JPS6270672A - Hydraulic mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hydraulic mechanism having a fluid distribution surface and an opposite surface.

Pressurized fluid motors, particularly hydraulic motors, known in the prior art include a surface that distributes fluid into successive cylinders and sometimes an opposite distribution surface. The dispensing opposite surface is provided as a wear part that allows the mechanism to maintain its initial operating characteristics even after long periods of operation.

SUMMARY OF THE INVENTION The present invention relates to such a mechanism, that is, a hydraulic mechanism such as a motor or a pump, which includes a cylinder block having a communication surface that communicates with the outside, a plurality of cylinders formed in the cylinder block, and a cam. and a distribution surface fixedly rotated with the cam and having a communicating surface, and a piston sliding within each cylinder, each cylinder being connected to the communicating surface of the cylinder block by at least one cylinder conduit. connected, further, the cylinder conduit opens to the communication surface through the cylinder orifice, and the cylinder block is mounted to the cam for rotation about an axis of rotation;
The piston abuts on the surface of the cam, while the cam has a plurality of ramps following each other in pairs, and the distribution surface has a ramp consisting of a first orifice and a second orifice opening into the communicating surface. and a first orifice of the pair of orifices communicates with a first chamber containing pressurized fluid, and a second orifice of the pair of orifices is not pressurized. The plurality of pairs of orifices are in communication with the second chamber, and the plurality of pairs of orifices follow each other on the communication surface of the distribution surface, and the second orifice of the pair of orifices is connected to the first orifice of the pair of orifices and the next pair of orifices. the first orifice of
Further, during rotation of the cylinder block with respect to the cam and the distribution surface, each cylinder orifice continuously communicates with the first orifice of the pair of orifices, and then the first orifice of the pair of orifices. located at [111 of the first orifice and the second orifice and isolated from the first orifice and the second orifice, and finally the first orifice
It communicates with the second orifice of the pair of orifices, and the communication surfaces of the cylinder block and the distribution surface are flat, perpendicular to the axis of rotation, and in direct contact with each other, while the cylinder orifice and the first orifice and the second orifice of the distribution surface are all 2v centered on the axis of rotation.
This invention relates to a hydraulic mechanism configured to open between concentric circles of A.

In the present invention, it is desirable to provide the mechanism with an IgI or higher dispensing surface that is not an essential component.

However, even with the provision of one or more distributing surfaces, the purpose of the present invention is in no way to seek a solution to the problem of maintaining initial operating characteristics. The object of the invention is to
It is an object of the present invention to provide a mechanism in which the transverse dimension in a plane perpendicular to the rotational axis of a rotor is made as small as possible. Engineers attempting to design such mechanisms are hampered by the need to ensure that the orifices of any cylinder do not overlap two consecutive orifices of the fluid distribution surface. If they overlap, the pressurized fluid contained in one of these two orifices in the fluid distribution surface will return to the unpressurized chamber without actuation within the corresponding cylinder. In order to transfer a given flow rate, the cross-section of each orifice must be made larger than a minimum value. Conventionally, the minimum distance between the adjacent edges of two consecutive orifices of the distribution surface had to be greater than the corresponding dimension of the orifice of a cylinder that could be placed between said two orifices of the distribution surface.

In the present invention, by adopting a special configuration,
Since the value of this minimum distance can be reduced, a smaller mechanism can be manufactured than the conventional machine +13.

To this end, in the invention, the shape of the cylinder orifice is complementary to the shape of the first and second orifices of the distribution surface, and the shape of the distribution surface of the cylinder orifice is the first of a pair of orifices
The area of the cylinder orifice is sufficient to provide an operating gap that allows communication with the orifices, isolation of the pair of orifices from the first and second orifices, and communication with the second orifice of the pair of orifices. The area of the center space is approximately equal to the area of the space surrounded by the first orifice and the second orifice.

