perimeter.

2. The axial piston machine according to claim 1, wherein the multiplicity of counting perforations are identical to each other.

3. The axial piston machine according to claim 1, wherein the multiplicity of counting perforations are configured as elongate holes.

4. The axial piston machine according to claim 1, wherein the counting perforations have at least one of a constant width and a constant depth.

5. The axial piston machine according to claim 1, wherein the perimeter is formed as an edge.

6. The axial piston machine according to claim 1, wherein the perimeter is one of chamfered and rounded.

7. The axial piston machine according to claim 1, wherein a first section of the side wall and a second section of the side wall are parallel to one other and parallel to a plane that includes the first axis of rotation.

8. The axial piston machine according to claim 1, wherein the side wall surface includes a first flat section and a second flat section, the first and second flat sections being connected to one another by two at least partially curved sections.

9. An inclined-axis axial piston machine comprising: a housing; a drive shaft mounted in the housing so as to rotate about a first axis of rotation; a cylinder barrel having a second axis of rotation with a position that is settable or fixed such that the second axis of rotation intersects the first axis of rotation at an angle other than zero, the drive shaft being connected to the cylinder barrel so as to rotationally drive the cylinder barrel; a flange that is integral with the drive shaft; a plurality of pistons arranged in the cylinder barrel in a linearly movable manner substantially along the second axis of rotation, each piston of the plurality of pistons being coupled to the flange via a ball joint; a multiplicity of counting perforations arranged in a periodically distributed and continuous manner over an outer circumferential surface of the flange; a sensor accommodated in the housing and arranged opposite the counting perforations such that rotation of the drive shaft causes a signal change at the sensor, wherein each counting perforation is formed integrally from the flange as a recess, each recess having a single continuous perimeter and a side wall that extends uninterrupted around an entire circumference of the perimeter so as to form a smooth and continuous side wall surface extending around the entire circumference of the perimeter, and wherein the recesses are defined by a bottom surface that has flat sections, the flat sections being arranged in an inclined manner relative to each other.

10. The axial piston machine according to claim 9, wherein the flat sections of the bottom surface include two directly adjacent flat sections that are inclined relative to one other at an angle other than zero.

11. The axial piston machine according to claim 9, wherein the flat sections of the bottom surface are inclined in relation to each other such that the bottom surface defines an overall convex floor surface.

12. The axial piston machine according to claim 9, wherein a section of the outer circumferential surface that is circular-cylindrical or circular-conical with respect to the first axis of rotation is assigned to each respective flat section, each respective flat section of the bottom surface being arranged parallel to the section of the outer circumferential surface assigned to the respective flat section.

13. An inclined-axis axial piston machine comprising: a housing; a drive shaft mounted in the housing so as to rotate about a first axis of rotation; a cylinder barrel having a second axis of rotation with a position that is settable or fixed such that the second axis of rotation intersects the first axis of rotation at an angle other than zero, the drive shaft being connected to the cylinder barrel so as to rotationally drive the cylinder barrel; a flange that is integral with the drive shaft; a plurality of pistons arranged in the cylinder barrel in a linearly movable manner substantially along the second axis of rotation, each piston of the plurality of pistons being coupled to the flange via a ball joint; a multiplicity of counting perforations arranged in a periodically distributed and continuous manner over an outer circumferential surface of the flange; a sensor accommodated in the housing and arranged opposite the counting perforations such that rotation of the drive shaft causes a signal change at the sensor, wherein each counting perforation is formed integrally from the flange as a recess, each recess having a single continuous perimeter and a side wall that extends uninterrupted around an entire circumference of the perimeter so as to form a smooth and continuous side wall surface extending around the entire circumference of the perimeter, wherein a first section of the side wall and a second section of the side wall are parallel to one other and parallel to a plane that includes the first axis of rotation, and wherein a third section of the side wall and a fourth section of the side wall are each formed as half of a circular cylinder having a central axis of that intersects the first axis of rotation, the first, second, third and fourth section of the side wall arranged such that, taken together, the first, second, third, and fourth sections form the side wall as a continuous wall.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The disclosure is explained in greater detail in the following on the basis of the appended drawings. There are shown:

(2) FIG. 1 a cross section of an axial piston machine according to the disclosure;

(3) FIG. 2 a partial cross section of the flange of the axial piston machine according to FIG. 1; and

(4) FIG. 3 a partial side view of the flange according to FIG. 2.

DETAILED DESCRIPTION

(5) FIG. 1 shows a cross section of an axial piston machine 10 according to the disclosure. The axial piston machine 10 has a housing 20, which is composed of a first and a second housing part 21; 22. The two housing parts 21; 22 are each of a pot-type design, and are assembled on their open side, such that they surround a closed interior.

(6) A drive shaft 30 is mounted in the first housing part 21 so as to be rotatable with respect to a first axis of rotation 31. Provided for this purpose are a first and a second rotary bearing 34; 35, which in the present case are realized as tapered roller bearings. The second housing part 22 accommodates a cylinder barrel 50 that is rotatable with respect to a second axis of rotation 51. The second axis of rotation 51 intersects the first axis of rotation 31 at an angle other than zero. In the present case, the position of the second axis of rotation 51 is predetermined by a spherical surface on the domed control plate 54 and on the centering piston 55, which engages in the cylinder barrel 50. However, this arrangement can also be used for axial piston machines in which the position of the second axis of rotation 51 is continuously adjustable.

