U.S. patent application number 12/521740 was filed with the patent office on 2010-12-23 for axial piston engine having a housing with a radially widened interior portion.
This patent application is currently assigned to ROBERT BOSCH GMBH. Invention is credited to Gerhard Betz, Herbert Dreher, Michael Duerr, Clemens Krebs.
Application Number | 20100322789 12/521740 |
Document ID | / |
Family ID | 39185893 |
Filed Date | 2010-12-23 |
United States Patent
Application |
20100322789 |
Kind Code |
A1 |
Betz; Gerhard ; et
al. |
December 23, 2010 |
AXIAL PISTON ENGINE HAVING A HOUSING WITH A RADIALLY WIDENED
INTERIOR PORTION
Abstract
The invention relates to a hydrostatic axial piston engine (1),
having a housing (2), which with two transverse walls (18a, 18b)
and a peripheral wall (2c) connecting these longitudinally to one
another surrounds an interior (3), a driving shaft (19), which
extends longitudinally in the housing (2) and is mounted rotatably
in the housing (2), and a swash plate (4), which is mounted
longitudinally adjacent to the cylinder drum (5) in the housing (2)
and supported against which in an articulated manner are pistons
(9) that are reciprocably mounted in approximately longitudinally
extending piston holes (6) in the cylinder drum (5). In order to
improve the axial piston engine (1) in terms of a spatially
advantageous shape, the peripheral wall (2c) has at least one
radial elevation (34a), which is constructed in an elongate manner
in the longitudinal direction of the housing (2) and which is
formed by two peripheral wall portions (2e), which are arranged in
an angular or U-shaped manner and delimit a radially widened
interior portion (36).
Inventors: |
Betz; Gerhard;
(Pfalzgrafenweiler, DE) ; Dreher; Herbert; (Horb,
DE) ; Krebs; Clemens; (Tuebingen, DE) ; Duerr;
Michael; (Horb-Betra, DE) |
Correspondence
Address: |
SCULLY SCOTT MURPHY & PRESSER, PC
400 GARDEN CITY PLAZA, SUITE 300
GARDEN CITY
NY
11530
US
|
Assignee: |
ROBERT BOSCH GMBH
Stuttgart
DE
|
Family ID: |
39185893 |
Appl. No.: |
12/521740 |
Filed: |
December 20, 2007 |
PCT Filed: |
December 20, 2007 |
PCT NO: |
PCT/EP2007/011302 |
371 Date: |
June 29, 2009 |
Current U.S.
Class: |
417/222.1 |
Current CPC
Class: |
F04B 1/145 20130101;
F04B 1/2064 20130101 |
Class at
Publication: |
417/222.1 |
International
Class: |
F04B 1/26 20060101
F04B001/26 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 29, 2006 |
DE |
10 2006 062 065.8 |
Claims
1. Hydrostatic axial piston engine, having a housing, which with
two transverse walls and a peripheral wall connecting these
longitudinally to one another surrounds an interior, a driving
shaft, which extends longitudinally in the housing and is mounted
rotatably in the housing, and a swash plate, which is mounted
longitudinally adjacent to the cylinder drum in the housing and
supported against which in an articulated manner are pistons that
are reciprocably mounted in approximately longitudinally extending
piston holes in the cylinder drum, wherein the peripheral wall has
at least one radial elevation, which is constructed in an elongate
manner in the longitudinal direction of the housing and which is
formed by two peripheral wall portions, which are arranged in an
angular or U-shaped manner and delimit a radially widened interior
portion.
2. Hydrostatic axial piston engine according to claim 1, wherein
the elevation extends over the length (L1) of the interior.
3. Hydrostatic axial piston engine according to claim 1, wherein
two elevations are disposed opposite one another or a plurality of
elevations, for example three or four, are disposed offset relative
to one another in the peripheral direction.
4. Hydrostatic axial piston engine according to claim 1, wherein
the cylinder drum with its inner side remote from the swash plate
rests against a cam disc disposed between it and a transverse wall
and the at least one elevation extends longitudinally also over the
transverse wall or over both transverse walls.
5. Hydrostatic axial piston engine according to claim 1, wherein in
the apex of the elevation a hydraulic connection point with a
connection opening is and/or are disposed.
