CN213744225U - Power controller of hydraulic pump - Google Patents
Power controller of hydraulic pump Download PDFInfo
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- CN213744225U CN213744225U CN202022210338.3U CN202022210338U CN213744225U CN 213744225 U CN213744225 U CN 213744225U CN 202022210338 U CN202022210338 U CN 202022210338U CN 213744225 U CN213744225 U CN 213744225U
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Abstract
The utility model relates to a hydraulic pump discharge capacity control technical field discloses a hydraulic pump power controller, including hydraulic pump, power valves, servo cylinder and oil tank, wherein, the power valves includes power spring assembly, and by outer valve body, power valve barrel and the power case of establishing to interior cover in proper order, servo cylinder's piston rod links to each other with the sloping cam plate, and power valve barrel links to each other with the sloping cam plate. The utility model provides a hydraulic pump power controller directly links to each other swash plate and power valve barrel, and the swash plate rotates and indicates the discharge capacity of hydraulic pump and changes, and the swash plate can change the discharge capacity of hydraulic pump and directly feed back to the power valve barrel, makes the power valve barrel follow the power case and remove in order to reach dynamic balance, realizes the balanced regulation of hydraulic pump discharge capacity feedback, compares the piston through servo cylinder and removes the discharge capacity change of feedback hydraulic pump, has improved the sensitivity of control accuracy and hydraulic pump discharge capacity feedback regulation.
Description
Technical Field
The utility model relates to a hydraulic pump discharge capacity control technical field especially relates to a hydraulic pump power controller.
Background
As shown in fig. 1, in the power controller of the hydraulic pump, a displacement feedback rod 4 'connected to a power valve sleeve of a power control valve 1' is directly connected to a servo piston 2 ', and when a load pressure changes, a spool of the power control valve 1' moves to supply oil to a rodless cavity of a servo cylinder through the hydraulic pump 3 ', so that the servo piston 2' of the servo cylinder moves, a swash plate is driven to rotate by the movement of the servo piston 2 ', and the displacement of the hydraulic pump 3' is adjusted; and the power valve sleeve is driven to move by the movement of the servo piston 2', so that the power valve sleeve and the valve core are kept balanced, and the feedback balance adjustment of the discharge capacity of the hydraulic pump is realized.
According to the scheme, the servo piston 2 ' is used as an intermediary to indirectly feed back the displacement change of the hydraulic pump 3 ', and an assembly gap is inevitably formed between two structural parts which move relatively on an assembly structure of the hydraulic pump 3 ', so that a displacement signal fed back by the swash plate is large, the control precision is low, and the response is slow.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hydraulic pump power controller can realize the direct feedback that the hydraulic pump discharge capacity changes, improves response speed and control accuracy.
To achieve the purpose, the utility model adopts the following technical proposal:
a power controller of a hydraulic pump comprises a hydraulic pump, a power valve group, a servo oil cylinder and an oil tank, wherein a return spring is used for providing acting force for enabling a swash plate of the hydraulic pump to rotate towards a displacement reducing direction; a piston rod of the servo oil cylinder is connected with a swash plate of the hydraulic pump to drive the swash plate to rotate, and the power valve group comprises a power spring group, a valve body, a power valve sleeve and a power valve core which are sequentially sleeved from outside to inside;
the power valve core is connected with the power valve sleeve in a sliding and sealing mode and is enclosed to form a high-pressure oil cavity communicated with an oil outlet of the hydraulic pump and a low-pressure oil cavity communicated with the oil tank; the power valve core can axially move relative to the power valve sleeve under the combined action of acting force provided by working oil in the high-pressure oil cavity and reset force provided by the power spring group, so that a servo working oil cavity of the servo oil cylinder is selectively communicated with the high-pressure oil cavity or the low-pressure oil cavity;
the power valve sleeve is connected with the swash plate, and the swash plate can drive the power valve sleeve to move relative to the valve body along the moving direction of the power valve core, so that the power valve sleeve and the power valve core are relatively fixed, and the servo working oil cavity is disconnected from the high-pressure oil cavity and the low-pressure oil cavity.
