CN107387350B - Plunger assembly for oblique plunger motor and oblique plunger motor - Google Patents
Plunger assembly for oblique plunger motor and oblique plunger motor Download PDFInfo
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- CN107387350B CN107387350B CN201710781401.9A CN201710781401A CN107387350B CN 107387350 B CN107387350 B CN 107387350B CN 201710781401 A CN201710781401 A CN 201710781401A CN 107387350 B CN107387350 B CN 107387350B
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- pressure relief
- plunger
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- relief groove
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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
- F04B1/20—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 rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2078—Swash plates
- F04B1/2085—Bearings for swash plates or driving axles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Motors (AREA)
Abstract
The invention relates to the technical field of hydraulic pressure, in particular to a plunger assembly for an inclined plunger motor and the inclined plunger motor. The plunger assembly includes: a plunger and a spindle; the plunger comprises a ball head and a plunger rod; a ball socket is arranged on the main shaft; the ball head is rotationally arranged in the ball socket; the top of the ball head is provided with a static pressure groove; the ball head or the ball socket is provided with a pressure relief groove; one end of the pressure relief groove is communicated with the static pressure groove, and the other end of the pressure relief groove is communicated with the motor inner shell. Hydraulic oil enters the static pressure groove on the surface of the ball head through the passage in the plunger rod and the passage in the ball head, then flows into the pressure relief groove, and finally flows out of the pressure relief groove into the motor shell to complete pressure relief. Therefore, the ball head can be set to be of a single diameter, namely, the diameter of the ball head is uniquely determined, and the diameter of a circle where the surface of the ball head is located is the same and is not variable, so that the processing is convenient.
Description
Technical Field
The invention relates to the technical field of hydraulic pressure, in particular to a plunger assembly for an inclined plunger motor and the inclined plunger motor.
Background
The hydraulic motor is an actuator of the hydraulic system, which converts the hydraulic pressure energy provided by the hydraulic pump into mechanical energy (torque and rotational speed) of its output shaft. Liquids are media that transmit forces and motions. The hydraulic motor is mainly applied to injection molding machinery, ships, lifting machines, engineering machinery, construction machinery, coal mine machinery, mining machinery, metallurgical machinery, ship machinery, petrochemical industry, port machinery and the like.
The hydraulic motor is classified into gear type, vane type, plunger type and other types according to its structural type. The working principle of the axial plunger motor is that an oil distribution disc and a main shaft are fixed, and a motor shaft is connected with a cylinder body to rotate together. When pressure oil enters a plunger hole of a cylinder body through a window of an oil distribution disc, a plunger extends outwards under the action of the pressure oil and is tightly attached to a main shaft, the main shaft generates a normal counter force p to the plunger, and the force can be decomposed into an axial component and a vertical component Q. Q is balanced with the hydraulic pressure on the plunger, and Q enables the plunger to generate a torque to the center of the cylinder body to drive the motor shaft to rotate in the anticlockwise direction.
The plunger comprises a plunger rod and a ball head arranged at the head of the plunger rod, and a return disc is arranged at the edge of the ball socket so as to press the ball head in the ball socket and prevent the ball head from being removed from the ball socket. The main shaft is provided with a ball socket, and the ball head is rotatably arranged in the ball socket. Because the bulb is at the internal rotation of ball socket, both frictional forces are great, consequently, set up the helicla flute on the bulb, hydraulic oil flows out the bulb behind the passageway that plunger through-hole got into bulb inside to flow into the helicla flute on bulb surface, make to have hydraulic oil between bulb and the ball socket, thereby lubricate between bulb and the ball socket, play the static pressure supporting role simultaneously. If hydraulic oil is led between the ball head and the ball socket in a straight direction, the pressure on the ball head is overlarge, and the ball head needs to be unloaded in time. In the related art, a leakage chamber is provided on the ball head, and the ball head is set to be variable in diameter, that is, the diameter of the ball head between the leakage chamber and the equatorial plane is gradually reduced so that a gap is formed between the ball head and the ball socket, and then a spiral-shaped pressure relief groove, which communicates with the gap, is provided on the inner wall of the return disc. That is, the hydraulic oil between the ball head and the ball socket flows into the leakage cavity, flows out of the leakage cavity, flows into the pressure relief groove through the gap, and flows out of the pressure relief groove into the motor shell cavity, so that the pressure unloading of the ball head is realized.
However, in the related art, the pressure unloading of the plunger ball head is realized by forming the ball head by hemispheres with large and small diameters, so that the processing is inconvenient.
