CN112177875A - Swash plate driving flow distribution integrated variable displacement plunger pump - Google Patents
Swash plate driving flow distribution integrated variable displacement plunger pump Download PDFInfo
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- CN112177875A CN112177875A CN202011047508.9A CN202011047508A CN112177875A CN 112177875 A CN112177875 A CN 112177875A CN 202011047508 A CN202011047508 A CN 202011047508A CN 112177875 A CN112177875 A CN 112177875A
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- 238000006073 displacement reaction Methods 0.000 title claims description 24
- 230000007704 transition Effects 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000005192 partition Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 74
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005315 distribution function Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/141—Details or component parts
- F04B1/146—Swash plates; Actuating elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
- F04B1/124—Pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/141—Details or component parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/141—Details or component parts
- F04B1/143—Cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/141—Details or component parts
- F04B1/145—Housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/28—Control of machines or pumps with stationary cylinders
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention relates to a swash plate driving flow distribution integrated variable plunger pump, which comprises a main shaft, a cylinder body, a front shell, a swash plate, a plunger, a piston shoe, a return assembly and a variable device, wherein the swash plate is rotatably arranged in the front shell, the end surface of the cylinder body opposite to the swash plate is provided with a plunger hole, the plunger is in sliding fit with the plunger hole, the piston shoe is arranged in the return assembly, the return assembly is attached to the inclined surface of the swash plate, the end surface of the swash plate is provided with a high-pressure oil cavity and a low-pressure oil cavity, the outer circular surface of the front shell is provided with an oil inlet and an oil outlet, the oil outlet is communicated with the high-pressure oil cavity, the main shaft is provided with a main shaft central hole, the main shaft central hole is respectively communicated with the oil inlet and the low-pressure oil cavity, The invention relates to the technical field of axial plunger pumps, and the power density and the reliability are high.
Description
Technical Field
The invention relates to the technical field of axial plunger pumps, in particular to a swash plate driving flow distribution integrated variable displacement plunger pump.
Background
The swash plate type axial plunger pump is a common hydraulic element in a hydraulic transmission system, and is widely applied due to the outstanding advantages of compact structure, high pressure, long service life and the like compared with other hydraulic pumps.
The swash plate axial piston pump can be roughly divided into a conventional swash plate axial piston pump and a rotary swash plate axial piston pump in terms of structure.
The traditional swash plate type axial variable plunger pump adopts a transmission mode that a main shaft drives a cylinder body to rotate through a spline, and the flow distribution is carried out on the end surface of the bottom of the cylinder body by using a flow distribution plate; the swash plate can swing around a rotating shaft in a certain diameter direction, and the two sides of the swash plate are respectively provided with a return spring and a variable piston, so that the angle of the swash plate is adjusted, the axial effective stroke of the plunger is changed, and the variable is realized. The traditional swash plate type axial variable plunger pump has the defects that a plurality of pairs of high-speed friction pairs, namely a cylinder body-valve plate, a sliding shoe-swash plate and a plunger-plunger hole, particularly the cylinder body-valve plate friction pairs are easy to damage and low in working reliability due to the overturning moment of the cylinder body. And the rotating parts are more, and the variable structure is more complicated, leads to the plunger pump whole volume great. Meanwhile, the cylinder body-valve plate and the sliding shoe-swash plate are rotary friction pairs, so that the starting torque and the friction torque of the plunger pump are large.
The swash plate axial plunger pump is divided into an axial flow distribution type and a valve flow distribution type, and adopts a transmission mode that a cylinder body is fixed and a main shaft drives a swash plate to rotate to drive a plunger. The shaft flow distribution mode adopts a flow distribution shaft to distribute flow at the bottom of the cylinder body; the bottom of the cylinder body is provided with an oil suction valve group and an oil discharge valve group in a valve flow distribution mode.
The axial flow distribution type swash plate axial plunger pump drives a swash plate to rotate through a key by a main shaft, a cylinder body is fixed, a flow distribution shaft needs to be arranged at the bottom of the cylinder body, variable cannot be realized, and the axial size is large.
The valve flow distribution type swash plate axial plunger pump has the structure that a main shaft drives a swash plate to rotate through a key, a cylinder body is fixed, an oil suction valve combined oil discharge valve group is arranged at the bottom of the cylinder body, variable cannot be realized, and the axial size is large.
Therefore, there is a need for improvements in the prior art.
