JP3100539B2 - Gerotor type hydraulic device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a housing and a rotor that performs an eccentric rotation while drawing a track inside the housing. The present invention relates to a gerotor-type hydraulic device configured to expand and contract a gerotor small chamber formed by the eccentric rotation of a rotor to discharge a fluid flowing into the device at a high pressure. Its primary use is in pumps, but it can also be used as a motor. 2. Description of the Related Art The principle of operation of a gerotor type hydraulic apparatus will now be described with reference to FIGS. [0003] A gerotor-type hydraulic device includes a housing 20.
And a rotor 28. The housing 20 is formed as a unit, and includes a stator 22 (a gerotor group) that radially surrounds the rotor 28, and a wear plate 21 that contacts one of both axially flat end surfaces of the rotor 28. ,
It has a manifold 23 and an end face cover 24 that are in contact with the other of the two end faces in the axial direction of the rotor 28. [0005] The rotor 28 is eccentrically disposed in the rotor cavity of the stator 22 of the housing 20 and is slidable with respect to both the wear plate 21 and the manifold 23. A plurality of gerotor chambers 29 are formed between the stator 22 and the rotor 28 as shown in FIG. The rotor 28 eccentrically rotates while drawing a trajectory by the rotational driving force via the drive shaft 44 and the swinging rod 38, and expands and contracts the gerotor small chamber 29. As a result, pressure is generated in the gerotor chamber 29,
Between the two fluid connections formed in one part of the housing 20, i.e. between the inlet means (inlet) 30 and the outlet means (outlet) 31, a high pressure is generated in the fluid. The flow of the fluid from the housing 20 to the gerotor chamber 29 is transmitted through a communication passage 33 formed in the wear plate 21.
2 (FIG. 2), an annular groove formed on the opposite side of the wear plate 21, that is, an annular fluid passage 34 (FIG. 3) and the rotor 2
8, an annular fluid passage 37
(FIG. 4) is performed by communicating. Here, since the rotor 28 is eccentrically rotating, the annular fluid passage 37 and the annular fluid passage 34 communicate with each other in a part of the circumferential direction, and communication of the fluid into the gerotor small chamber 29 is ensured. . [0007] The gerotor type hydraulic apparatus as described above has the following problems. First, there is a problem that the communication area between the fluid passage of the housing and the fluid passage of the rotor is small.
That is, since the rotor performs eccentric rotational movement, communication between the housing fluid passage and the rotor fluid passage occurs only in a range where both fluid passages overlap in the axial direction, and as a result, a sufficient steady flow rate is secured. Can not do it. The second problem is that fluid flows through the gerotor-type hydraulic device, causing the temperature of the device to rise. In particular, in the conventional type in which the fluid flows back and forth in the rotor, the amount of heat of the fluid is easily transmitted to the device, and as a result, the temperature of the device, particularly the rotor, is raised. There is also a problem that the device, particularly the rotor, expands due to the heat quantity of the fluid. An object of the present invention is to solve the above-mentioned problems.
A gerotor-type hydraulic device is provided. [0011] Other objects and advantages of the present invention will become apparent from the accompanying drawings and the description thereof. The essential features of the present invention are described in the appended claims. Although the present invention has been described as a pump using only one fluid inlet and one fluid outlet, high pressure fluid can now be obtained by simply reversing the fluid inlet and outlet. It will be readily understood by those skilled in the art of hydraulic systems of this type that, once introduced at the entrance, the hydraulic system of the same construction operates as a motor. The term "housing" used in the following description and the appended claims includes not only the main housing member but also the pressure plate, gerotor assembly, manifold, and end cover, All of the latter components are connected to the main housing member by a plurality of bolts. Referring again to FIGS. 1 through 7, the gerotor type hydraulic apparatus includes a main housing member 20 having a flat axial inner end face, and a wear plate 21 sequentially mounted on the flat inner end face. Gerotor assembly 22, manifold 23, and end face cover 24,
Although all of these parts are integrally fixed by a plurality of bolts 25, each of the bolts is omitted in FIG. 1 but is shown in various other cross-sectional views.