Disclosure of Invention
The invention aims to provide a plunger assembly for an inclined shaft type plunger motor and a hydraulic motor, and aims to solve the technical problem that in the prior art, the pressure unloading of a plunger ball head is realized by forming the ball head by a hemisphere with a large diameter and a hemisphere with a small diameter, so that the processing is inconvenient.
The present invention provides a plunger assembly for a bent axis plunger motor, comprising: a plunger and a spindle;
the plunger comprises a ball head and a plunger rod; a ball socket is arranged on the main shaft; the ball head is rotatably arranged in the ball socket; the top of the ball head is provided with a static pressure groove;
the ball head or the ball socket is provided with a pressure relief groove; one end of the pressure relief groove is communicated with the static pressure groove, and the other end of the pressure relief groove is communicated with the motor inner shell.
Further, the pressure relief groove is arranged on the outer wall of the ball head; the pressure relief groove comprises a top pressure relief groove; one end of the top pressure relief groove is communicated with the static pressure groove, and the other end of the top pressure relief groove extends to the equator of the ball head.
Further, a return disc is arranged between the edge of the ball socket and the ball head;
the pressure relief groove also comprises a bottom pressure relief groove; one end of the bottom pressure relief groove is communicated with the top pressure relief groove, and the other end of the bottom pressure relief groove extends out of the joint of the return disc and the ball head.
Further, the pressure relief groove is linear.
Further, the pressure relief groove is spiral.
Further, the pressure relief grooves are multiple;
the pressure relief grooves are sequentially and uniformly arranged at intervals along the circumferential direction of the ball socket.
Further, the pressure relief groove is arranged on the inner wall of the ball socket and is positioned between the static pressure groove and the equator of the ball head;
a return disc is arranged between the edge of the ball socket and the ball head; and the return disc is provided with a pressure relief channel communicated with the pressure relief groove.
Further, the static pressure groove is annular.
Further, the static pressure grooves are multiple; the plurality of static pressure grooves are sequentially arranged on the outer wall of the ball head at intervals along the length direction of the plunger rod.
Further, the invention also provides a diagonal plunger motor which comprises the plunger assembly for the diagonal plunger motor.
The invention provides a plunger assembly for a bent axis type plunger motor, which comprises a plunger and a main shaft; the plunger comprises a ball head and a plunger rod, and the ball head or the ball socket is provided with a pressure relief groove. Hydraulic oil enters the static pressure groove on the surface of the ball head through the channel in the plunger rod and the channel in the ball head, then flows into the pressure relief groove, and finally flows out of the motor shell from the pressure relief groove to complete pressure relief. Thus, the ball head can be set to a single diameter, that is, the diameter of the ball head is uniquely determined, and the diameter of the circle on which the surface of the ball head is located is the same, not variable.
According to the plunger assembly of the hydraulic motor, the pressure relief is completed by arranging the pressure relief groove on the ball head or the ball socket, the diameter of the ball head is single and unchanged, and therefore the processing is convenient.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a plunger assembly for a bent-axis plunger motor according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a ball head in a plunger assembly for a bent-axis plunger motor according to an embodiment of the present invention;
fig. 3 is another schematic structural view of a ball head in a plunger assembly for a bent-axis plunger motor according to an embodiment of the invention.
In the figure:
1-a plunger; 2-a static pressure groove; 3-a leakage cavity;
4-a pressure relief groove; 5-a main shaft; 6-a return disc;
41-top pressure relief groove; 42-bottom pressure relief groove; 11-a plunger rod;
12-a ball head; 121-equator; 122-lower hemispherical head;
123-upper hemispherical head; 124-outer wall; 125-top.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the term "equator 121 of the ball head 12" refers to a plane along which the diameter of the ball head 12 is perpendicular to the length direction of the plunger rod 11 in the extension direction of the plunger rod 11. The equator 121 divides the ball head 12 into an upper hemispherical head 123 and a lower hemispherical head 122.
FIG. 1 is a schematic structural diagram of a plunger assembly for a bent-axis plunger motor according to an embodiment of the present invention; FIG. 2 is a schematic structural view of a ball head in a plunger assembly for a bent-axis plunger motor according to an embodiment of the invention; FIG. 3 is another schematic structural view of a ball head in a plunger assembly for a bent-axis plunger motor according to an embodiment of the present invention; as shown in fig. 1 to 3, an embodiment of the present invention provides a plunger 1 assembly for a bent-axis plunger 1 motor, the plunger assembly for the bent-axis plunger motor including: a plunger 1 and a main shaft 5; the plunger 1 comprises a ball head 12 and a plunger rod 11; a ball socket is arranged on the main shaft 5; the ball head 12 is rotatably arranged in the ball socket; the top 125 of the ball head 12 is provided with a static pressure groove 2; the ball head 12 or the ball socket is provided with a pressure relief groove 4; one end of the pressure relief groove 4 is communicated with the static pressure groove 2, and the other end of the pressure relief groove is communicated with the motor inner shell.