Disclosure of Invention
In order to overcome the defects in the prior art, the swash plate driving flow distribution integrated variable displacement plunger pump is small in size, high in power density and reliability, and low in starting torque and friction torque.
In order to solve the technical problems, the invention adopts the technical scheme that:
a swash plate driving flow distribution integrated variable plunger pump comprises a main shaft, a cylinder body, a front shell, a swash plate, a plunger, a sliding shoe and a return assembly, wherein the front shell is fixedly connected with the cylinder body;
the end face of the cylinder body opposite to the swash plate is provided with a plunger hole, a plunger is in sliding fit with the plunger hole, a piston shoe is arranged in a return assembly, the plunger and the piston shoe are in spherical hinge joint to form a plunger piston shoe assembly, an oil passing hole is formed in the return assembly, one end of a plunger center hole of the plunger piston shoe assembly is communicated with the oil passing hole, the other end of the plunger center hole is communicated with the plunger hole in the cylinder body, and the return assembly is attached to the inclined surface of the swash plate;
the end surface of the swash plate is provided with a high-pressure oil cavity and a low-pressure oil cavity, the low-pressure oil cavity is communicated with the central hole of the swash plate, and the high-pressure oil cavity is communicated with the outer circular surface of the swash plate;
an oil inlet and an oil outlet are formed in the outer circular surface of the front shell, and the oil outlet is communicated with the high-pressure oil cavity;
the main shaft is provided with a main shaft center hole, the side surface of the main shaft is provided with a radial hole communicated with the main shaft center hole, and the main shaft center hole is respectively communicated with the oil inlet and the low-pressure oil cavity through the radial hole.
The variable device comprises a variable piston, a variable transition sliding block and an electromagnet, the variable piston is arranged in a center hole of the cylinder body in a sliding mode and fixed with the circumference of the main shaft, a variable spring is arranged between the variable piston and the main shaft, the variable transition sliding block is arranged in the center hole of the cylinder body in a sliding mode, a thrust needle roller bearing is arranged between the variable transition sliding block and the variable piston, the electromagnet pushes the variable transition sliding block to slide through an iron core, a pressure relief hole is formed between each plunger hole and the center hole of the cylinder body, and the left and right movement of the variable piston is controlled by changing the thrust of the.
Furthermore, the return assembly comprises a return flow distribution plate, a return partition plate and a return pressure plate, the return flow distribution plate, the return partition plate and the return pressure plate are sequentially arranged and fixedly connected through rivets, a sliding shoe is arranged between the return flow distribution plate and the return pressure plate, semicircular holes are formed in the return partition plate and the return pressure plate, the sliding shoe is sleeved in the semicircular holes, a ball bowl is arranged between the return assembly and the cylinder body, an inner spherical surface is arranged on the return flow distribution plate, the inner spherical surface of the return flow distribution plate is matched with an outer spherical surface of the ball bowl, and a central spring is arranged between the ball bowl and the cylinder body.
Furthermore, an oblique cutting surface is arranged on the circumferential surface of the variable piston matched with the central hole of the cylinder body, the oblique cutting surface side of the variable piston corresponds to the high-pressure oil cavity side of the swash plate, the opening of the oblique cutting surface is gradually reduced from the end surface, one end of the variable piston matched with the central hole of the main shaft is in a shifting fork shape, and the main shaft is connected with the variable piston through a transmission pin.
Further, a tapered roller bearing is arranged between the swash plate and the front housing.
Furthermore, a high-pressure oil cavity of the swash plate is communicated with the outer circular surface of the swash plate through a high-pressure radial hole, an annular oil groove is arranged on the front shell body and corresponds to the high-pressure radial hole, and the annular oil groove is communicated with the oil outlet.
Furthermore, sealing devices are arranged between the main shaft and the front shell and between the main shaft and the swash plate.
Furthermore, a positioning boss is arranged on the main shaft, the main shaft and one end of the swash plate are positioned through the positioning boss, and the main shaft and the other end of the swash plate are positioned through an elastic check ring for a shaft.
Furthermore, a needle bearing is arranged between the main shaft and the central hole of the cylinder body.
Further, the low-pressure oil chamber is arranged on one side of the inclined plane from high to low when the swash plate rotates, and the high-pressure oil chamber is arranged on one side of the inclined plane from low to high when the swash plate rotates.