However, each of the bolts 25 has a head that is pressed against the outer end on the right-hand side of the end face cover 24, and penetrates each of the members 24, 23, 22, and 21 from the head, and the inner end of the main housing member 20 It is well understood by those skilled in the art to be screwed tightly. Reference numeral 26 denotes an O-ring. The gerotor set 22 best illustrated in FIGS. 1 and 4 includes an internal tooth member 27 forming a stator,
And an external tooth member 28 cooperating as a rotor inside the internal tooth member 27. This rotor 28 rotates about its own axis A as shown in FIG. Since the axis A is eccentric with respect to the center axis B of the stator 27 in the direction of the eccentric line C by an interval shown between the axes A and B,
The rotor 28 rotates while drawing a trajectory around the central axis B of the stator 27. Rotor 28 with respect to stator 27
During this movement, the series of chambers 29 and 29a form a series of chambers whose volume constantly changes between the rotor 28 and the stator 27. The volume of each small chamber 29 gradually increases on one side of the eccentric line C, and the volume of each small chamber gradually decreases on the opposite side. The minimum volume chamber 29a shown in FIG. 4 approaches zero. This rotor 28 rotates in the direction indicated by arrow D in FIG. The rotor 28 has two flat axial end faces. The inlet means (inlet) to the housing is designated by the reference numeral 30. The fluid outlet means (outlet) is indicated by the reference numeral 31. The inlet means is a continuous annular groove in the main housing member 20 by means indicated only by dashed lines,
That is, it is connected so as to communicate with the distribution passage 32.
The annular groove 32 has a large number of through holes, that is, the communication passages 3.
Opening to the wear plate 21 with 3, the number of communication passages 33 is not critical and is sufficient to undertake the required flow of fluid. Each of the communication passages 33 is connected to a small-diameter annular groove formed on the opposite end face of the wear plate 21, that is, an annular fluid passage 34 by the communication passage 33 a. This annular fluid passage 34 opens into the rotor cavity towards gerotor set 22. The annular fluid passage 34 can be ring-shaped (FIGS. 1 and 3) or star-shaped. The annular fluid passage 34 is symmetrical, that is, a passage having a uniform diameter and a uniform depth. In contrast, the star-shaped annular fluid passage 34b is shaped by the area through which each annular fluid passage 37 of the rotor 28 passes while the rotor 28 rotates. That is, when a point on the outer periphery of the annular fluid passage 37 moves due to the rotation of the rotor 28, that point draws a fixed trajectory on the end face of the wear plate 21. This trajectory forms the star-shaped contour of the annular fluid passage 34b. The star-shaped annular fluid passage 34b varies in diameter and depth, and has a maximum width and a maximum depth at each projecting point of the annular fluid passage 34b. Each communication passage 33
a communicates with the annular fluid passage 34b at each projecting point of the star-shaped annular fluid passage 34b. Each of the internal teeth 27a of the stator 27 is inserted into each of the through holes 27b formed in the inner surface of the stator in the circumferential direction 180.
に よ っ て is provided by a cylinder 27a fitted over the ゜ and is maintained at equally spaced positions as shown in FIG. It should be understood that the end faces of each cylinder 27a are at the same level as the end faces of the stator 27. The rotor 28 has an open center hole 35 surrounded by an annular sealing band 36 that is not interrupted in the circumferential direction, but an annular liquid inflow passage 37 is formed radially outside the annular sealing band 36. Swing rod 3
The rotation axis of 8 is indicated by the symbol A in FIG.
The pivot axis of the orbital movement of the swinging rod 38 with respect to the stator 27 is indicated by reference numeral B in FIG. A straight line C connecting each point A and B is shown as an eccentric line here. The direction of movement of the rotor 28 is as shown by the arrow D in FIG. While rotating in this direction, the volume of each chamber 29 to the left of the eccentric line C gradually increases, but the volume of each chamber 29 to the right of the eccentric line gradually decreases as shown in FIG. The rotor 28 functions as a main valve for the hydraulic device. The six flow passages, that is, the through holes 37 a are provided in the annular fluid passage 3.
7 are arranged at equal intervals in the circumferential direction, and penetrate the rotor linearly in a direction parallel to the axis of the rotor 28. A part of each of the flow passages 37a protrudes radially inward from the annular fluid passage 37 as indicated by reference numeral 37b, and the amount of protrusion is about 1/8 "in one embodiment. In the structure shown in the figure, another flow passage is provided around the joint portion between the swinging rod 38 and the rotor 28 on the center axis of the rotor 28. The meshing surface between the spline and the gear is provided on the meshing surface. There is sufficient clearance so that fluid flow is not obstructed in this type of drive connection, and the annular fluid passage 34 and the annular fluid passage 37 when the hydraulic system is activated.