The plunger assembly for the inclined shaft type plunger motor provided by the embodiment of the invention comprises a plunger 1 and a main shaft 5; the plunger 1 comprises a ball 12 and a plunger rod 11, and the ball 12 or a ball socket is provided with a pressure relief groove 4. Hydraulic oil enters the static pressure groove 2 on the surface of the ball head 12 through a passage in the plunger rod 11 and a passage in the ball head 12, then flows into the pressure relief groove 4, and finally flows out of the pressure relief groove 4 into the motor shell to complete pressure relief. This allows the ball 12 to be provided with a single diameter, i.e., the diameter of the ball 12 is uniquely determined, and the diameter of the circle on which the surface of the ball 12 is located is the same, not variable.
According to the plunger 1 assembly of the hydraulic motor, pressure relief is completed by arranging the pressure relief groove 4 on the ball head 12 or the ball socket, the diameter of the ball head 12 is single and invariable, and therefore processing is facilitated.
Wherein, a leakage cavity 3 is arranged between the static pressure groove 2 and the equator of the ball head, and the leakage cavity 3 is communicated with the static pressure groove 2 through the matching clearance of the ball socket of the ball head 12. The pressure relief groove 4 communicates with the leakage chamber 3. After entering the static pressure groove 2, the hydraulic oil leaks into the leakage cavity 3 through a gap between the ball head 12 and the ball socket, then enters the pressure relief groove 4, and flows into the motor shell. The arrangement of the leakage cavity 3 can enable the hydraulic oil in the static pressure groove 2 to smoothly flow into the pressure relief groove 4, and the pressure relief effect is improved.
As shown in fig. 1 to fig. 3, in addition to the above embodiment, further, the pressure relief groove 4 is provided on the outer wall 124 of the bulb 12; the pressure relief groove 4 includes a top pressure relief groove 41; one end of the top pressure relief groove 41 communicates with the static pressure groove 2, and the other end extends to the equator 121 of the ball head 12.
In this embodiment, the pressure relief groove 4 is disposed on the outer wall 124 of the ball head 12, the pressure relief groove 4 includes a top pressure relief groove 41, one end of the top pressure relief groove 41 is communicated with the static pressure groove 2, and the other end extends to the equator 121 of the ball head 12. After entering the static pressure tank 2, the hydraulic oil flows into the top pressure relief tank 41, and flows into the motor housing from the top pressure relief tank 41.
Wherein, be provided with return stroke dish 6 between the border of ball socket and bulb 12, return stroke dish 6 compresses tightly bulb 12 in the ball socket. The return disc 6 is provided with an outflow slot communicating with the top pressure relief slot 41, which extends out of the connection between the return disc 6 and the ball 12, communicating with the motor inner housing. After entering the static pressure groove 2, the hydraulic oil flows into the outflow groove through the top pressure relief groove 41, and finally flows into the motor housing to complete pressure relief.
Among them, the shape of the top pressure relief groove 41 may be various, for example: linear, curvilinear, or other irregular shapes, etc.
As shown in fig. 1 to 3, in addition to the above embodiments, a return disc 6 is further arranged between the edge of the ball socket and the ball head 12; the pressure relief groove 4 further comprises a bottom pressure relief groove 42; one end of the bottom pressure relief groove 42 is communicated with the top pressure relief groove 41, and the other end extends out of the joint of the return disc 6 and the ball head 12.
In this embodiment, the pressure relief groove 4 further includes a bottom pressure relief groove 42, and the bottom pressure relief groove 42 extends out of the connection between the return disc 6 and the ball 12, so as to communicate with the motor inner housing. The hydraulic oil flows into the leakage cavity 3 after entering the static pressure groove 2, sequentially flows through the top pressure relief groove 41 and the bottom pressure relief groove 42, and finally flows into the motor inner shell from the bottom pressure relief groove 42.