6. Hydrostatic axial piston engine, having a housing, which with
two transverse walls and a peripheral wall connecting these
longitudinally to one another surrounds an interior, a driving
shaft, which extends longitudinally in the housing and is mounted
rotatably in the housing, and a swash plate, which is mounted
longitudinally adjacent to the cylinder drum in the housing and
supported against which in an articulated manner are pistons that
are reciprocably mounted in approximately longitudinally extending
piston holes in the cylinder drum, wherein, the cylinder drum rests
with its side remote from the swash plate against a cam disc
disposed between it and a transverse wall, wherein on the periphery
of this transverse wall a radial elevation with an angular or
U-shaped cross section is disposed, in the apex region of which a
hydraulic connection point with a connection opening is
disposed.
7. Axial piston engine according to claim 6, wherein the elevation
extends at least partially longitudinally also along the peripheral
wall or also along the other transverse wall.
8. Hydrostatic axial piston engine according to claim 5, wherein at
the hydraulic connection point fastening elements are disposed,
which are parts of a fastening device for fastening a hydraulic
line or a connection fitting.
9. Hydrostatic axial piston engine according to claim 8, wherein at
the connection point at least one, preferably flat, seating face is
provided.
10. Hydrostatic axial piston engine according to claim 8 wherein
the fastening elements are disposed on a second elevation that is
elevated from the first elevation, for example only in the region
of the connection point.
11. Hydrostatic axial piston engine according to claim 1, wherein
the throughput volume of the axial piston engine may be either
increased or decreased by means of an adjusting device having an
adjusting mechanism, and preferably the swash plate is mounted as
part of the adjusting device pivotably about an oriented swiveling
axis in a swivel joint.
12. Hydrostatic axial piston engine according to claim 11, wherein
the adjusting mechanism and/or a swivel-limiting device are/is of
an elongate design and extend/extends transversely offset in
relation to the swivelling axis in the longitudinal direction of
the axial piston engine in the widened interior portion or in one
of the widened interior portions.
13. Hydrostatic axial piston engine according to claim 1, wherein
one or two elevations having a transversely oriented mutual spacing
are disposed transversely offset in relation to the swivelling
axis.
14. Hydrostatic axial piston engine according to claim 12 wherein
two transversely mutually spaced-apart radial elevations with
widened interior portions are disposed on both sides of the
swivelling axis and preferably an adjusting mechanism and a
swivel-limiting device are disposed on each side of the swivelling
axis, in particular are disposed obliquely opposite one
another.
15. Hydrostatic axial piston engine according to claim 4, wherein
the transverse wall is formed by the base wall of a pot-type
housing.
16. Hydrostatic axial piston engine according to claim 1, wherein
the housing at least in the region of the at least one elevation
has a cross-sectional shape delimited by four side wall portions,
in particular a square or rectangular cross-sectional shape,
preferably with rounded corners.
Description
[0001] The invention relates to an axial piston engine according to
the preamble of claim 1 or 6.
[0002] An axial piston engine of this type is general prior art and
may be of different types, such as for example a so-called swash
plate engine or inclined axis engine, wherein these may be in each
case axial piston engines of variable or fixed throughput
volume.
[0003] In EP 0 450 623 A1 for example a swash-plate-type axial
piston engine with a variable throughput volume is described. DE
100 30 147 A1 discloses for example an inclined-axis-type axial
piston engine with a variable or fixed throughput volume.
[0004] What all engine types have in common is that the, in cross
section, round cylinder drum is disposed in a housing interior, the
housing peripheral wall of which surrounds the cylinder block with
an adequate radial clearance. For functional operation, the
interior is filled at least partially with the hydraulic medium, in
particular hydraulic oil, of the axial piston engine, namely at a
low-pressure.
[0005] In an attempt to save space and material, as low a
cross-sectional size as possible is to be observed for the housing.
For this reason, the peripheral wall of the housing surrounds the
cylinder drum with a sufficiently low radial clearance. Since as a
rule the cross-sectional shape of the cylinder drum is circular,
conventional housings have a substantially circular and/or
hollow-cylindrical cross-sectional shape. In axial piston engines
of variable throughput volume, it is known to dispose elongate and
for example paraxially arranged adjusting devices in chambers of
wall thickenings of the housing, which are connected by channels to
the interior.