A mechanism such as a motor or a pump according to another embodiment of the present invention includes a cylinder block having a communication surface that communicates with the outside;
a plurality of cylinders formed within the cylinder block;
a cam, a distribution surface fixedly rotated with the cam and having a communicating surface, and at least one first opposite distribution surface disposed between the cylinder block and the distribution surface; The pistons slide and each cylinder is connected to a communicating surface of the cylinder block by at least one cylinder conduit, the cylinder conduits opening into the communicating surface through a cylinder orifice, and the cylinder block is connected to an axis of rotation. The piston is mounted on the cam for rotation about its center, and the cam has a plurality of ramps following each other in pairs, while the piston rests on the surface of the cam, and the cam has a plurality of ramps following each other in pairs; has a number of pairs of orifices equal to the number of pairs of ramps each consisting of a first orifice and a second orifice opening into the communication surface, the first orifice of the pair of orifices communicating with a first chamber containing pressurized fluid; Further, the second orifice of the pair of orifices is in communication with the unpressurized second chamber, and the plurality of pairs of orifices follow each other on the communication surface of the distribution surface, and the second orifice of the pair of orifices The two orifices are disposed between the first orifice of the pair of orifices and the first orifice of the next pair of orifices, and further, during rotation of the cylinder block relative to the cam and distribution surface, each cylinder orifice , successively, the first of the pair of orifices
After communicating with the orifices, it is located between the first orifice and the second orifice of the pair of orifices and is isolated from the first orifice and the second orifice, and finally the pair of orifices. The first distributing opposite surface communicates with the second orifice of the orifice and rotates fixedly with the distributing surface and one of the cylinder block, and includes two communicating surfaces, one of the two communicating surfaces being connected to the first distributing surface. The opposite side of the distribution surface is fixed, facing the communication surface of one of the two legs of the distribution surface and the cylinder block,
Furthermore, the other of the two communication surfaces is flat and perpendicular to the axis of rotation, and abuts a plane that is fixed relative to the distribution surface and the other of the cylinder block; While perpendicular to the center, the transfer orifices open in these two planes, each of the transfer orifices corresponding to a cylinder orifice being in permanent communication with the cylinder orifice; , of the transfer orifices, first and second transfer orifices corresponding to the first and second orifices of the dispensing surface are in permanent communication with the first and second orifices, respectively;
Further, all of the above transfer orifices are configured to open between two concentric circles centered on the rotation axis.

In this arrangement according to the invention, the shapes of the cylinder orifice and the transfer orifice are complementary to the shapes of the first and second transfer orifices and the shapes of the first and second orifices, respectively, and are continuous. communicating with the first orifice of the pair of orifices of the distribution surface of the bipedal cylinder orifices, isolating the pair of orifices from the first and second orifices, and The area of the cylinder orifice is approximately equal to the area of the space enclosed between the concentric circles and between the first orifice and the second orifice so as to provide a working gap that allows communication with the second orifice.

The biggest advantage obtained by adopting the configuration according to the present invention is that the cylinder orifice circle can be arranged on a circle with a smaller radius than the corresponding circle of the conventional mechanism, so that it is smaller, lighter, and lighter. It is possible to manufacture a cheaper mechanism.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be explained below with reference to the attached drawings for each embodiment.