As a preferable technical solution of the above hydraulic pump power controller, the power valve set further includes a pressure regulating valve, the power spring is assembled at one end of the power valve core, and pressure provided by working oil output from the pressure regulating valve can act on the other end of the power valve core.
As a preferred technical solution of the above hydraulic pump power controller, the power valve set further includes a power regulating valve core, the power regulating valve core is disposed at one end of the power valve core opposite to the power spring set, and the pressure provided by the working oil output by the pressure regulating valve acts on the power valve core through the power regulating valve core.
As a preferred technical solution of the above hydraulic pump power controller, the power valve group further includes a spring seat slidably disposed in the valve body and disposed on one side of the power valve core;
the power spring group comprises a first spring and a second spring, the first spring is clamped between one side of the spring seat, which is back to the power valve core, and the inner wall of the valve body, the second spring is arranged on one side of the spring seat, which is back to the power valve core, and the spring seat is selectively pressed on one end of the second spring or the second spring.
As a preferable technical solution of the power controller of the hydraulic pump, the power controller further includes a power adjustment assembly, one end of the second spring, which is opposite to the spring seat, is connected to the power adjustment assembly, and the power adjustment assembly is axially movable relative to the valve body to adjust a distance between the second spring and the spring seat or a compression amount of the power spring group.
As a preferred technical solution of the above hydraulic pump power controller, the power adjusting assembly includes a push rod and an adjusting stud, the push rod, the adjusting stud and the second spring are sequentially arranged opposite to each other, and the second spring is clamped between the push rod and the spring seat;
the push rod is arranged in the valve body in a sliding mode, and one end of the adjusting stud extends into the valve body and is in threaded connection with the valve body.
As an optimal technical scheme of the power controller of the hydraulic pump, a spring installation cavity is defined between the spring seat and the inner wall of the valve body and between the spring seat and the power adjusting assembly, the power spring is assembled in the spring installation cavity, and the low-pressure oil cavity is communicated with the oil tank through the spring installation cavity.
As a preferred technical solution of the above hydraulic pump power controller, the power valve sleeve is provided with a servo oil port communicated with the servo working oil cavity, the outer wall of the power valve core is provided with a first high-pressure annular oil groove, and the outer walls of the power valve core at two ends of the first high-pressure annular oil groove and the inner wall of the power valve sleeve are in sliding sealing fit to enclose the high-pressure oil cavity;
first high pressure annular oil groove has relative first internal perisporium and the second internal perisporium that sets up, the area of first internal perisporium is greater than the area of second internal perisporium, first internal perisporium with servo oil port locates same one side of second internal perisporium.
As a preferred technical solution of the above hydraulic pump power controller, the hydraulic pump power controller further includes a reset cylinder, a piston rod of the reset cylinder and a piston rod of the servo cylinder are respectively rotatably connected to two opposite ends of the swash plate, a reset working oil chamber of the reset cylinder is provided with a reset spring and is communicated with an oil outlet of the hydraulic pump, the reset spring is used for providing an acting force for rotating the swash plate in a first direction, the piston rod of the servo cylinder is used for providing an acting force for rotating the swash plate in a second direction, and the first direction is opposite to the second direction;
the contact area of the piston of the reset oil cylinder and the working oil in the reset working oil cavity is smaller than that of the piston of the servo oil cylinder and the working oil in the servo working oil cavity.
As a preferable technical solution of the power controller of the above hydraulic pump, the power controller further includes a feedback rod, the power valve housing is provided with a mounting hole, one end of the feedback rod is connected to the swash plate, and the other end of the feedback rod is inserted into the mounting hole, can rotate relative to the power valve housing, and can push the power valve housing to move axially.