[0006] The underlying object of the invention is to improve an
axial piston engine of the initially indicated type in terms of a
spatially advantageous shape of its housing. Furthermore, an at
least spatially advantageous hydraulic connection point of the
axial piston engine to a hydraulic circuit and/or to a leakage port
is to be achieved. A further object is to realize a spatially
advantageous arrangement of parts of an adjusting device for
varying the throughput volume of the axial piston engine.
[0007] This object is achieved by the features of claim 1 or 6.
Advantageous developments of the invention are described in the
sub-claims.
[0008] The invention is based on the discovery that a radial
widening of the housing of the axial piston engine offers spatially
advantageous arrangement- and/or design options both internally and
externally.
[0009] According to claim 1 the peripheral wall has at least one
radial elevation, which extends in an elongate manner in the
longitudinal direction of the driving shaft and which is formed by
two peripheral wall portions, which are disposed in an angular or
U-shaped manner and delimit a radially widened interior portion. On
the one hand, this creates a radially widened interior portion that
is available for the disposition of additional parts of the axial
piston engine, for example parts of an adjusting device for
decreasing or increasing the throughput volume of the axial piston
engine, wherein these parts may be adjusting elements for adjusting
the throughput volume or stop elements for limiting an adjusting
movement.
[0010] In addition or independently thereof, the peripheral wall
portions that delimit the widened interior portion offer, in the
region of the apex of the radial elevation they form, an
advantageous arrangement place for fastening elements for fastening
attachments of the axial piston engine, for example for the direct
or indirect fastening of connection fittings for hydraulic lines.
One advantage of such an arrangement place is for example that the
apex of the elevation is elevated in relation to the downward
sloping side wall portions on either side and for this reason there
is a spatially advantageous and/or large free space for assembling
and/or disassembling the respective attachment.
[0011] For an attachment in the form of a line connection part the
advantage arises that the radially widened interior portion is
fluidically advantageous because there is a larger free interior in
the region of the flow opening.
[0012] In the axial piston engine according to the invention in
accordance with claim 6, on the periphery of the transverse wall of
the housing a radial elevation of an angular or U-shaped cross
section is disposed, in the apex region of which a hydraulic
connection point with a connection opening is disposed. Like the
previously described developments of the invention, this
alternative according to the invention also leads to a hydraulic
connection point, which is elevated and hence spaced transversely
apart from the surrounding region of the housing and which because
of the clearance surrounding it guarantees not only a spatially
more advantageous arrangement but also handling-friendly assembly
and/or disassembly of the associated hydraulic line. This
development according to the invention also makes it possible for
the hydraulic line not only to be disposed radially but also to be
of an angular design or bent into an angular shape, for example at
an acute angle of for example ca. 45.degree..
[0013] Within the scope of the invention, a plurality of elevations
may be disposed diagonally opposite one another and/or on one side
of the housing and/or offset in the peripheral direction, thereby
resulting in a polygonal or semicircular or substantially square
cross-sectional shape for the housing as well as the existence of a
corresponding number of radially widened interior portions.
[0014] If in each case two, three or four elevations according to
the invention are disposed offset in the peripheral direction, an
adjusting device for adjusting and setting the throughput volume of
the axial piston engine and a device for limiting the maximum
setting, for example for limiting the swivel of a swash plate, may
be realized in a spatially advantageous manner.
[0015] Advantageous developments of the invention lead to further
improvements of the spatially advantageous design of the housing
and/or attachments attachable thereto and to improvements in the
fastening of the axial piston engine to a carrier, wherein the
assembly and/or disassembly of the components of the axial piston
engine that are situated in the housing interior is also
improved.
[0016] There now follows a detailed description of advantageous
developments of the invention with reference to a preferred
embodiment and the drawings. The drawings show:
[0017] FIG. 1 a diagrammatically represented axial section of an
axial piston engine according to the invention;
[0018] FIG. 2 a perspective single-part representation of a swash
plate of the axial piston engine in its minimum throughput volume
position;
[0019] FIG. 3 a perspective front view of an axial piston engine
according to the invention and
[0020] FIG. 4 a front view of a rear pot-type housing of the axial
piston engine according to FIG. 1 or 3.