The present invention is disclosed in French Patent Nos. 2504987 and 25
It is particularly applicable to surface pressure mechanisms such as those disclosed in No. 33965. Each of the embodiments of the present invention shown in FIGS. 1 to 21 relates to a hydraulic motor, which has two parts: a casing (i) consisting of two parts; and a casing (i) having two parts. an intermediate ring 2 which is mounted on two parts of the casing 1 by screws 3 and supports a corrugated cam 4;
Each corrugation is formed by means of an intermediate ring 2 having two ramps, one corresponding to the inflow of fluid into the hydraulic motor and the other corresponding to the discharge of fluid from the hydraulic motor, and a tapered roller bearing 6, which Casing l around core 7
an output shaft 5 of a hydraulic motor, which is mounted so as to rotate with respect to the spline 8 and has a spline 8 formed thereon; a cylinder block 9 mounted to rotate about the axis 7 relative to the casing ■; a cylinder II formed within the cylinder block 9 and disposed radially with respect to the axis 7;
Each cylinder! a piston 12 mounted so as to slide within the piston I2; and a roller 13 housed in a housing 14 provided within the piston I2, each of which is provided in each piston 12 and connected to a pin parallel to the axis 7. a roller 13 which rotates around the cam 4 and is in rolling contact with the cam 4; a roller 13 formed in the cylinder block 9 and perpendicular to the axis 7; A plane 18 perpendicular to the center 7 and two grooves 19 and 20 symmetrical in the direction of the axis 7 are formed in the distribution surface 17 so as to connect the grooves 19 and 20 to the plane 18, respectively, so that the orifice 23 and 2 opening into plane 18 via 24
conduits 21 and 22, means 25 for maintaining the distribution surface 17 in fixed rotation with the casing 1, and one of the orifices 23 and 24
Furthermore, one of the orifices 23 and 24 (23) corresponds to one ramp of the waveform of the cam 4, and the other of the orifices 23 and 24 (24) corresponds to one ramp of the waveform of the cam 4. a distribution surface 17 adapted to correspond to the other ramp of the corrugation of the cam 4; and conduits 26 and 27 formed in the casing 1 and for supplying and discharging pressurized fluid. connection 2 connected to outer conduits 28 and 29 for
8 and 29 are formed in the cylinder block 9 with conduits 26 and 27 connecting the grooves 19 and 20, respectively, and each connecting the cylinder 11 to the plane 16 of the cylinder block 9 through an orifice 33. and a plurality of conduits 32 opening into the plane I6.

In the first embodiment of the invention according to FIGS. 1 to 4, the plane 18 of the distribution surface I7 abuts the plane 16 of the cylinder block 9. In the first embodiment of the invention according to FIGS. All the orifices 33 in the plane 16 are circular and identical and are located on the circumference centered on the axis 7, so there are two concentric circles 34 (outer circle) and 35 (inner circle).
be in contact with Furthermore, the orifices 33 are arranged at equal angular intervals.

The orifices 23 and 24 in the plane 18 of the distribution surface 17 are also equally angularly spaced and have respective radii concentric circles 34.
It is formed into an arc shape that touches two concentric circles 34a (outer circle) and 358 (inner circle) centered on the axis 7, which has a radius equal to the radius of and 35. Each orifice 23 is spaced apart from the next orifice 24, leaving a slightly wider surface between two adjacent orifices 23 and 24 than the surface corresponding to orifice 33 in plane 16. Therefore, during rotation of the cylinder block 9 relative to the distributor valve 17, the plane 1 of the cylinder block 9
Each orifice 33 of 6 is successively initially connected to the distribution surface 1
fully communicating only with the orifice 23 of the plane 18 of 7 and then located between the orifice 23 and the next orifice 24 and isolated from both of these orifices 23 and 24;
Finally, in complete communication only with the orifice 24,
Repeat the same operation below.

As shown in the figure, the orifice 33 is circular;
When the orifices 23 and 24 are formed in an arc shape, the shapes of one orifice 23 and 24 and the other orifice 33 are complementary, and the orifice 33 located between the orifices 23 and 24 is separated from the orifices 23 and 24. At the same time, the hydraulic switching of the orifice 33 and the orifice 23 is separated, the orifice 33 is isolated from the two orifices 23 and 24, and finally the orifice 33 and the orifice 24 are communicated. Concentric circles 34 and 35 (or 34a
35a) and the two orifices 23 and 24 is obtained by the invention.

5, 6 and 7 show a second embodiment of the invention. In the second embodiment, the plane 18 of the distribution surface 17 is in direct contact with the plane 16 of the cylinder block 9, as in the first embodiment, and the orifices 23 and 24 of the plane 18 are circular, while as described above Orifice 33 has an arcuate shape complementary to the circular shapes of orifices 23 and 24.

The circularity of the hole is often related to the way this hole is formed by drilling. Holes in rigid pieces are often formed by casting, although the shape of the holes as arcs is less common.