The utility model has the advantages that: the utility model provides a hydraulic pump power controller directly links to each other swash plate and power valve barrel, and the swash plate rotates and indicates the discharge capacity of hydraulic pump and changes, and the swash plate can change the discharge capacity of hydraulic pump and directly feed back to the power valve barrel, makes the power valve barrel follow the power case and remove in order to reach dynamic balance, realizes the balanced regulation of hydraulic pump discharge capacity feedback, compares the piston through servo cylinder and removes the discharge capacity change of feedback hydraulic pump, has improved the sensitivity of control accuracy and hydraulic pump discharge capacity feedback regulation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a hydraulic schematic of a prior art hydraulic pump power control;
fig. 2 is a hydraulic schematic diagram of a hydraulic pump power controller according to an embodiment of the present invention;
fig. 3 is a schematic view of a partial structure of a power valve assembly according to an embodiment of the present invention;
fig. 4 is a schematic partial structural diagram of a hydraulic pump power controller according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a partial structure of a power valve assembly according to an embodiment of the present invention;
fig. 6 is a diagram of a position relationship between a power valve set and a power valve sleeve according to an embodiment of the present invention.
In the figure:
1', a power control valve; 2', a servo piston; 3', a hydraulic pump; 4', a feedback rod;
1. a hydraulic pump; 11. a swash plate;
2. a power valve bank; 20. a valve body; 21. a power valve housing; 211. a servo oil port; 212. mounting holes; 22. a power valve core; 23. a feedback lever; 24. a power regulating valve core; 25. a spring seat; 261. a first spring; 262. a second spring; 271. a push rod; 272. adjusting the stud; 281. a spring mounting cavity; 282. a low pressure oil chamber; 283. a high pressure oil chamber; 29. a pressure regulating valve;
3. a servo cylinder; 4. a load sensitive valve; 5. a flow regulating valve; 6. a pressure shut-off valve; 7. resetting the oil cylinder; 8. a return spring.
Detailed Description
In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.
As shown in fig. 2 to 6, the present embodiment provides a hydraulic pump power controller, which includes a hydraulic pump 1, a power valve set 2, a servo cylinder 3 and an oil tank; a piston rod of the servo oil cylinder 3 is connected with the swash plate 11 to drive the swash plate 11 to rotate, and the power valve group 2 comprises a power spring group, a valve body 20, a power valve sleeve 21 and a power valve core 22 which are sequentially sleeved from outside to inside; the power valve core 22 is connected with the power valve sleeve 21 in a sliding and sealing manner and is enclosed to form a high-pressure oil chamber 283 communicated with an oil outlet of the hydraulic pump 1 and a low-pressure oil chamber 282 communicated with an oil tank; the power spool 22 is axially movable relative to the power valve sleeve 21 under combined action of a force provided by oil pressure in the high-pressure oil chamber 283 and a return force provided by a power spring group to selectively communicate the servo working oil chamber of the servo cylinder 3 with the high-pressure oil chamber 283 or with the low-pressure oil chamber 282; the power valve housing 21 is connected to a swash plate 11 of the hydraulic pump 1, and the swash plate 11 can move the power valve housing 21 relative to the valve body 20 in a moving direction of the power spool 22, so that the power valve housing 21 and the power spool 22 are relatively fixed and the servo working oil chamber is disconnected from both the high-pressure oil chamber 283 and the low-pressure oil chamber 282.
When the load pressure changes, the oil pressure in the high-pressure oil chamber 283 changes, the power spool 22 moves relative to the power valve sleeve 21 in the direction close to or away from the power spring group under the combined action of the pressure provided by the oil pressure in the high-pressure oil chamber 283 and the return force provided by the power spring group, so that the servo working oil chamber is communicated with the high-pressure oil chamber 283 or the low-pressure oil chamber 282, and the piston rod of the servo oil cylinder 3 moves to drive the swash plate 11 to rotate, thereby realizing the displacement adjustment of the hydraulic pump 1. The rotation of the swash plate 11 drives the power valve sleeve 21 to move relative to the valve body 20 along the moving direction of the power spool 22, so that the power valve sleeve 21 and the power spool 22 are relatively fixed, the servo working oil chamber is disconnected from the high-pressure oil chamber 283 and the low-pressure oil chamber 282, the power spool 22 and the power valve sleeve 21 reach dynamic balance, and the balance adjustment of the displacement feedback of the hydraulic pump 1 is realized.