Communicates with Manifold 23 serves to connect the rotor valve to each chamber 29 of the gerotor. Manifold 2
3 is best illustrated in FIGS. 5, 5A and 6.
Seven mutually parallel through holes 40 extend through the surface of the manifold 23 facing the rotor 28 in parallel with its axis. This set of through-holes has a unique cross-sectional shape as best shown in FIGS. Here, the shape of each through hole 40 is referred to as a “compound trapezoid”. Referring to FIG. 5, one of each through-hole 40 appears to have two trapezoids having substantially no center partition facing each other, and both ends thereof are not completely parallel but are inclined radially. ing. The radially inner side of each through-hole is not a straight line, but is constituted by a concave curve slightly curved inward with a slightly higher vertex at the center 40a. FIG.
As shown in FIG. 4, the radially outer side of the through hole 40 is formed of two straight lines joined at the center thereof, or is formed of a convex curve slightly bulging radially outward.
The dimensions of each of these openings are circumferentially coincident with the openings between the two cylindrical through-holes 37a, as seen in FIG. The dimensions are between. When the hydraulic system is activated, these openings 40 communicate with the flow passages in the rotor 28 one after another. This achieves the basic flow switching action of the hydraulic system. As shown in FIGS. 6 and 6, the seven openings 41 formed at equal intervals on the side surface of the manifold 23 facing the gerotor are each fluid passage 41a inclined inward and downward as shown in FIG. 5A. Each of the fluid passages 42 is connected to one of the through holes 40. As shown by the solid line in FIG.
The three slanted fluid passages 42 drilled in 3 cooperate with the through holes 41, passages 41a and the structure associated with each through hole 40 as described immediately above. These cooperating passages are shown by dotted lines in FIG. 6 to show their cooperative state. The seven inclined passages 42 pass through a part of the manifold 23 from one side to the other side. Each of the inclined passages 42 has a slight inclination angle with respect to the axis of the gerotor and, as shown in FIGS. 5 and 6, the radial dimension connecting each inclined passage to the axis has an equal interval between the axis and the axis. . Therefore, each of the inclined passages 42 in the manifold merges or intersects with one of the passages 41a on the way through the manifold 23, so that each of the seven through holes 40 is combined with each of the passages 41a and 42. . The long rigid rocking rod 38 which can be clearly seen in FIG. 1 is shown in cross section in FIGS.
One end of the swinging rod 38 is connected to the drive shaft 44 by a spline connecting portion 44.
b. The drive shaft 44 is shown to have a solid outer end and a hollow inner end 44a. The opposite end of the swinging rod 38 is connected to the rotor at the open center hole 35 of the rotor 28 via a spline connecting portion 44c. Each spline connection at both ends allows the swinging rod 38 to orbit around each central axis A, B and to allow fluid to flow continuously over each connection. It is composed of In the discharge passage, an open center hole 35 of the rotor 28 that allows a flow to flow over the drive connection portion of the swinging rod 38, an open center hole 21a of the wear plate, and a hollow inner end 44a of the drive shaft. But finally the outlet 3
It is completed by four radial discharge passages 45, 46 which are connected as indicated by chain lines to 1. Needle bearings suitable for supporting the drive shaft 44 inside the main housing member 20 are located at positions 47 and 48. Further, as indicated by reference numerals 49 and 50, a suitable shaft sealing means is provided at a position where the drive shaft 44 projects outward from the main housing member 20. This device has been described as a pump utilizing a drive shaft 44 for power mounting to draw low pressure fluid from inlet 30 and discharge high pressure fluid from outlet 31. If the inflow port 30 and the outflow port 31 are used in reverse as described above, the hydraulic device operates as a motor that generates power to the drive shaft 44. Next, the operation of the pump will be described. The power is input to the left protruding end of the drive shaft 44 as viewed in FIG. Thereby, the drive shaft 44, the swing rod 38, the rotor 2
As the rotor 8 rotates, the rotor revolves in a trajectory with respect to the stator 27. As a result, since the volume of each small chamber 29 on the left side of the eccentric line C gradually increases, suction force is generated at the inflow port 30. Since the volumes of the small chambers 29 on the right side of the eccentric line C in FIG. 4 gradually decrease at the same time, high-pressure fluid is discharged from the outlet 31. The fluid sucked from the inflow port 30 passes through the annular groove 32 and the respective passages 33a, and the annular fluid passage 3
4 and then through the rotor 28, the annular fluid passage 37 and the cylindrical through-hole 37a, and further from each double trapezoidal opening of the manifold 23, i.e. through the through hole 40, through each of the manifold passages 41a and 42, Next, each of the small chambers 2 reaching the rotor through each through hole 41 of the manifold and gradually increasing.