In this embodiment, the bottom pressure relief groove 42 is provided on the outer wall 124 of the ball head 12, so that the hydraulic oil in the static pressure groove 2 directly flows into the motor housing through the top pressure relief groove 41 and the bottom pressure relief groove 42 via the leakage cavity 3, and thus the outflow channel can be prevented from being provided on the return disk 6, and the size of the outflow channel is prevented from being changed due to the difference of the extrusion degree of the return disk 6, and therefore, the hydraulic oil is ensured to flow into the motor housing rapidly in time, and the pressure relief effect is ensured.
As shown in fig. 1 to 3, in addition to the above-described embodiments, the pressure relief groove 4 is further linear.
In the embodiment, the pressure relief groove 4 is linear, that is, the top pressure relief groove 41 and the bottom pressure relief groove 42 are both linear, and the top pressure relief groove 41 and the bottom pressure relief groove 42 are located on the same straight line. The hydraulic oil in the static pressure groove 2 flows into the motor housing through the linear pressure relief groove 4.
In this embodiment, set up pressure relief groove 4 to the straight line form, simple structure, the processing of being convenient for can guarantee the machining precision simultaneously.
Wherein, the pressure relief groove 4 can also be spiral.
As shown in fig. 1 to 3, in addition to the above-described embodiments, there are a plurality of pressure relief grooves 4; the plurality of pressure relief grooves 4 are arranged in the circumferential direction of the ball socket at regular intervals in order.
In this embodiment, the plurality of pressure relief grooves 4 are provided, and the plurality of pressure relief grooves 4 are provided at regular intervals in order along the circumferential direction of the ball socket. The hydraulic oil in the static pressure groove 2 flows into the leakage cavity 3 and then is discharged to the motor shell through the pressure relief grooves 4, so that a channel for discharging the hydraulic oil is increased, the hydraulic oil is guaranteed to be discharged in time, and the pressure relief efficiency is improved.
As shown in fig. 1 to 3, on the basis of the above embodiment, further, a pressure relief groove 4 is provided on the inner wall of the ball socket and between the static pressure groove 2 and the equator 121 of the ball head 12; a return disc 6 is arranged between the edge of the ball socket and the ball head 12; the return disc 6 is provided with a pressure relief channel communicated with the pressure relief groove 4.
In this embodiment, the pressure relief groove 4 is disposed on the inner wall of the ball socket and between the static pressure groove 2 and the equator 121 of the ball head 12, and the return disk 6 is provided with a pressure relief channel. The hydraulic oil in the static pressure groove 2 enters the pressure relief groove 4 on the ball socket, then flows into the pressure relief channel on the return disc 6 from the pressure relief groove 4, and finally flows into the motor shell.
As shown in fig. 1 to 3, in the above embodiment, further, the diameter of the inner wall of the socket between the static pressure groove 2 and the equator 121 is larger than the diameter of the inner wall of the socket corresponding to the static pressure groove 2.
In the embodiment, the diameter of the inner wall of the ball socket is increased, so that a pressure relief cavity communicated with the static pressure groove 2 is formed between the ball socket and the ball head 12. After entering the pressure relief cavity, the hydraulic oil in the static pressure groove 2 finally flows into the motor shell through an oil drainage channel on the return disc 6.
As shown in fig. 1 to 3, in addition to the above-described embodiments, the static pressure groove 2 is further annular.
In this embodiment, set up hydrostatic tank 2 into the annular, its spiral among the prior art compares, and simple structure has reduced the processing degree of difficulty, the processing of being convenient for.
Preferably, the static pressure groove 2 is circular, and a connecting line between the circle of the static pressure groove 2 and the sphere center of the ball head 12 is parallel to the extending direction of the plunger rod 11.
As shown in fig. 1 to 3, in addition to the above-described embodiments, there are a plurality of static pressure grooves 2; the plurality of static pressure grooves 2 are sequentially arranged on the outer wall 124 of the ball head 12 at intervals along the length direction of the plunger rod 11.
In this embodiment, the plurality of static pressure grooves 2 are provided, and the plurality of static pressure grooves 2 are sequentially provided on the outer wall 124 of the ball head 12 at intervals along the length direction of the plunger rod 11. Along the direction from the top of the ball head 12 to the bottom of the ball, that is, the direction from the ball head 12 to the plunger rod 11, the hydraulic oil sequentially flows into the plurality of static pressure grooves 2, and the hydraulic oil in the static pressure grooves 2 at the bottom leaks into the leakage cavity 3 through the gap and finally enters the pressure relief groove 4.
In this embodiment, a plurality of static pressure grooves 2 are provided, so that sufficient hydraulic oil is available at the top 125 of the ball head 12 for lubrication and static pressure support, thereby improving the effect.