The hydraulic pump power controller that this embodiment provided, with swash plate 11 and power valve barrel 21 direct link to each other, swash plate 11 rotates and shows the discharge capacity change of hydraulic pump 1, swash plate 11 can directly feed back the discharge capacity change of hydraulic pump 1 to power valve barrel 21, make power valve barrel 21 follow power valve core 22 and remove in order to reach dynamic balance, realize the balanced regulation of hydraulic pump 1 discharge capacity feedback, compare the piston through servo cylinder 3 and remove the discharge capacity change of feedback hydraulic pump 1, the sensitivity of control accuracy and hydraulic pump 1 discharge capacity feedback regulation has been improved.
Further, the hydraulic pump power controller further includes a feedback rod 23, the power valve housing 21 is provided with a mounting hole 212, one end of the feedback rod 23 is connected to the swash plate 11, and the other end of the feedback rod 23 is inserted into the mounting hole 212 and can rotate relative to the power valve housing 21 and can push the power valve housing 21 to move axially. The installation hole 212 prevents the power valve sleeve 21 and the feedback rod 23 from being locked due to relative rotation. In this embodiment, the feedback rod 23 is connected to the swash plate 11 by a screw, the mounting hole 212 is a waist-shaped through hole, the long axis direction of the waist-shaped through hole is the radial direction of the power valve sleeve 21, and one end of the feedback rod 23 extending into the waist-shaped through hole is spaced from the power valve core 22. In other embodiments, the mounting hole 212 may be a kidney-shaped counterbore.
Further, the power valve assembly 2 further includes a pressure regulating valve 29, the power spring is assembled at one end of the power valve core 22, and the pressure provided by the working oil output from the pressure regulating valve 29 can act on the other end of the power valve core 22.
Specifically, the power valve assembly 2 further includes a power regulating valve core 24, the power regulating valve core 24 is disposed at an end of the power valve core 22 opposite to the power spring assembly, and the pressure provided by the working oil output from the pressure regulating valve 29 acts on the power valve core 22 through the power regulating valve core 24. In this embodiment, the pressure regulating valve 29 is an electric proportional pressure regulating valve or a hydraulic proportional control valve.
The pressure regulating valve 29 is regulated according to the power demand of an engine on the engineering vehicle, the oil pressure of the working oil output by the pressure regulating valve 29 is changed, the power regulating valve core 24 moves axially, the power valve core 22 moves axially along with the power regulating valve core 24, the compression amount of the power spring group is changed, and the automatic regulation of the power of the hydraulic pump 1 is realized.
Further, the power valve group 2 further includes a spring seat 25, the spring seat 25 is slidably disposed in the valve body 20 and is disposed on a side of the power valve spool 22 facing away from the power regulating valve spool 24, the power spring group includes a first spring 261 and a second spring 262, and the first spring 261 is clamped between a side of the spring seat 25 facing away from the power valve spool 22 and an inner wall of the valve body 20; the second spring 262 is disposed on a side of the spring seat 25 facing away from the power regulating spool 22, and the spring seat 25 is selectively pressed against an end of the second spring 262 or separated from the second spring 262. In this embodiment, the elastic coefficient of the first spring 261 is larger than that of the second spring 262.
When the hydraulic pressure of the hydraulic oil output from the pressure regulating valve 29 is adjusted, the hydraulic pressure of the hydraulic oil output from the pressure regulating valve 29 is increased, for example. In the initial state, the spring seat 25 is separated from the second spring 262, and when the oil pressure of the hydraulic oil output from the pressure regulating valve 29 increases, the power regulating spool 24 pushes the power spool 22 to move leftward, the spring seat 25 presses the first spring 261 to increase the compression amount of the first spring 261, and after the power spool 22 moves a certain distance, the spring seat 25 contacts the second spring 262, and the first spring 261 and the second spring 262 are compressed at the same time as the spring seat 25 continues to move to the side where the second spring 262 is located, thereby realizing the double-fold power regulation of the hydraulic pump.