9 is introduced. Each of the other small chambers 29 has another through hole 4
1 and each of the other passages 42 and 41a and the other double trapezoidal opening of the manifold, that is, the through hole 40, to the open center hole 35 of the rotor. The fluid is then swung rod 3
After cooling and lubrication while flowing around the play in the drive connection of the rotor 8 and the rotor 28, the central hole 21 of the wear plate 21
a passes through the hollow portion 44a of the drive shaft 44, and is finally discharged from the outlet 31 through the respective radial passages 45 and 46. If the star-shaped annular fluid passage 34b is incorporated into the rotary fluid pressure gerotor device, the area of fluid communication between the annular fluid passages 34b and 37 is limited to that of the simple annular annular groove 34 (FIG. 3). As a result, the resistance to the flow of the fluid is reduced. It should be noted that other passages in the gerotor device, such as, for example, annular fluid passage 37, also benefit from star-shaped projections. FIG. 8 shows a hydraulic apparatus according to a first embodiment of the present invention in which a fluid port is directly connected to a manifold plate. In this device, the fluid communication at the fluid inlet and outlet and the flow path switching action are performed between the end face of the rotor and the manifold plate 23D (that is, FIG.
9 of the cross-section) occurs in. In this apparatus, the fluid port 112 is formed by drilling the inner surface of the end plate 115
13 and to the annular fluid passage 119 through a series of through holes 114 that linearly penetrate the closing plate 116, each of the intermediate plates 117 and 118, and the manifold plate 23D. The annular passage 119 communicates with the annular groove 37b of the rotor. The fluid inlet / outlet 120 is connected to a series of through holes 122 penetrating through the intermediate plates 117 and 118 and the manifold plate 23D through the through holes 121 of the closing plate 116. A series of through holes 122
Communicates with the open center hole 35 of the rotor. The annular groove 37b and the passage 37A are
Provides hydraulic equilibrium to the rotor for the fluid pressure at. The other end of the rotor's open center hole 35 provides hydraulic equilibrium to the open center hole fluid passage. The manifold plate has a series of openings 40 and 41.
Having. A series of openings 40 extend through the manifold plate. The through hole 127 connected to the opening 40 is an extension of the opening 40 penetrating the manifold plate. The opening 40 of each pair and the through hole 127 are connected to each other through a series of communication passages 108 formed in the intermediate plate 117. During operation of the apparatus, the annular groove 37 of the rotor and the open center hole 35 selectively communicate with each opening or through hole 40 to switch the flow path thereof. The actual outlet and inlet passages in the manifold outlet and inlet hydraulic system of FIG.
Determined through the selective use of ~ 118 and 23D.