Compared with the prior art, the invention has the following beneficial effects:
1. the flow distribution function is integrated on the swash plate, oil suction and discharge are realized on the surface of the swash plate, the flow distribution plate structure of the traditional plunger pump is cancelled, and the working reliability of the plunger pump is improved.
2. Compared with the traditional swash plate type axial plunger pump, the variable plunger pump adopts a novel variable mechanism, realizes the variable function, has simple and compact structure and reduces the volume of the plunger pump.
3. Compare traditional swash plate formula axial plunger pump, cylinder body and back casing unification have simplified the cylinder body structure, have reduced plunger pump volume, have improved power density.
4. Compared with the traditional rotary swash plate type axial plunger pump, the axial plunger pump realizes flow distribution on the surface of the swash plate, and a flow distribution valve or a flow distribution shaft is not required to be arranged at the position of the cylinder body, so that the axial volume of the plunger pump is reduced, and the power density is improved.
5. In the oil absorption process, the radial holes of the main shaft and the swash plate rotate at high speed along with the main shaft and the swash plate, so that oil in the radial holes is subjected to the action of centrifugal force, and the oil absorption characteristic is improved.
6. Compared with the traditional swash plate type axial plunger pump, the axial plunger pump has fewer rotating parts and small rotational inertia.
7. Compared with the traditional swash plate type axial plunger pump, the swash plate type axial plunger pump has the advantages that a pair of rotary friction pairs is reduced, and the starting torque and the friction torque are small.
Drawings
The following will explain embodiments of the present invention in further detail through the accompanying drawings.
FIG. 1 is a cross-sectional view of an axially variable displacement plunger pump.
FIG. 2 is a cross-sectional view of the axial variable displacement plunger pump taken along line A-A;
FIG. 3 is an exploded view of the return assembly;
FIG. 4 is a front sectional view of the swash plate;
FIG. 5 is a side sectional view of a swash plate;
FIG. 6 is a spatial structure view of a swash plate;
fig. 7 is a schematic diagram of a variable piston structure.
In the figure: the device comprises a main shaft 1, a plunger hole 2, a plunger hole 3, a front shell, a semicircular key 4, a tapered roller bearing 5, a swash plate 6, an elastic retainer ring for a shaft 7, a ball bowl 8, a slipper 9, a central spring 10, a needle bearing 11, a plunger 12, a cylinder body 13, an electromagnet 14, a variable transition sliding block 15, a thrust needle bearing 16, a variable sliding block 17, a variable spring 18, a transmission pin 19, a return pressure plate 20, a return baffle 21, a rivet 22, a return flow distributing plate 23, an oil passing hole 24, a high-pressure oil cavity 25, a low-pressure oil cavity 26, an oil inlet 27, an oil outlet 28, a main shaft central hole 29, a main shaft central hole 30, a high-pressure radial hole 31 and an annular oil groove 32.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1 to 7, a swash plate driven flow distribution integrated variable displacement plunger pump comprises a main shaft 1, a cylinder block 13, a front housing 3, a swash plate 6, a plunger 12, a slipper 9 and a return assembly, wherein the front housing 3 is fixedly connected with the cylinder block 13, the swash plate 6 is rotatably arranged in the front housing 3, and the main shaft 1 is connected with the swash plate 6 through a semicircular key;
the end face of the cylinder body 13 opposite to the swash plate 6 is provided with a plunger hole 2, a plunger 12 is in sliding fit with the plunger hole 2, a slipper 9 is arranged in a return assembly, the plunger 12 is in ball hinge joint with the slipper 9 to form a plunger slipper assembly, an oil passing hole 24 is arranged in the return assembly, one end of a plunger center hole of the plunger slipper assembly is communicated with the oil passing hole, the other end of the plunger center hole is communicated with the plunger hole 2 on the cylinder body, and the return assembly is attached to the inclined plane of the swash plate 6;
the return assembly comprises a return flow distribution plate 23, a return partition plate 21 and a return pressure plate 20, the return flow distribution plate 23, the return partition plate 21 and the return pressure plate 20 are sequentially arranged and fixedly connected through rivets 22, a ball bowl 8 is arranged between the return assembly and the cylinder body 13, an inner spherical surface is arranged on the return flow distribution plate 23, the inner spherical surface of the return flow distribution plate 23 is matched with an outer spherical surface of the ball bowl 8, a central spring 10 is arranged between the ball bowl 8 and the cylinder body 13, and the ball bowl is tightly pressed through the central spring 10 so that the return flow distribution plate of the return assembly is always attached to the inclined surface of the swash plate 6.