Further, the power valve assembly further comprises a power adjusting assembly, wherein one end of the second spring 262, which is opposite to the spring seat 25, is connected to the power adjusting assembly, and the power adjusting assembly can axially move relative to the valve body 20 to adjust the compression amount of the power spring assembly.
Specifically, the power adjusting assembly comprises a push rod 271 and an adjusting stud 272, and the push rod 271, the adjusting stud 272 and the second spring 262 are arranged oppositely in sequence; the push rod 271 is slidably disposed in the valve body 20, and one end of the adjusting stud 272 extends into the valve body 20 and is threadedly connected with the valve body 20.
The distance between the second spring 262 and the spring seat 25 can be adjusted by manually screwing the adjusting stud 272, the distance between the second spring 262 and the spring seat 25 is different, and the oil pressure in the high-pressure oil chamber when the second spring 262 starts to contact with the spring seat 25 is different. After the second spring 262 contacts the spring seat 25, the compression amounts of the first spring 261 and the second spring 262 can be adjusted by manually screwing the adjustment stud 272, and manual adjustment of the power of the hydraulic pump 1 is achieved.
Further, repeated deformation of the first spring 261 and the second spring 262 may cause a temperature increase in the spring installation chamber 281, so as to affect the sensitivity of the power spool 22 to sense a change in the oil pressure of the working oil output from the pressure regulator valve 29 and a change in the oil pressure in the high-pressure oil chamber 283. For this purpose, in the present embodiment, a spring installation cavity 281 is defined between the spring seat 25 and the inner wall of the valve body 20 and between the power adjusting assembly, the power spring assembly is disposed in the spring installation cavity 281, and the low-pressure oil chamber 282 is communicated with the oil tank through the spring installation cavity 281. The power spool 22 reciprocates axially to allow low pressure oil to repeatedly enter and exit the spring mounting chamber 281 and the low pressure oil chamber 282 to cool the first spring 261 and the second spring 262.
Further, a second high-pressure annular oil groove is formed in the outer wall of the power valve sleeve 21, a first high-pressure oil port is formed in the outer wall of the valve body 20, the outer walls of the power valve sleeves 21 at the two ends of the second high-pressure annular oil groove are in sliding sealing fit with the inner wall of the valve body 20 to form a high-pressure cavity, a second high-pressure oil port is formed in the bottom wall of the second high-pressure annular oil groove, and the oil outlet of the hydraulic pump 1 is communicated with the high-pressure cavity through the first high-pressure oil port; the outer wall of the power valve core 22 is provided with a first high-pressure annular oil groove, the outer walls of the power valve core 22 at two ends of the first high-pressure annular oil groove and the inner wall of the power valve sleeve 21 are in sliding sealing fit to define a high-pressure oil cavity 283, and the high-pressure oil cavity is communicated with the high-pressure oil cavity 283 through a second high-pressure oil hole, so that the oil outlet of the hydraulic pump 1 is communicated with the high-pressure oil cavity 283.
The outer wall of the power valve sleeve 21 is provided with a servo annular oil groove, the outer walls of the power valve sleeve 21 at two ends of the servo annular oil groove are in sliding fit with the inner wall of the valve body 20 to form a servo oil cavity, the outer wall of the valve body 20 is provided with a servo communicating oil port, the servo working oil cavity is communicated with the servo oil cavity through the servo communicating oil port, the bottom wall of the servo annular oil groove is provided with a servo oil port 211, and in the axial movement process of the power valve core 22, the servo oil port 211 can be selectively communicated with the low-pressure oil cavity 282 or the high-pressure oil cavity 283, so that the servo working oil cavity is selectively communicated with the low-pressure oil cavity 282 or the high-pressure oil cavity 283. In this embodiment, the servo working oil chamber refers to a rodless chamber of a servo cylinder.