In a third embodiment of the invention described below, the rigid parts (distribution surface 17 and cylinder block 9) can be provided with circular holes, so that the holes can be obtained by simply drilling the forged workpiece. , the drilling is performed by one or more complementary parts arranged between the planes 16 and 18 and having an arcuate hole. In a third embodiment of the invention, shown in FIGS. 8-11, a complementary dispensing counter surface 36 is provided for fixed rotation with the dispensing surface 17. The dispensing surface 17 and the opposite distributing surface 36 are manufactured by French Patent No. 25339.
It is fixedly rotated with the casing 1 by connecting means 25 similar to those disclosed in No. 65. The plane 1G of the cylinder block 9 and the plane 18 of the distribution surface 17 are perpendicular to the axis 7 and flat. The counter-distributing surface 36 is also a part of small thickness (for example 3 mm) formed by two planes 37 and 38 perpendicular to the axis 7. The flat surface 37 is in contact with the flat surface 16 of the cylinder block 79 and is slidable relative to the flat surface 16. On the other hand, the plane 38 abuts the plane 18 of the distribution surface 17 .

The opposite distribution surface 36 is provided with three through holes 40 of arcuate uniform cross section. Through holes 39 and 40 correspond to orifices 23 and 24 in distribution surface 17 and do not completely overlap orifices 23 and 24 as shown in FIG.
is layered on top.

Furthermore, the shape of these through holes 39 and 40 is complementary to the shape of the orifice 33 in the plane 16 of the cylinder block 9, where the term "complementary" has already been explained with respect to FIGS. 3 and 4. has the same meaning as Through holes 39 and 4
0 is sandwiched between concentric circles 34b and 35b centered on axis 7 having the same radius as concentric circles 34 and 35, respectively.

In a fourth embodiment of the invention shown in FIGS. 12 to 15, the opposite distribution surface 43 is fixedly rotated with the cylinder block 9 by means of a screw 41, while the distribution surface 17 is fixedly rotated with the casing l by means of a connecting means 25. be done. The opposite distribution surface 43 has two planes 44 perpendicular to the axis 7.
and 45 with a small thickness (about 3 mm)
The planes 44 and 45 are cylinder pro, respectively.
The plane 16 of the hook 9 and the plane 18 of the distribution surface 17 abut.

The opposite distribution surface 43 is the orifice 3 of the cylinder block 9.
The number of through holes 42 is equal to 3. The through hole 42 corresponds to the orifice 33 and is superimposed on the orifice 33 without completely overlapping with the orifice 33, as shown in FIG. The through holes 42 have concentric circles 34 and 3, respectively.
It is determined between concentric circles 34c and 35c having the same radius as 5. Furthermore, the through hole 42 has an arcuate shape that is complementary to the orifices 23 and 24 of the distribution surface 17, as shown in FIG.

The fifth embodiment of the present invention shown in FIGS. 16 to 21 is similar to the third embodiment shown in FIGS. 8 to 11, and the fourth embodiment shown in FIGS. 12 to 15.
This is a modification of the embodiment, and includes two opposing distributing surfaces 36 similar to those shown in FIG. Includes a dispensing opposite surface. These distribution opposing surfaces 36 and 43 have the features described above. The only difference is the abutment of the plane 37 of the dispensing counter surface 36 against the plane 45 of the dispensing counter surface 43. As shown in FIG. 19, the through holes 39 and 40 on the opposite distribution surface 36 and the through hole 42 on the opposite distribution surface 43 are further formed into complementary trapezoidal arc shapes. Therefore, it should be noted that the embodiments of FIGS. 16 to 21 provide the following configurations (1) to (4).

(1) The flat surface 44 of the opposite distribution surface 43, which is fixed and rotated together with the cylinder block 9 by the screw 41, comes into contact with the flat surface 16 of the cylinder block 9, and the through hole 42 of the opposite distribution surface 43 connects the circular orifice 33 of the cylinder block 9. It is superimposed on the orifice 33 without completely covering it (FIG. 17).

(2) The flat surface 38 of the dispensing counter surface 36, which is fixedly rotated together with the dispensing surface 17, is in contact with the flat surface 18 of the dispensing surface 17, and the through holes 39 and 40 of the dispensing counter surface 36 are connected to the circular orifice 23 of the dispensing surface 17. and 24 without completely covering them (FIG. 20).