The thickness of the return baffle plate 21 is 0.02mm thicker than the flange of the sliding shoe 9, the clearance between the return pressure plate 20 and the return flow distribution plate 23 is used for mounting the sliding shoe 9, the sliding shoe 9 is sleeved in the semicircular holes on the return pressure plate 20 and the return baffle plate 21, the return assembly does not rotate in the circumferential direction and is static relative to the sliding shoe 9 in the operation process, the return flow distribution plate 23 is provided with oil passing holes 24, and the positions of the oil passing holes 24 correspond to the central holes of the sliding shoe 9 one by one.
The end face of the swash plate 6 is provided with a high-pressure oil chamber 25 and a low-pressure oil chamber 26, the low-pressure oil chamber 26 is arranged on one side of the inclined plane from high to low when the swash plate 6 rotates, the high-pressure oil chamber 25 is arranged on one side of the inclined plane from low to high when the swash plate 6 rotates, the low-pressure oil chamber 26 is communicated with the central hole of the swash plate 6, an oil inlet 27 and an oil outlet 28 are arranged on the outer circumferential surface of the front shell 3, the oil outlet 28 is communicated with the high-pressure oil chamber 25, the high-pressure oil chamber 25 of the swash plate 6 is communicated with the outer circumferential surface of the swash plate through a high-pressure radial hole 31.
The main shaft 1 is provided with a main shaft central hole 29, the side surface of the main shaft 1 is provided with a radial hole communicated with the main shaft central hole 29, and the main shaft central hole 29 is respectively communicated with the oil inlet 27 and the low-pressure oil cavity 26 through the radial hole.
The variable device comprises a variable piston 17, a variable transition sliding block 15 and an electromagnet 14, wherein the variable piston 17 is arranged in a central hole of a cylinder body 13 in a sliding mode and fixed with a main shaft 1 in the circumferential direction, a variable spring 18 is arranged between the variable piston 17 and the main shaft 1, the variable transition sliding block 15 is arranged in the central hole of the cylinder body 13 in the sliding mode, a thrust needle bearing 16 is arranged between the variable transition sliding block 15 and the variable piston 17, the electromagnet 14 pushes the variable transition sliding block 15 to slide through an iron core, one end, matched with the central hole 29 of the main shaft, of the variable piston 17 is in a shifting fork shape, the main shaft 1 and the variable piston 17 are connected through a transmission pin 19, a pressure relief hole 30 is arranged between a plunger hole 2 and the central hole of the cylinder body 13, a chamfer plane is arranged on one half of circumferential surfaces, matched with the central hole of the variable, the pressure relief hole is communicated with the central hole of the main shaft, when the pressure relief hole is positioned on the cylindrical surface of the variable piston 17, the pressure relief hole is in a closed state, and the magnetic force of the electromagnet 14 is changed to control the variable piston 17 to move left and right so as to control the opening and closing of the pressure relief hole 30 and the size of the opening.
A tapered roller bearing 5 is provided between the swash plate 6 and the front housing 3.
Sealing devices are arranged between the main shaft 1 and the front shell 13 and between the main shaft 1 and the swash plate 6.
The main shaft 1 is provided with a positioning boss, the main shaft 1 and one end of the swash plate 6 are positioned through the positioning boss, and the main shaft 1 and the other end of the swash plate 6 are positioned through the elastic retaining ring 7 for the shaft.
A needle bearing 11 is arranged between the main shaft 1 and the central hole of the cylinder 13.
The swash plate driving flow distribution integrated axial variable plunger pump works according to the following principle:
when the main shaft 1 drives the swash plate 6 to rotate clockwise, the central spring 10 enables the return flow distribution plate 23 to always cling to the swash plate 6 to slide through the spherical hinge pair, the return assembly is driven by the acting force of the rotating swash plate 6 to drive the plunger 12 to reciprocate in the plunger hole of the cylinder body 13, and the cylinder body 13 is static.