The first high-pressure annular oil groove is provided with a first inner circumferential wall and a second inner circumferential wall which are oppositely arranged, the area of the first inner circumferential wall is larger than that of the second inner circumferential wall, and the first inner circumferential wall and the servo oil port 211 are arranged on the same side of the second inner circumferential wall. With the above arrangement, there is an area difference between the first inner peripheral wall and the second inner peripheral wall, and when the oil pressure in the high-pressure oil chamber 283 increases, the acting force of the working oil in the high-pressure oil chamber 283 acting on the first inner peripheral wall is greater than the acting force acting on the second inner peripheral wall, so that the power valve core 22 moves to the side of the servo oil port 211, and the high-pressure oil chamber 283 is communicated with the servo oil port 211.
Specifically, the power valve sleeve 21 is provided with a through hole for passing through the power valve core 22, the through hole is a stepped hole, the first inner circumferential wall is just opposite to a large-diameter hole of the stepped hole, and the second inner circumferential wall is just opposite to a small-diameter hole of the stepped hole, so that the area of the first inner circumferential wall is larger than that of the second inner circumferential wall.
The power controller of the hydraulic pump further comprises a reset oil cylinder 7, a piston rod of the reset oil cylinder 7 and a piston rod of the servo oil cylinder 3 are respectively connected to two opposite ends of the swash plate 11, the piston rod of the reset oil cylinder 7 is rotatably connected with the swash plate 11, a reset spring 8 is arranged in a reset working oil cavity of the reset oil cylinder 7 and communicated with an oil outlet of the hydraulic pump 1, the reset spring 8 is used for providing an acting force for enabling the swash plate 11 to rotate along a first direction, the piston rod of the servo oil cylinder 3 is used for providing an acting force for enabling the swash plate 11 to rotate along a second direction, and the first direction is opposite to the second direction. In this embodiment, the above-described return working oil chamber refers to a rodless chamber of the return cylinder 7.
The contact area of the piston of the reset oil cylinder 7 and the working oil in the reset working oil cavity of the reset oil cylinder 7 is smaller than the contact area of the piston of the servo oil cylinder 3 and the working oil in the servo working oil cavity. When the servo working oil chamber communicates with the high-pressure oil chamber 283, the piston rod of the reset cylinder 3 rotates the swash plate 11 to adjust the displacement of the hydraulic pump 1, and at this time, the reset spring 8 is compressed. When the servo working oil chamber communicates with the low-pressure oil chamber 282, the return force provided by the return spring 8 can push the piston rod of the return cylinder 7 to move, so that the swash plate 11 is rotated to adjust the displacement of the hydraulic pump 1.
Further, the hydraulic pump power controller further comprises a load sensitive valve 4 and a flow regulating valve 5, wherein the load sensitive valve 4 is a two-position three-way reversing valve, and the load pressure change is fed back to a pilot oil port of the load sensitive valve 4 through the flow regulating valve 5 so as to regulate the state of the load sensitive valve 4, and the displacement of the hydraulic pump 1 is regulated according to the load pressure change to meet the load requirement.
Further, the hydraulic pump power controller further comprises a pressure cut-off valve 6, the pressure cut-off valve 6 is a two-position three-way reversing valve, the pressure cut-off valve 6 is located on the left side, the hydraulic pump power controller normally works, and when the pressure cut-off valve 6 is located on the right side, the hydraulic pump power controller stops working. When the outlet oil pressure of the hydraulic pump 1 is excessive, the pressure cut-off valve 6 is switched to the right position to protect the hydraulic pump power controller.
It should be noted that the load sensitive valve 4, the flow rate regulating valve 5, and the pressure cutoff valve 6 are provided in the hydraulic pump power controller in the prior art, and will not be described in detail here.