[0021] The axial piston engine of an exemplary construction that is
represented in FIG. 1 and denoted as a whole by 1 comprises a
housing 2, in the interior 3 of which a swash plate 4 and a
cylinder drum 5 are disposed axially adjacent to one another.
Disposed in the cylinder drum 5 of a circular cross-sectional shape
and distributed along a periphery are piston holes 6, which extend
for example parallel to the centre line 7 of the cylinder block 5
and the axial piston engine 1 and open out at the side facing the
swash plate 4. In the piston holes 6 pistons 9, which are
preferably cylindrical in cross section, are mounted in a
longitudinally displaceable manner and with their piston heads
delimit working chambers 11 in the piston holes 6 in the direction
of the swash plate 4. The bottom ends of the pistons 9 facing the
swash plate 4 are supported in each case by means of a joint 12 on
the opposing oblique face 4a of the swash plate 4, wherein sliding
blocks 13 may be provided, between which and the bottom ends are
disposed the joints 12, which preferably take the form of ball
joints having a ball head and a ball socket.
[0022] The end of the cylinder drum 5 remote from the swash plate 4
rests against a cam disc 14, on which at least two control openings
15a and 15b are disposed diametrically opposite one another and
form longitudinal portions of an indicated supply line 16 and a
discharge line 17, which extend through an adjacent housing
transverse wall 18a, against which the cam disc 14 is held. The
cylinder drum 5 is disposed on a driving shaft 19, which is mounted
rotatably in the housing 2 and the axis of rotation 21 of which
extends coaxially with the centre line 7 of the cylinder drum
5.
[0023] In the present embodiment, the housing 2 is formed by a
pot-shaped housing part 2a having a housing base 2b and a
peripheral wall 2c as well as by a lid-shaped flange 2d, which lies
against the free edge of the peripheral wall 2c, is connected
thereto by a screw connection 22 using screws 22a, traces of which
are represented, and forms a front transverse wall 18b of the
housing.
[0024] The driving shaft 19, which penetrates the cylinder drum 5
in a rotatably fixed manner in a bearing hole 5a, is rotatably
mounted by means of suitable bearings 25, 25a on the housing base
2b and the front transverse wall 18b and/or on the flange 2d,
wherein the driving shaft 19 axially penetrates the transverse wall
18d and/or the flange 2d in a through-hole 23, is sealed therein by
means of a ring seal 24 and with a driving pin 19a projects axially
from the housing 2. The pot-shaped housing part 2a and the flange
2d are in mutual abutment with flat seating faces 2f, thereby
forming a parting joint 26 between these components that is sealed
in a non-illustrated manner, for example by means of a ring seal.
For coaxially positioning the flange 2d and the pot-shaped housing
2a on one another a centring device 27 is preferably provided, for
example in the form of a projection that protrudes from the
associated seating face 2f and fits into a matching recess in the
opposite seating face 2f or into the inner edge of the interior
3.
[0025] Disposed, for example coaxially, in the swash plate 4 is a
through-hole 28, which is penetrated by the driving shaft 19 with
radial motional clearance. The swash plate 4 is supported axially
in a forward direction, i.e. in the direction of the driving pin
19a, and radially against the inside of the flange 2d, preferably
in a positive manner.
[0026] The axial piston engine 1 may be an axial piston engine with
a fixed or variable throughput volume. In the latter case, it has
an adjusting device 31, which is indicated in FIG. 1 by a double
arrow and by means of which the throughput volume may be either
decreased or increased, wherein different known designs may be
used.
[0027] In the present embodiment, by means of an adjusting
mechanism 31a the swash plate 4 is adjustable in a swivel joint 32
in one or the other swivelling direction about a swivelling axis
32a oriented transversely of the axis of rotation 21 and/or
longitudinal centre line and is lockable in the respective adjusted
position.