(3) The flat surface 37 of the opposite distribution surface 36 is in contact with the flat surface 45 of the opposite distribution surface 43.

(4) The trapezoidal shape of the through hole 42 on the opposite distribution surface 43 is complementary to the through holes 39 and 40 on the opposite distribution surface 36 (FIG. 19)
.

In the various embodiments described above, the through holes on the opposite distribution surfaces 36 and 43 have a special shape, for example, an arc shape with a 211-cut concave surface or a roughly trapezoidal shape, and when processed by a laser device, a punching machine, etc. 6 In the embodiment described above, the distributing surfaces 36 and 43 are parts of small thickness so that they can be easily and inexpensively formed.
The plane 16 of the cylinder block 9, the planes 37 and 38 of the opposite distribution surface 36, the planes 44 and 45 of the opposite distribution surface 43, and the plane 18 of the distribution surface 17 are flat and perpendicular to the axis 7. This feature is necessary to allow the surfaces to slide against each other as they rotate, and this sliding is
For example, the embodiments of FIGS. 1 to 4 and the embodiments of FIGS.
Planes 16 and 18 in the embodiment shown, planes 16 and 37 in the embodiment of FIGS. 8 to 11, planes 45 and 18 in the embodiment of FIGS. This occurs between planes 37 and 45 in the example.

As mentioned above, it is easy to manufacture the opposite side of the distribution from a thin sheet metal of about 2 to 5 mm. Thereby, when a sheet metal with a parallel structure effectively produces a distributing counter surface, surfaces other than those which must be flat and perpendicular to the axis 7 may also be used, although there is no functional necessity. It is flat and perpendicular to the axis 7.

However, it goes without saying that the surfaces other than those that must be flat and perpendicular to the axis 7 may be formed in any shape other than flat, for example, complementary shapes that abut each other.

The following parts are fixed to each other, i.e., the distributing opposite surfaces 3 in the embodiments of FIGS. 8 to 1t and FIGS.
6, the plane 18 of the distribution surface 17, the plane 44 of the opposite distribution surface 43 in the embodiments of FIGS. 12 to 15 and 16 to 21, and the plane 16 of the cylinder block 9.
may be formed in any shape, such as complementary shapes that abut in a sealed manner.

Effect of the invention The advantages of the embodiment of the present invention described above are as follows.

Firstly, the orifices 33 and distribution surface 17 of the cylinder block 9 of the embodiment of FIGS.
The complementary shape of the orifices 23 and 24 allows more arcuate orifices 23 and 24 with narrow centers to be arranged between concentric circles 34 and 35 of a given diameter than circular orifices 23 and 24. It becomes possible. At this time, in order to convey the same flow rate in the two structures, it is assumed that the circular shapes of the orifices 23 and 24 are naturally formed to have the same cross section as the arc shape. Concentric circles 3 in a configuration in which arc-shaped orifices are provided for a predetermined number of pairs of orifices 23 and 24 and for the predetermined number of waveforms of the cam 4.
The diameters of 4 and 35 can also be smaller than when the orifice is circular. In other words, the mechanism according to the invention is smaller than conventional mechanisms, so it is lighter and less expensive.

Second, as mentioned above, the use of thin opposing distributing surfaces 36 and 43 reduces the manufacturing cost of the mechanism of the present invention, since it is easier to form arcuate shapes from thin parts than from rigid parts. It gets lower. When using dispensing opposing surfaces, an advantage is also obtained that a sealing contact between the surfaces can be made more easily with thin, slightly deformable parts than with rigid parts.