When the plunger 12 extends out of the plunger hole 2, the piston shoe 9 is positioned at the position of the low-pressure oil cavity of the swash plate 6, the closed volume in the plunger hole 2 is gradually increased, the pressure is reduced, oil enters the inner cavity of the plunger pump from an oil inlet 27 on the front shell, reaches the central hole 29 of the main shaft through the radial hole on the cylinder body 13 and the radial hole on the main shaft 1, further reaches the low-pressure oil cavity 26 through the central hole 29 of the main shaft and the radial hole on the swash plate 6, and finally reaches the cavity of the plunger through the oil hole 24 of the return flow distributing plate 23 and the central hole of the piston shoe.
When the plunger 12 retracts into the plunger hole 2, the piston shoe 9 is located at the position of the high-pressure oil cavity of the swash plate 6, the closed volume in the plunger hole 2 is gradually reduced, the pressure is increased, oil enters the high-pressure oil cavity 25 through the central hole of the piston shoe 9 and the oil passing hole 24 of the return flow distribution plate, finally reaches the annular oil groove 32 in the inner wall of the front shell 3 through the high-pressure radial hole 31 of the swash plate 6, and is discharged through the oil outlet 28, and the oil discharging process is realized.
When the main shaft 1 drives the swash plate 6 to rotate for a circle, each plunger 12 absorbs and discharges oil once, and each plunger 12 continuously and independently completes the oil absorption and discharge actions along with the continuous rotation of the main shaft 1, so that the plunger pump continuously works.
Swash plate driving flow distribution integrated axial variable plunger pump variable principle:
the electromagnet 14 pushes the variable piston 17 to axially slide along the cylinder body 13 through the variable transition sliding block 15 and the thrust needle bearing 16, and when the variable piston 17 slides leftwards in the central hole of the cylinder body, the pressure relief holes 30 on one side of the inclined tangent plane of the variable piston 17 are covered by the inclined tangent plane of the variable piston 17 one by one; the relief holes 30 at the chamfered side of the variable piston 17 are exposed one by one during the variable piston 17 slides rightward in the center hole of the cylinder.
Because the variable piston 17 is corresponding to the high-pressure oil chamber side of the swash plate on the side of the diagonal plane, and the variable piston 17 always keeps synchronous rotation with the main shaft 1 and the swash plate 6 during the working process, the plunger hole 2 on the side of the diagonal plane of the variable piston 17 is always in the oil discharge state.
When the variable piston 17 is positioned at the rightmost side in the figure 1, the pressure relief holes 30 at the bottoms of the plunger holes 2 of the cylinder body at one side of the inclined cutting plane of the variable piston 17 are all exposed, at the moment, all plunger hole cavities in the oil discharging process are communicated with the cavity in the plunger pump through the pressure relief holes 30 and further communicated with an oil inlet of the plunger pump, all hydraulic oil in the plunger holes 2 in the oil discharging process cannot reach high pressure and is discharged through an oil outlet of the plunger pump, and at the moment, the plunger pump is at zero displacement, namely minimum displacement.
When the variable piston 17 is positioned at the leftmost side in fig. 1, all the pressure relief holes at the bottoms of the plunger holes of the cylinder 14 positioned at the diagonal plane side of the variable piston 17 are covered, all the plunger holes positioned in the oil discharge process are not communicated with the cavity inside the plunger pump, all the plunger holes 2 positioned in the oil discharge process can complete the normal oil discharge process, and the plunger pump is positioned at the maximum displacement.