[0028] The swivel joint 32 may be formed by a so-called swivelling
cradle, comprising either one transversely continuous or two
arc-segment-shaped concave joint faces 32b disposed on both sides
of the driving shaft 19 on the inside of the flange 2d and either
one transversely continuous or two arc-segment-shaped convex joint
faces 32c disposed on both sides of the through-hole 28 on the
swash plate 4. In the embodiment, the swivel joint 32 is a slide
bearing. It may however be formed also by a rolling-contact bearing
or needle bearing, which may be realized in a small-scale design by
rolling bodies disposed between the joint faces 32b, 32c.
[0029] The peripheral wall 2c of the housing 2 has a radial
elevation 34a, which is angular or U-shaped and/or roof-shaped in
cross section and the apex 34d of which extends in the longitudinal
direction of the tubular peripheral wall 2c. The elevation 34a is
formed by two peripheral wall portions 2e disposed in an angular
and/or U-shaped manner, which are elevated tangentially or like a
secant in relation to an imaginary hollow-cylindrical peripheral
wall and are connected to one another in the apex 34d of the
elevation 34a. In the embodiment, the elevation 34a extends over
the axial length L1 of the peripheral wall 2c or also as elevation
34b over the thickness L2 of the rear transverse wall 18a of the
pot-type housing 2a, wherein the flange 2d may preferably also have
a corresponding elevation 34c, which in the axial projection may be
approximately congruent with the elevation 34a and may extend over
the thickness L3 of the front transverse wall 18b. It is therefore
possible to define an elevation 34 that extends over the entire
length L of the housing 2 and is composed axially of the in each
case integrally formed elevations 34a, 34b, 34c, wherein the
elevations 34a, 34b are also axially integrally connected to one
another.
[0030] As the elevation 34b at the periphery of the rear transverse
wall 18a and/or of the housing base 2b does not delimit the
interior 3 of the housing 2, in this development there is no
interior widening either. In this development according to the
invention, the elevation 34b is delimited by lateral surface
portions 34e, which are disposed in an angular or U-shaped manner
and between them include the elevation 34b. This applies also to
the elevation 34c at the periphery of the flange 2d.
[0031] The elevation 34a with its peripheral wall portions 2e of
for example substantially equal thickness d delimits a radially
widened interior portion 36, which is suitable for the protected
arrangement of selective, yet to be described detail designs or
components of the axial piston engine 1 in a spatially advantageous
manner.
[0032] The peripheral wall 2c may comprise two elevations 34a
disposed diagonally opposite one another or a plurality of
elevations 34a, for example three or four, disposed offset in the
peripheral direction, for example by approximately 90.degree..
Given the existence of four elevations 34a arranged distributed
along the periphery, the peripheral wall 2c may have a
substantially square or rectangular cross-sectional shape, wherein
the corners may be rounded in the sense of rounded corners and the
side walls 2g extending therebetween--viewed in cross section--may
be curved slightly in an outward direction, as shown in FIGS. 3 and
4. In this case, the side walls 2g may be formed in each case by
the two mutually remote peripheral wall portions 2e of both
elevations 34a that are adjacent to one another in peripheral
direction.
[0033] Preferably, the peripheral wall portions 34e of the housing
base 2b and the flange 2d that extend between the elevations 34b,
34c are also adapted to the shape and size of the side wall
portions 2g of the peripheral wall 2c.
[0034] It is possible for example for an adjusting mechanism 31a
forming part of the adjusting device 31 to be disposed in an
interior portion 36, and namely be offset in a spatially
advantageous manner outwards or alternatively along the swivelling
axis 33 and hence obliquely and/or diagonally in relation to the
cylinder drum 5.
[0035] In order to improve the mechanical connection of the
adjusting mechanism 31a to the swash plate 4, the swash plate 4
also has at least one radial elevation 37 that lies axially
opposite the associated interior portion 36, so that the adjusting
mechanism 31a, which is indicated in FIG. 2 as an arrow pointing
towards the elevation 37 or as a double arrow, may act in the sense
of an exertion of pressure and/or tension on the elevation 37.
[0036] Preferably, on the swash plate 4 too there is an elevation
37 disposed axially opposite each interior portion 36, wherein
given the existence of four elevations 37 the swash plate 4 may
have a square or rectangular shape and the corners of the swash
plate 4 may also be rounded.