(7) Accommodated in the cylinder barrel 50 are a plurality of pistons 52, which are movable longitudinally in the direction of the second axis of rotation 51, and which are each coupled, via a ball joint 53, to a flange 32 on the drive shaft 30. When the drive shaft 30 is made to rotate, the pistons 52 execute a reciprocating motion in their respectively assigned cylinder bore 56 in the cylinder barrel 50.

(8) The flange 32 is integral with the rest of the drive shaft 30, and is arranged at the end of the drive shaft 30 that faces toward the cylinder barrel 50. Its outer circumferential surface 33, away from the counting perforations 60, is rotationally symmetrical with respect to the first axis of rotation 31. It is composed, in particular, of a circular-cylindrical section and a plurality of circular-conical sections.

(9) A sensor 11 is fixedly mounted in the housing 20. The sensor 11 preferably operates inductively, the drive shaft 30, with the counting perforations 60, preferably being composed of steel. The sensor 11 is opposite the counting perforations 60, separated by a small distance, such that the counting perforations moving past the sensor 11 cause a signal change at the sensor 11, from which the rotational speed, or rotary position, of the drive shaft 30 can be determined.

(10) The drive shaft 30 protrudes from the housing 20 with a drive pin 36, via which it can be brought into rotary drive connection with a drive motor or with a device to be driven. This axial piston machine is preferably operated as a hydraulic motor.

(11) FIG. 2 shows a partial cross section of the flange 32 of the axial piston machine 10 according to FIG. 2. It shows the spherical cap of the ball joint 53, into which the ball on the piston is mounted.

(12) The outer circumferential surface 33 of the flange 32 has a first section 37, which is realized in the form of a circular cylinder with respect to the first axis of rotation (number 31 in FIG. 1). Directly adjacent to the first section 37 is a second section 38, which is realized in the form of a circular cone with respect to the first axis of rotation 31.

(13) Each individual counting perforation 60 is realized as a recess 61, which is preferably produced by means of an end mill 90. The axis of rotation 91 of the end mill 90 in this case runs in a plane that includes the first axis of rotation, and is aligned perpendicularly in relation to the assigned section 37; 38 of the outer circumferential surface 33. Accordingly, the first and the second section 71; 72 of the bottom surface 70 are each aligned parallel to the assigned section 37; 38 of the outer circumferential surface 33. The depth 64 of the recess 61 is accordingly constant.

(14) The production of the recess 61 is effected in two cuts, of which the direction of advance in each case is denoted by an arrow 92. The advance is effected from the centre of the recess 61 toward the semicircular-cylindrical end of the recess 61. The end mill 90 in this case is moved outside of the flange, to the level of the respectively first or second section 71; 72 of the ground surface 70 to be produced, and it is then moved only in the direction of advance 92, in order to mill the recess 61. With this course of cut, there is no risk of burrs at the recess 61, as the end mill 90 is moved only perpendicularly in relation to its axis of rotation 91. In particular, it does not execute any drilling movement in the direction of its axis of rotation 91 while cutting into the material of the flange 32.

(15) The result is a recess having a single continuous perimeter 62, the perimeter 62 having a sharp bend only where the first and the second section 71; 72 of the bottom surface 70 are directly adjacent to each other.

(16) FIG. 3 shows a partial sectional view of the flange 32 according to FIG. 2. The direction of view in this case is perpendicular to the first axis of rotation, the outer circumferential surface 33 being shown in a developed representation.

(17) The figure shows the elongate-hole type shape of the recesses 61, which are identical to each other, and which are arranged with a periodic distribution over the circumferential surface 33. The side wall 80 of the recess 61 has a first, a second, a third and a fourth section 81; 82; 83; 84. The first and the second section 81; 82 are each flat and parallel to each other, such that the recess 61 has a constant width 63. The third and the fourth section are each realized as semicircular cylinders, according to the shape of the end mill. Overall, the result is a side wall 80 that has no sharp bends or offsets over its entire circumference.

(18) Visible on the bottom surface 70 of the recess 61 is the straight boundary line 73, at which the first and the second section 71; 72 of the bottom surface 70 are directly adjacent to each other at an angle other than zero.

REFERENCE NUMERALS

(19) 10 axial piston machine

(20) 11 sensor

(21) 20 housing

(22) 21 first housing part

(23) 22 second housing part

(24) 30 drive shaft

(25) 31 first axis of rotation

(26) 32 flange

(27) 33 outer circumferential surface

(28) 34 first rotary bearing

(29) 35 second rotary bearing

(30) 36 drive journal

(31) 37 first section of the outer circumferential surface

(32) 38 second section of the outer circumferential surface

(33) 50 cylinder barrel

(34) 51 second axis of rotation

(35) 52 piston

(36) 53 ball joint

(37) 54 domed control plate

(38) 55 centering piston

(39) 56 cylinder bore

(40) 60 counting perforation

(41) 61 recess

(42) 62 perimeter

(43) 63 width of a counting perforation

(44) 64 depth of a counting perforation

(45) 70 bottom surface

(46) 71 first section of the bottom surface

(47) 72 second section of the bottom surface

(48) 73 boundary line

(49) 80 side wall

(50) 81 first section

(51) 82 second section

(52) 83 third section

(53) 84 fourth section

(54) 90 end mill

(55) 91 axis of rotation of the end mill

(56) 92 direction of advance of the end mill