On the basis of the above embodiment, further, the embodiment of the present invention also provides a hydraulic motor, and the hydraulic motor includes the plunger 1 assembly for the oblique axis type plunger 1 motor according to the embodiment of the present invention.
In the hydraulic motor provided by the embodiment, the ball 12 or the ball socket is provided with the pressure relief groove 4. Hydraulic oil enters the static pressure groove 2 on the surface of the ball head 12 through a passage in the plunger rod 11 and a passage in the ball head 12, then flows into the pressure relief groove 4, and finally flows out of the pressure relief groove 4 into the motor shell to complete pressure relief. This allows the ball 12 to be provided with a single diameter, i.e., the diameter of the ball 12 is uniquely determined, and the diameter of the circle on which the surface of the ball 12 is located is the same, not variable.
According to the hydraulic motor provided by the embodiment of the invention, the pressure relief is completed by arranging the pressure relief groove 4 on the ball head 12 or the ball socket, and the diameter of the ball head 12 is single and unchanged, so that the hydraulic motor is convenient to process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (7)
1. A plunger assembly for a bent-axis plunger motor, comprising: a plunger and a spindle; the plunger comprises a ball head and a plunger rod; a ball socket is arranged on the main shaft; the ball head is rotatably arranged in the ball socket; the top of the ball head is provided with a static pressure groove;
a pressure relief groove is formed in the ball head or the ball socket; one end of the pressure relief groove is communicated with the static pressure groove, and the other end of the pressure relief groove is communicated with the motor inner shell;
the pressure relief groove is arranged on the outer wall of the ball head; the pressure relief groove comprises a top pressure relief groove; one end of the top pressure relief groove is communicated with the static pressure groove, and the other end of the top pressure relief groove extends to the equator of the ball head;
a return disc is arranged between the edge of the ball socket and the ball head;
the pressure relief groove also comprises a bottom pressure relief groove; one end of the bottom pressure relief groove is communicated with the top pressure relief groove, and the other end of the bottom pressure relief groove extends out of the joint of the return disc and the ball head.
2. The plunger assembly for a bent-axis plunger motor of claim 1, wherein the pressure relief groove is linear.
3. The plunger assembly for a bent-axis plunger motor of claim 1, wherein the pressure relief groove is helical.
4. The plunger assembly for a bent-axis plunger motor of claim 2, wherein the pressure relief groove is plural;
the pressure relief grooves are sequentially and uniformly arranged along the circumferential direction of the ball socket at intervals.
5. The plunger assembly for a bent-axis plunger motor as claimed in any one of claims 1-4, wherein the hydrostatic groove is annular.
6. The plunger assembly for a bent-axis plunger motor of claim 5, wherein the hydrostatic slot is plural; the plurality of static pressure grooves are sequentially arranged on the outer wall of the ball head at intervals along the length direction of the plunger rod.
7. A bent axis plunger motor comprising a plunger assembly for a bent axis plunger motor according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710781401.9A CN107387350B (en) | 2017-09-01 | 2017-09-01 | Plunger assembly for oblique plunger motor and oblique plunger motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710781401.9A CN107387350B (en) | 2017-09-01 | 2017-09-01 | Plunger assembly for oblique plunger motor and oblique plunger motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107387350A CN107387350A (en) | 2017-11-24 |
| CN107387350B true CN107387350B (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710781401.9A Active CN107387350B (en) | 2017-09-01 | 2017-09-01 | Plunger assembly for oblique plunger motor and oblique plunger motor |
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| CN (1) | CN107387350B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113172543B (en) * | 2021-05-01 | 2022-07-08 | 金乡县恒海液压机械有限公司 | Inclined shaft type plunger motor small-opening spherical concave precision grinding machine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6434479U (en) * | 1987-08-25 | 1989-03-02 | ||
| US5392693A (en) * | 1994-03-02 | 1995-02-28 | Caterpillar Inc. | Piston assembly for a fluid translating device |
| CN201196146Y (en) * | 2008-04-18 | 2009-02-18 | 卢堃 | Cambered axle type spherical surface valve axial plunger variable displacement pump |
| DE102009005390A1 (en) * | 2009-01-21 | 2010-07-22 | Robert Bosch Gmbh | Axial piston machine in bent axis design |
| CN102606378B (en) * | 2012-03-21 | 2014-11-26 | 北京工业大学 | Full water lubrication pass shaft type water hydraulic piston motor |
| CN207111328U (en) * | 2017-09-01 | 2018-03-16 | 杭州力龙液压有限公司 | Plunger assembly and inclined plunger motor for inclined plunger motor |
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