[0037] The adjusting device 31 may comprise two adjusting
mechanisms 31a1, 31a2, which act axially in opposite directions and
which may be disposed with a radial spacing on both sides of the
swivelling axis 33 and in this case may be disposed in relation to
the swivelling axis 33 diagonally or obliquely opposite one
another. This last detail may be seen in FIG. 2. Such adjusting
mechanisms 31a1, 31a2 acting in opposite directions to one another
may be formed for example by means of a hydraulic swing-out piston
and a hydraulic swing-back piston, which may act axially in
opposite directions or in the same direction upon the swash plate
4, wherein in the latter case one of the two pistons actuates the
other piston.
[0038] In at least one radially widened interior portion 36 a
swivel-limiting device 41 in each case for limiting the maximum
and/or minimum swivel angle of the swash plate 4 may also be
disposed in a spatially advantageous manner. FIGS. 2 and 4 show two
swivel-limiting devices 41, of which one is provided for the
maximum and the other for the minimum swivel angle position. The at
least one swivel-limiting device 41 may be formed for example by
means of a stop screw 41a, which is screwed into a thread of a
non-illustrated inner projection of the peripheral wall 2c and with
a spacing oriented transversely or obliquely in relation to the
swivelling axis 33 may be screwed selectively to and fro relative
to the swash plate 4 and/or the associated elevation 37, for
example by means of a screwdriver applied to the head of the stop
screw.
[0039] In order to improve the access to the at least one
adjustable swivel-limiting device 41 or stop screw 41a, it and/or a
hole or threaded hole receiving it may extend in the peripheral
wall 2c preferably obliquely outwards so that the swivel-limiting
device 41 and/or the screw head is accessible from outside. This is
represented by way of example in FIG. 3, in which the
swivel-limiting device 41 disposed top right comprises a stop screw
41a, which extends outwards in an obliquely upward and backward
direction in a correspondingly obliquely disposed hole or threaded
hole and is therefore accessible from outside. In a corresponding
manner the other swivel-limiting device 41 and/or stop screw 41a
may also be disposed so as to be accessible from outside. Thus, the
at least one elevation 34a, 34b, 34c and the at least one adjusting
mechanism 31a and/or swivel-limiting device 41 may be
disposed--viewed axially--between the longitudinal plane E1
containing the swivelling axis 33 and a longitudinal centre plane
E2 situated at right angles thereto.
[0040] The one or two swivel-limiting devices 41 may therefore also
be disposed on both sides of the swivelling axis 33 diagonally or
obliquely opposite one another in relation thereto. In this case,
the other swivel-limiting device 41 that is not represented in FIG.
1 may be designed so as to be accessible from outside, in the
manner described for the swivel-limiting device 41 disposed top
right, and may be disposed for example in an, in relation to the
longitudinal plane E1 and/or the longitudinal plane E2,
mirror-image position.
[0041] The at least one elevation 34a, 34b is suitable also in a
spatially advantageous manner for the arrangement of hydraulic
functional elements, such as for example at least one connection
point 38 with a connection opening for supplying and discharging or
scavenging the hydraulic medium, in particular hydraulic oil. There
are also provided in the region of the connection opening 38a1,
38a2 fastening elements 39a, which are part of a fastening device
39 for fastening connection fittings or connection lines, for
example the supply- and/or discharge line 16, 17, or a leakage
line.
[0042] In the embodiments, one or two connection openings 38a1,
38a2 is/are disposed in the apex 34d of the elevation 34a and/or
34b, namely in the longitudinal region L2, in which the rear
transverse wall 18a and/or the housing base 2b is situated, and/or
in the longitudinal region L1 of the peripheral wall 2c. The
connection opening 38a1 and/or 38a2 is formed by means of a hole
that transversely penetrates the peripheral wall 2c or the housing
base 2b in the apex 34d, wherein the centre line 38b of the
connection opening 38a1, 38a2 and/or of the hole is situated in the
bisector of the peripheral wall portions 2e and/or lateral surface
portions 34e and/or includes therewith a, for example, obtuse angle
W1 of ca. 135.degree. or, given the existence of a ca. 45.degree.
fitting, an acute angle W2 of ca. 45.degree..