The constant power regulation process of the hydraulic pump power controller is as follows: when the load pressure is increased, the oil pressure in the high-pressure oil cavity 283 is increased to push the power valve core 22 to move axially, so that the power spring assembly is compressed, the high-pressure oil cavity 283 is communicated with the servo working oil cavity through the servo oil port 211, the piston of the servo oil cylinder 3 extends to drive the swash plate 11 to rotate so as to reduce the displacement of the hydraulic pump 1, and the swash plate 11 rotates to drive the power valve sleeve 21 to move along with the power valve core 22 in the same direction, so that the power valve sleeve 21 and the power valve core 22 reach dynamic balance.
When the load pressure is reduced, the oil pressure in the high-pressure oil chamber 283 is reduced, the reset force provided by the power spring group pushes the power valve core 22 to move axially, so that the low-pressure oil chamber 282 is communicated with the servo working oil chamber through the servo oil port 211, the oil pressure in the servo working oil chamber is reduced, the reset force provided by the reset spring 8 enables the swash plate 11 to rotate so as to increase the displacement of the hydraulic pump 1, and the rotation of the swash plate 11 can drive the power valve sleeve 21 to move along with the power valve core 22 in the same direction, so that the power valve sleeve 21 and the power valve core 22 reach dynamic balance.
The variable power control method of the hydraulic pump power controller is two types, one of which is automatic control, specifically, the pressure control valve 29 is adjusted to change the acting force of the output oil pressure acting on the power valve core 22, and correspondingly, the compression amount of the power spring set will be changed, so as to realize the automatic control of the power of the hydraulic pump 1. The other is manual adjustment, and the adjusting stud 272 is manually screwed to change the acting force of the push rod 271 on the second spring 262, so as to adjust the compression amount of the power spring set, and realize the manual adjustment of the power of the hydraulic pump 1.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (10)
1. A power controller of a hydraulic pump comprises a hydraulic pump (1), a power valve group (2) and a servo oil cylinder (3); the hydraulic power control system is characterized in that a piston rod of the servo oil cylinder (3) is connected with a swash plate (11) of the hydraulic pump (1) to drive the swash plate (11) to rotate, and the power valve group (2) comprises a power spring group, a valve body (20), a power valve sleeve (21) and a power valve core (22) which are sequentially sleeved from outside to inside;
the power valve core (22) is connected with the power valve sleeve (21) in a sliding and sealing mode and is surrounded with a high-pressure oil cavity (283) communicated with an oil outlet of the hydraulic pump (1) and a low-pressure oil cavity (282) communicated with an oil tank; the power valve core (22) can move axially relative to the power valve sleeve (21) under the combined action of the acting force provided by the working oil in the high-pressure oil cavity (283) and the reset force provided by the power spring set, so that the servo working oil cavity of the servo oil cylinder (3) is selectively communicated with the high-pressure oil cavity (283) or the low-pressure oil cavity (282);
the power valve sleeve (21) is connected with the swash plate (11), and the swash plate (11) can drive the power valve sleeve (21) to move relative to the valve body (20) along the moving direction of the power valve core (22), so that the power valve sleeve (21) and the power valve core (22) are relatively fixed, and the servo working oil cavity is disconnected from the high-pressure oil cavity (283) and the low-pressure oil cavity (282).
2. The hydraulic pump power controller according to claim 1, wherein the power valve block (2) further comprises a pressure regulating valve (29), the power spring is assembled at one end of the power valve spool (22), and the pressure provided by the working oil output from the pressure regulating valve (29) can act on the other end of the power valve spool (22).
3. The hydraulic pump power controller according to claim 2, characterized in that the power valve group (2) further comprises a power regulating valve core (24), the power regulating valve core (24) is arranged at one end of the power valve core (22) opposite to the power spring group, and the pressure provided by the working oil output by the pressure regulating valve (29) acts on the power valve core (22) through the power regulating valve core (24).