When the variable piston 17 moves from the rightmost position to the leftmost position, the number of all the plunger holes 2 which are in the oil discharge process and can complete the normal oil discharge process is gradually increased, and the displacement of the corresponding plunger pump is gradually increased; conversely, when the variable displacement piston 17 moves from the leftmost position to the rightmost position, the displacement of the plunger pump is gradually reduced, thereby achieving the variable displacement of the plunger pump.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (9)
1. A swash plate driving flow distribution integrated variable displacement plunger pump is characterized in that: the variable displacement swash plate mechanism comprises a main shaft (1), a cylinder body (13), a front shell (3), a swash plate (6), a plunger (12), a slipper (9), a return stroke assembly and a variable device, wherein the front shell (3) is fixedly connected with the cylinder body (13), the swash plate (6) is rotatably arranged in the front shell (3), and the main shaft (1) is in key connection with the swash plate (6);
a plunger hole (2) is formed in the end face, opposite to the swash plate (6), of the cylinder body (13), a plunger (12) is in sliding fit with the plunger hole (2), a piston shoe (9) is arranged in the return stroke assembly, the plunger (12) is in ball hinge with the piston shoe (9) to form a plunger piston shoe assembly, an oil passing hole (24) is formed in the return stroke assembly, one end of a plunger center hole of the plunger piston shoe assembly is communicated with the oil passing hole, the other end of the plunger center hole is communicated with the plunger hole (2) in the cylinder body, and the return stroke assembly is attached to the inclined plane of the swash plate (6);
a high-pressure oil cavity (25) and a low-pressure oil cavity (26) are arranged on the end face of the swash plate (6), the low-pressure oil cavity (26) is communicated with a central hole of the swash plate (6), and the high-pressure oil cavity (25) is communicated with the outer circular surface of the swash plate (6);
an oil inlet (27) and an oil outlet (28) are formed in the outer circular surface of the front shell (3), and the oil outlet (28) is communicated with the high-pressure oil cavity (25);
a main shaft center hole (29) is formed in the main shaft (1), a radial hole communicated with the main shaft center hole (29) is formed in the side face of the main shaft (1), and the main shaft center hole (29) is communicated with the oil inlet (27) and the low-pressure oil cavity (26) through the radial hole;
the variable device comprises a variable piston (17), a variable transition sliding block (15) and an electromagnet (14), wherein the variable piston (17) is arranged in a center hole of a cylinder body (13) in a sliding mode and fixed with the circumference of a main shaft (1), a variable spring (18) is arranged between the variable piston (17) and the main shaft (1), the variable transition sliding block (15) is arranged in the center hole of the cylinder body (13) in a sliding mode, a thrust needle roller bearing (16) is arranged between the variable transition sliding block (15) and the variable piston (17), the electromagnet (14) pushes the variable transition sliding block (15) to slide through an iron core, a pressure relief hole (30) is arranged between a plunger hole (2) and the center hole of the cylinder body (13), and the left-right movement of the variable piston (17) is controlled by changing the thrust of the electromagnet (14) so.
2. The swash plate driven, flow distributing integrated variable displacement piston pump as claimed in claim 1, wherein: the return assembly comprises a return flow distribution plate (23), a return partition plate (21) and a return pressure plate (20), the return flow distribution plate (23), the return partition plate (21) and the return pressure plate (20) are sequentially arranged and fixedly connected through rivets (22), the sliding shoes (9) are arranged between the return flow distribution plate (23) and the return pressure plate (20), semicircular holes are formed in the return flow distribution plate (21) and the return pressure plate (20), the sliding shoes (9) are sleeved in the semicircular holes, a ball bowl (8) is arranged between the return assembly and the cylinder body (13), an inner spherical surface is arranged on the return flow distribution plate (23), the inner spherical surface of the return flow distribution plate (23) is matched with an outer spherical surface of the ball bowl (8), and a central spring (10) is arranged between the ball bowl (8) and the cylinder body (13).
3. The swash plate driven, flow distributing integrated variable displacement piston pump as claimed in claim 1, wherein: the variable piston (17) is provided with a chamfer on the half circumference surface matched with the center hole of the cylinder body, the chamfer side of the variable piston (17) corresponds to the high-pressure oil cavity side of the swash plate (6), the opening of the chamfer is gradually reduced from the end surface, the end matched with the center hole (29) of the main shaft of the variable piston (17) is in a fork shape, and the main shaft (1) is connected with the variable piston (17) through a transmission pin (19).
4. The swash plate driven, flow distributing integrated variable displacement piston pump as claimed in claim 1, wherein: a tapered roller bearing (5) is arranged between the swash plate (6) and the front shell (3).
5. The swash plate driven, flow distributing integrated variable displacement piston pump as claimed in claim 1, wherein: a high-pressure oil cavity (25) of the swash plate (6) is communicated with the outer circular surface of the swash plate through a high-pressure radial hole (31), an annular oil groove (32) is arranged on the front shell (3) and corresponds to the high-pressure radial hole (31), and the annular oil groove (32) is communicated with an oil outlet (28).
6. The swash plate driven, flow distributing integrated variable displacement piston pump as claimed in claim 1, wherein: sealing devices are arranged between the main shaft (1) and the front shell (13) and between the main shaft (1) and the swash plate (6).
7. The swash plate driven, flow distributing integrated variable displacement piston pump as claimed in claim 1, wherein: the main shaft (1) is provided with a positioning boss, the main shaft (1) and one end of the swash plate (6) are positioned through the positioning boss, and the other ends of the main shaft (1) and the swash plate (6) are positioned through an elastic check ring (7) for a shaft.