[0043] Within the scope of the invention the hole forming the
connection opening 38a1 may, according to the left of FIG. 3, serve
directly as a fastening element for an associated hydraulic line,
for example in the sense of a threaded connection, so that the hole
itself is a fastening element 39a of the fastening device 39.
[0044] The embodiment shows in FIG. 3 on the right as fastening
elements 39a an attachment face 39b, which extends approximately at
right angles to the centre line 38b and surrounds the connection
opening 38a2, and two or more fastening holes 39c, which are
disposed opposite one another, preferably in the attachment face
39b, and used for the screw connection of a connection fitting for
a hydraulic line that may be placed on the attachment face 39b and
screw-fastened by non-illustrated screws to the peripheral wall
2c.
[0045] The attachment face 39b and/or the connection opening 38a1
is situated preferably on and/or in a second elevation 42, which is
elevated in the sense of a projection from the first elevation 34a,
34b.
[0046] A second connection opening 38a1 or 38a2 may be disposed in
the region of one of the other elevations 34a, 34b that are offset
in the peripheral direction, for example in the diametrically
opposite elevation 34a, 34b, as is shown in FIG. 4. In this case,
there may be associated with this connection opening 38a1, 38a2
identical or different fastening elements 39a of a fastening device
39 for fastening an associated hydraulic line, for example of the
existing circuit.
[0047] As is evident in particular from FIG. 4, the connection
fitting 38c disposed at the top right of the connection point 38
may comprise a connection element 38d for an associated line, the
centre line 38e of which line extends parallel to the seating face
39b and/or parallel to the seating face of the connection fitting
38c that rests thereon and with the centre line 38b includes an
approximately right angle. Given such an arrangement, the centre
line 38e of the connection fitting 38c with the adjacent side wall
portion 2g includes the acute angle W2 of ca. 45.degree..
[0048] Within the scope of the invention it is however also
possible for the connection fitting 38c to be integrally connected
to the elevation 34a, 34b.
[0049] Thus, independently of the previously described development
of the connection points 38 for the hydraulic circuit, it is
likewise advantageous to dispose a connection point 38 for a
leakage line only in the at least one elevation 34a, wherein this
connection point is disposed in the longitudinal region L1 of the
interior 3.
[0050] The peripheral wall portions 2e of the peripheral wall 2c
lead also to a widening and improvement of a seating on the side
wall portions that form them, namely particularly if at least one
relevant elevation 34a and/or 34b is of a, not rounded, but angular
design, as is shown at the top of FIG. 3 and at the top left of
FIG. 4. Such a peripheral wall portion 2e, particularly if its
outer surface is flat, is suitable as an attachment face 45 for a
trigger device 46 for triggering the adjusting mechanism 31a
disposed in the associated interior portion 36. The trigger device
46 has connections for an electric power supply and/or hydraulic
supply.
[0051] The flange 2d is detachably connected to the pot-type
housing 2a by a screw connection 51 using a plurality of screws
51a, which are arranged distributed along the periphery, penetrate
through-holes in the flange 2d and are screwed into threaded holes
in the edge region of the peripheral wall 2c.
[0052] For fastening the axial piston engine 1 to a non-illustrated
carrier, for example an engine frame, a second indicated screw
connection 52 is provided, which comprises a plurality of screw
holes 52a in the flange 2d, which are arranged distributed along
the periphery, for example in the elevations 34c, for
non-illustrated screws that may be introduced into the screw holes
52a and screwed into non-illustrated threaded holes of the carrier.
The screw holes 52a may be formed by slots that are open at the
periphery.
[0053] The flange 2d may serve also as an adapter for the adapted
fastening of the axial piston engine 1 to different carriers (for
example of different manufacturers). For such a case two flanges 2d
are provided, the screw holes 51a of which are of an identical
design for an identical hole pattern of an identical screw
connection 51, while the two flanges 2d have screw holes 52a of
different hole patterns, which are adapted in each case to the
associated hole pattern of the respective carrier.
[0054] The invention is not restricted to the described embodiment
and is suitable for example also for inclined-axis-type axial
piston engines. All of the features of the description and/or the
drawings may, within the scope of the invention, be combined in any
desired manner with one another.
* * * * *