[Brief explanation of drawings]

FIG. 1 is an axial sectional view of a hydraulic motor according to a first embodiment of the present invention, FIG. 2 is a partial sectional view taken along line ■-■ in FIG. 1, and FIGS. , respectively, are sectional views taken along lines 1 and 2 in FIG. 1, and FIG. 5 is an axial sectional view of a hydraulic motor according to a second embodiment of the present invention.
Figures 6 and 7 are lines ■-■ and line ■ in Figure 5, respectively.
8 is an axial sectional view of a hydraulic motor according to a third embodiment of the present invention, and FIG.
10 and 11 are lines IK and X of FIG. 8, respectively.
12 is an axial sectional view of a hydraulic motor according to a fourth embodiment of the present invention, and FIGS. 13, 14, and 15 are respectively sectional views of FIG. It is a sectional view taken along line x■, line XIV, and line
FIG. 6 is an axial sectional view of a hydraulic motor according to a fifth embodiment of the present invention, and FIGS. 17, 18, 19, and 2
Figure 0 corresponds to line XVII, line X■, and line XI in Figure 16, respectively.
21 is a sectional view taken along line X and line XX, and FIG.
FIG. 6 is a detailed view of a portion of FIG. 6; 1...Casing, 2...Intermediate ring, 3.4
1...screw, 4...cam, 5...output shaft,
6... Tapered roller bearing, 9... Cylinder block, It... Cylinder,
12... Piston, 16, + 8.37.38, 44.45... Plane, 1
7... Distribution surface, 2 +, 22, 26, 27, 30. 31. 32... Conduit, 23.24.33 - Orifice, 36.43... Distribution opposite surface, 39.40.42.・Through hole.

Claims (3)