8. The swash plate driven, flow distributing integrated variable displacement piston pump as claimed in claim 1, wherein: a needle bearing (11) is arranged between the main shaft (1) and the central hole of the cylinder body (13).
9. The swash plate driven, flow distributing integrated variable displacement piston pump as claimed in claim 1, wherein: the low-pressure oil chamber (26) is arranged on one side of the inclined plane from high to low when the swash plate (6) rotates, and the high-pressure oil chamber (25) is arranged on one side of the inclined plane from low to high when the swash plate (6) rotates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011047508.9A CN112177875B (en) | 2020-09-29 | 2020-09-29 | Swash plate driving flow distribution integrated variable displacement plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011047508.9A CN112177875B (en) | 2020-09-29 | 2020-09-29 | Swash plate driving flow distribution integrated variable displacement plunger pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112177875A true CN112177875A (en) | 2021-01-05 |
| CN112177875B CN112177875B (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011047508.9A Expired - Fee Related CN112177875B (en) | 2020-09-29 | 2020-09-29 | Swash plate driving flow distribution integrated variable displacement plunger pump |
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| Country | Link |
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| CN (1) | CN112177875B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115234462A (en) * | 2022-07-29 | 2022-10-25 | 杭州力龙液压有限公司 | Cylinder body structure, hydraulic power mechanism and engineering machinery |
| CN115507011A (en) * | 2022-09-13 | 2022-12-23 | 厦门大学 | Plunger machine swash plate two-dimensional shimmy suppression device with double springs, mass and liquid resistance |
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| DE10300070A1 (en) * | 2002-11-15 | 2004-06-03 | Brueninghaus Hydromatik Gmbh | Axial piston machine, retraction plate and method for producing a retraction plate |
| JP2018155193A (en) * | 2017-03-17 | 2018-10-04 | 日立建機株式会社 | Liquid pressure rotation machine |
| CN109236598A (en) * | 2018-11-08 | 2019-01-18 | 四川航天烽火伺服控制技术有限公司 | A kind of plunger pump swash plate valve plate component |
| CN110005586A (en) * | 2019-05-14 | 2019-07-12 | 辽宁工程技术大学 | A kind of cam-type axial piston pump that internal rotor permanent-magnetic synchronous motor directly drives |
| CN110067724A (en) * | 2019-03-13 | 2019-07-30 | 钟彪 | A kind of sliding plate supporting type axis plunger pump or motor |
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2020
- 2020-09-29 CN CN202011047508.9A patent/CN112177875B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10300070A1 (en) * | 2002-11-15 | 2004-06-03 | Brueninghaus Hydromatik Gmbh | Axial piston machine, retraction plate and method for producing a retraction plate |
| JP2018155193A (en) * | 2017-03-17 | 2018-10-04 | 日立建機株式会社 | Liquid pressure rotation machine |
| CN109236598A (en) * | 2018-11-08 | 2019-01-18 | 四川航天烽火伺服控制技术有限公司 | A kind of plunger pump swash plate valve plate component |
| CN110067724A (en) * | 2019-03-13 | 2019-07-30 | 钟彪 | A kind of sliding plate supporting type axis plunger pump or motor |
| CN110005586A (en) * | 2019-05-14 | 2019-07-12 | 辽宁工程技术大学 | A kind of cam-type axial piston pump that internal rotor permanent-magnetic synchronous motor directly drives |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115234462A (en) * | 2022-07-29 | 2022-10-25 | 杭州力龙液压有限公司 | Cylinder body structure, hydraulic power mechanism and engineering machinery |
| CN115234462B (en) * | 2022-07-29 | 2024-01-30 | 杭州力龙液压有限公司 | Cylinder body structure, hydraulic power mechanism and engineering machinery |
| CN115507011A (en) * | 2022-09-13 | 2022-12-23 | 厦门大学 | Plunger machine swash plate two-dimensional shimmy suppression device with double springs, mass and liquid resistance |
| CN115507011B (en) * | 2022-09-13 | 2024-04-30 | 厦门大学 | Two-dimensional shimmy suppression device with double springs, mass and liquid resistance for swash plate of plunger machine |
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| Publication number | Publication date |
|---|---|
| CN112177875B (en) | 2022-03-18 |
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