Each of the plates is designed to be easily manufactured individually. 9 to
12 See. During assembly, the plates are arranged in an appropriate sequence with respect to the other plates to form the desired outlet and inlet passages of the hydraulic system. If necessary, sealing elements may be interposed between the plates to ensure that leakage between adjacent passages is within an acceptable amount, in which case the plates form a single unit after assembly. Should be welded together or other suitable sealing measures should be taken. FIG. 13 shows a hydraulic apparatus according to a second embodiment of the type in which fluid inlets and outlets are arranged in a number of intermediate plates. The device path
It is incorporated in the water steering unit 127. The fluid passages arranged around the sliding members 129, 129a as a number of annular recessed grooves 128, 128a include a second cylinder (C2), a second return (R2), a first cylinder (C1), First intermediate (M1), second pressure (P
2) The order of the first return (R1) and the first pressure (P1). The first cylinder (C1) and the second cylinder (C
The passages in 2) are respectively connected to both ends of a double-acting cylinder for steering (not shown) through passages 150 and 151 in the power steering units 127 and 127a, fluid inlets and outlets 152 and 153, and a high-pressure hose (not shown). Is done. Each passage of the first pressure (P1) and the second pressure (P2) is provided with a power steering unit 127,
The hydraulic pump 127 is connected to a high-pressure outlet of a hydraulic pump driven by an engine (not shown) via each passage 154, 155, a fluid inlet 156, and a high-pressure hose. Each of the first return (R1) and the second return (R2) has a low pressure of a hydraulic pump (not shown) via a passage 157, a passage 158, a fluid outlet 159, and a high pressure hose of the power steering units 127, 127a. Connected to the entrance. Power steering units 127 and 12
The center passage 131 of 7a communicates with the drive hole 141 of this device and the inner fluid passage. Power steering unit 127, 12
The first intermediate (M1) passage of FIG.
And the outer fluid passage. In operation, the selective rotation of the input shaft 142 causes the axial movement of the sliding members 129, 129a via the pin helical groove connection 143 within the limits of movement allowed by the torsion spring connection 144 with the wobble rod 145. It is converted to motion, but only to direct rotation of the rocking bar thereafter. The axial movement of the sliding members 129, 129a causes the respective annular recessed grooves 128, 128a to move into the respective passages 130, 129a.
131 is selectively connected. In the rotational position shown in FIG. 13 , the passage 130 is connected to the second pressure (P2) passage via the first intermediate (M1) passage, and the unit 12
7 is connected to the second cylinder passage. The fluid from the through passage 130 is supplied to each of the plates 133, 1
Through the through passages 132 of the first and second plates 136 and the communication passage 138 of the next plate 136, the water flows into seven outer through holes 139 arranged annularly in the last plate 137. The fluid from each outer through-hole 139 of the plate 137 communicates with some of the seven inner through-holes 34 arranged annularly inside the outer through-hole 139 via the adjacent annular groove 37. Each inner through hole 34 penetrates each plate 137, 136 and 135 and communicates with seven spiral passages 140 formed in the next plate 134, and each spiral passage 140 has seven through holes 41. Communicate with one of the Each through hole 41
All pass through the plates 135, 136 and 137 and finally open into the respective chambers of the gerotors of the units 127, 127a. In the embodiment of FIG . 13, fluid communication and flow paths
The switching action takes place in the plane of FIG. Each outer through hole 13
Reference numeral 9 denotes each of the through holes 41 on the side connected to each of the gradually increasing chambers of the gerotor through each of the through holes 34, but each of the through holes on the side connected to each of the gradually decreasing chambers. The fluid from the hole 41 is supplied to the drive shaft 1 at the center of the rotor.
It is in direct communication with the central passage 131 of this unit via 41. When rotating in the opposite direction, everything is reversed. Each of the plates 133 to 1 in these hydraulic devices is
37 are welded together to form an integral unitary structure. [0043] In the hydraulic system shown in FIG. 13, Pawasu
Each fluid inlet / outlet and each annular concave groove (P1, R1, P2, M1, C1, R) in the body 127 of the tearing unit.