[Claims] (1) In hydraulic mechanisms such as motors and pumps, a cylinder block (9) having a communication surface (16) that communicates with the outside
, a plurality of cylinders (11) formed in the cylinder block (9), a cam (4), and a distribution surface (1) fixedly rotated together with the cam (4) and having a communication surface (18).
7) and a piston (12) sliding within each cylinder (11), each cylinder (11) communicating with the cylinder block (9) by at least one cylinder conduit (32). Further, the cylinder conduit (32) opens into the communication surface (16) through the cylinder orifice (33), and the cylinder block (9) is connected to the communication surface (16) around the rotation axis (7). The piston (12) is mounted for rotation on the cam (4), and the piston (12) abuts on the surface of the cam (4), while the cam (4) has a plurality of ramps following each other in pairs. The distributing surface (17) is provided with as many pairs of orifices (23, 24) as ramp pairs consisting of a first orifice (23) and a second orifice (24) opening into the communication surface (18). and a pair of orifices (
A first orifice (23) of the pair of orifices (23, 24) communicates with a first chamber (30) containing pressurized fluid, and a second orifice (24) of the pair of orifices (23, 24) communicates with a first chamber (30) containing pressurized fluid. The plurality of pairs of orifices (23, 24) follow each other on the communication surface (18) of the distribution surface (17), and the pair of orifices (23, 24) are in communication with a second chamber (31) which is not
, 24) is the first orifice (23) of the pair of orifices (23, 24) and the first orifice (23) of the next pair of orifices (23, 24).
Furthermore, during rotation of the cylinder block (9) relative to the cam (4) and the distribution surface (17), each cylinder orifice (33) is successively connected to a pair of orifices (23, 24). ), the first orifice (23) is located between the first orifice (23) and the second orifice (24) of the pair of orifices (23, 24). and the second orifice (24)
and finally the above pair of orifices (23
, 24), and the communication surface (16) and distribution surface (17) of the cylinder block (9).
The communicating surfaces (18) of the cylinder orifice (33) and the first orifice (23) of the distribution surface (17) are flat and perpendicular to the axis of rotation (7) and in direct contact with each other. ) and the second orifice (24) are all arranged in two concentric circles (34, 35; 3) centered on the rotation axis (7).
4a, 35a), and furthermore, the shape of the cylinder orifice (33) is such that it opens between the distribution surface (1
7) first orifice (23) and second orifice (24)
), and the first orifice (23) of the pair of orifices (23, 24) of the distributing surface (17) of the above-mentioned cylinder orifice (33), which is complementary to the shape of
, isolation of the pair of orifices (23, 24) from the first orifice (23) and the second orifice (24), and isolation of the pair of orifices (23, 24) from the second orifice (24). ), the area of the cylinder orifice (33) is equal to the center circle (3
4, 35) and the area of the space surrounded by the first orifice (23) and the second orifice (24). (2) In a mechanism such as a motor or a pump, a cylinder block (9) having a communication surface (16) that communicates with the outside;
A plurality of cylinders (11) formed in the cylinder block (9), a cam (4), and a distribution surface (17) fixedly rotated together with the cam (4) and having a communication surface (18).
and at least one first distribution opposing surface (36, 43) disposed between the cylinder block (9) and the distribution surface (17).
and a piston (
12) are sliding and each cylinder (11) has at least one
cylinder block (
Further, the cylinder conduit (32) opens to the communication surface (16) through the cylinder orifice (33), and the cylinder block (9) is connected to the communication surface (16) of the rotation axis (7). ), furthermore, the piston (12) rests on the surface of the cam (4), while the cams (4) follow each other in pairs. The distribution surface (17) has a plurality of ramps, and the distribution surface (17) has the same number of pairs of orifices ( 23, 24), and a pair of orifices (23, 24).
, 24) communicates with a first chamber (30) containing pressurized fluid, and the second orifice (24) of the pair of orifices (23, 24) is pressurized. The plurality of pairs of orifices (23, 24) are in communication with the second chamber (31) which is not connected to the second chamber (31).
18) and a pair of orifices (23, 2
The second orifice (24) of 4) is arranged between the first orifice (23) of the pair of orifices (23, 24) and the first orifice (23) of the next pair of orifices (23, 24). In addition, the cam of the cylinder block (9) (
4) and the distribution surface (17), each cylinder orifice (33) successively communicates with the first orifice (23) of the pair of orifices (23, 24) and then with the first orifice (23) of the pair of orifices (23, 24). located between the first orifice (23) and the second orifice (24) of the orifice (23, 24) and isolated from the first orifice (23) and the second orifice (24), and finally The pair of orifices (23,
24), and the first distribution opposite surface (36, 43) fixedly rotates together with the distribution surface (17) and one of the cylinder blocks (9) (17, 9). , comprising two communicating surfaces (37, 38; 44, 45), one of the two communicating surfaces (37, 38; 44, 45) (
38, 44) are opposed to the communication surface (18, 16) of the distribution surface (17) and the above-mentioned one (17, 9) of the cylinder block (9), to which the first distribution opposite surface (36, 43) is fixed. death,
Furthermore, the other (37, 45) of the two communicating surfaces (37, 38; 44, 45) is flat and perpendicular to the rotating wheel center (7), and is connected to the distribution surface (17) and the cylinder block. The plane (1) fixed with respect to the other (9, 17) of (9)
6, 18), furthermore said planes (16, 18) are perpendicular to the axis of rotation (7), while the transfer orifices (39, 40; 42) lie in these two planes (16). ,1
8), and of the transfer orifices (39, 40; 42), each of the transfer orifices (42) corresponding to the cylinder orifice (33) is in permanent communication with the cylinder orifice (33); (39, 40; 42
), the first transfer orifice (23) and the second orifice (24) of the distribution surface (17) correspond to
39) and a second transfer orifice (40) are in permanent communication with the first orifice (23) and second orifice (24), respectively, and are in permanent communication with said transfer orifice (39, 40;
2) are two concentric circles (7) centered on the rotation axis (7).
34, 35), and furthermore, the cylinder orifice (33) and the transfer orifice (
The shape of the first orifice (42) is different from that of the first transfer orifice (39) and the second transfer orifice (40), respectively.
The shape of the cylinder orifice (23) is complementary to that of the second orifice (24), and the cylinder orifice (3) is formed continuously.
a pair of orifices (23, 24) in the distribution surface (17) of
) with the first orifice (23), isolation of the pair of orifices (23, 24) from the first orifice (23) and the second orifice (24), and The area of the cylinder orifice (33) is such that the area between the concentric circles (34, 35) and between the first orifice (23) and the second A mechanism characterized in that the area is approximately equal to the area of the space enclosed between the orifices (24). (3) In the mechanism described in claim 2,
Transfer orifices (39, 40; 42) dispensing opposite side (3
6, 43), characterized in that the opposite distribution surface (36, 43) is constituted by a thin part formed by a notch of uniform cross section from one communication surface to the other communication surface.