4. A hydraulic pump power controller according to claim 3, characterized in that the power valve block (2) further comprises a spring seat (25) slidably arranged in the valve body (20) and arranged on a side of the power spool (22) facing away from the power regulating spool (24);
the power spring group comprises a first spring (261) and a second spring (262), the first spring (261) is clamped between one side, facing away from the power valve core (22), of the spring seat (25) and the inner wall of the valve body (20), the second spring (262) is arranged on one side, facing away from the power valve core (22), of the spring seat (25), and the spring seat (25) is selectively pressed to one end of the second spring (262) or separated from the second spring (262).
5. A hydraulic pump power control as claimed in claim 4, characterized by further comprising a power regulating assembly to which the end of the second spring (262) facing away from the spring seat (25) is connected, the power regulating assembly being axially movable relative to the valve body (20) to adjust the distance between the second spring (262) and the spring seat (25) or the compression of the power spring pack.
6. The hydraulic pump power controller of claim 5, characterized in that the power adjusting assembly comprises a push rod (271) and an adjusting stud (272), and the push rod (271), the adjusting stud (272) and the second spring (262) are arranged opposite to each other in sequence;
the push rod (271) is arranged in the valve body (20) in a sliding mode, and one end of the adjusting stud (272) extends into the valve body (20) and is in threaded connection with the valve body (20).
7. The hydraulic pump power controller as claimed in claim 5, wherein a spring mounting chamber (281) is defined between the spring seat (25) and the inner wall of the valve body (20) and the power adjusting assembly, the power spring is disposed in the spring mounting chamber (281), and the low pressure oil chamber (282) communicates with the oil tank through the spring mounting chamber (281).
8. The hydraulic pump power controller according to any one of claims 2 to 7, characterized in that a servo oil port (211) communicated with the servo working oil chamber is formed in the power valve sleeve (21), a first high-pressure annular oil groove is formed in the outer wall of the power valve core (22), and the outer wall of the power valve core (22) at two ends of the first high-pressure annular oil groove and the inner wall of the power valve sleeve (21) are in sliding sealing fit to enclose the high-pressure oil chamber (283);
first high pressure annular oil groove has relative first internal perisporium and the second internal perisporium that sets up, the area of first internal perisporium is greater than the area of second internal perisporium, first internal perisporium with servo oil port (211) are located same one side of second internal perisporium.
9. The hydraulic pump power controller according to any one of claims 2 to 7, characterized by further comprising a reset cylinder (7), wherein a piston rod of the reset cylinder (7) and a piston rod of the servo cylinder (3) are respectively and rotatably connected to two opposite ends of the swash plate (11), a reset spring (8) is arranged in a reset working oil chamber of the reset cylinder (7) and is communicated with an oil outlet of the hydraulic pump (1), the reset spring (8) is used for providing acting force for rotating the swash plate (11) along a first direction, a piston rod of the servo cylinder (3) is used for providing acting force for rotating the swash plate (11) along a second direction, and the first direction and the second direction are opposite;
the contact area of the piston of the reset oil cylinder (7) and the working oil in the reset working oil cavity is smaller than that of the piston of the servo oil cylinder (3) and the working oil in the servo working oil cavity.
10. The hydraulic pump power controller according to any one of claims 1 to 7, characterized by further comprising a feedback rod (23), wherein the power valve sleeve (21) is provided with a mounting hole (212), one end of the feedback rod (23) is connected with the swash plate (11), and the other end thereof is inserted into the mounting hole (212) and can rotate relative to the power valve sleeve (21) and can push the power valve sleeve (21) to move axially.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022210338.3U CN213744225U (en) | 2020-09-30 | 2020-09-30 | Power controller of hydraulic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022210338.3U CN213744225U (en) | 2020-09-30 | 2020-09-30 | Power controller of hydraulic pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213744225U true CN213744225U (en) | 2021-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022210338.3U Active CN213744225U (en) | 2020-09-30 | 2020-09-30 | Power controller of hydraulic pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213744225U (en) |
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2020
- 2020-09-30 CN CN202022210338.3U patent/CN213744225U/en active Active
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