2 and C1) and all the fluid passages connecting them must be cast and / or machined. This involves a number of time and labor consuming manufacturing operations. While the preferred embodiment of the invention has been illustrated and described as above, this is merely illustrative and should not be construed as limiting.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a central longitudinal sectional view of a gerotor type hydraulic device for illustrating an operation principle . FIG. 2 is a cross-sectional view as viewed from a direction indicated by an arrow finger line 2-2 in FIG. FIG. 3 is a cross-sectional view as viewed from a direction indicated by an arrow finger line 3-3 in FIG. 1; FIG. 4 is a cross-sectional view as viewed from the direction indicated by arrow 4-4 in FIG. 1; 5 is a transverse cross-sectional view as viewed from a direction indicated by an arrow finger line 5-5 in FIG. 1, and FIG. 5A is a partial cross-sectional view as viewed from a direction indicated by an arrow finger line 5A-5A in FIG. FIG. 6 is a transverse cross-sectional view as viewed from a direction indicated by an arrow finger line 6-6 in FIG. 1; FIG. 7 is a transverse cross-sectional view as seen from the direction indicated by arrow 7-7 in FIG. 1; FIG. 8 is a central longitudinal sectional view of the gerotor type hydraulic apparatus according to the embodiment of the present invention. [9] arrow-line in FIG. 8 9 - 8 seen from the direction indicated by 9
FIG. 3 is a cross-sectional view showing one end surface of the manifold plate of FIG. End view showing the other end surface of the manifold plate of Figure 8 as seen from the direction shown by 10 - Figure 10 arrow-line 10 in FIG. 8. End view of the outer end surface of the passage blocking plate of FIG. 8 as seen from the direction shown by 11 - 11 arrow-line 11 in FIG. 8. End view of the inner end face of the end plate of Figure 8 as seen from the direction shown by 12 - Figure 12 arrow-line 12 in FIG. 8. FIG. 13 is a central longitudinal sectional view of the second embodiment having an intermediate plate gerotor fluid inlet / outlet passage. Sectional view showing a section of the fluid inlet and outlet passages 13 as seen from the direction shown by 14 - Figure 14 arrow-line 14 in FIG. 13. Cross sectional view showing a next portion of the fluid inlet and outlet passages 13 as seen from the direction shown by 15 - Figure 15 arrow-line 15 in FIG. 13. Sectional view showing still following sites fluid port passages 13 as seen from the direction shown by 16 - Figure 16 arrow-line 16 in FIG. 13. Sectional view showing a one more following sites fluid port passages 13 as seen from the direction shown by 17 - FIG. 17 arrow-line 17 in FIG. 13. Sectional view more showing the next site of the fluid inlet and outlet passages 13 as seen from the direction shown by 18 - Figure 18 arrow-line 18 in FIG. 13. DESCRIPTION OF SYMBOLS 20; 60: Main housing 22; 62: Gerotor group 23; 63: Manifold plate 27; 62a: Stator 28; 72: Rotor 29; 80: Gerotor chamber 30; 66: Fluid inlet 31; 85: Fluid Outlet 38; 71: swing rod 44; 70: drive shaft

Continuation of front page    (72) Inventor Hollis Newcomb White, Ju               near               United States Kentucky               42240 Hopkinsville, Pile Lay               N 243                (56) References JP-A-49-59302 (JP, A)                 US Patent No. 2023738 (US, A)

Claims (1)

(57) [Claims] A housing, a rotor having a flat axial end face rotatably engaging the housing in one plane;
A gerotor-type hydraulic device comprising a plurality of gerotor chambers, an inlet and an outlet, wherein the hydraulic device is disposed in the rotor.
A pair of flow passages , a means for connecting one of the pair of flow passages to one of the inlet and the outlet on the plane, and a flow passage for connecting the other of the pair of flow passages on the same plane. Means for connecting to the other of the inlet and the outlet;
When the hydraulic system is activated , the fluid connection on one side of the rotor
Constituted by a means disposed within said housing in the same plane for selectively connecting said pair of flow-passage as occurs for passing and the flow path switching action to the gerotor of the respective chamber, the gerotor hydraulic apparatus. 2. 2. The gerotor type hydraulic apparatus according to claim 1, further comprising an input / output shaft and a rocking rod, wherein the plane on which the fluid communication and the flow path switching action occur is driven by the rocking rod to the input / output shaft. A gerotor-type hydraulic device on the same side as one side of the rotor to be electrically connected. 3. 2. The gerotor type hydraulic apparatus according to claim 1, further comprising an input / output shaft and a rocking rod, wherein the plane on which the fluid communication and the flow path switching action occur is driven by the rocking rod to the input / output shaft. A gerotor-type hydraulic device on one side and the other side of the rotor to be connected in series. 4. One of the pair of flow passages is one of the axial end faces.
Extending from one side to the other through the rotor.
1. A gerotor-type hydraulic device. 5. The one of the pair of flow passages is connected to the pair of flow passages.
5. The gerotor type of claim 4 surrounding the other of the passages.
Hydraulic equipment. 6. One of the pair of flow passages is flat with the rotor.
Penetrating the rotor from one of the axial end faces,
2. The gellow of claim 1, including a bore extending substantially on an axis.
Type hydraulic device.