CN220726481U

CN220726481U - Shell structure for radial plunger motor, sand mold and radial plunger motor

Info

Publication number: CN220726481U
Application number: CN202321043451.4U
Authority: CN
Inventors: 万延江; 克里斯·斯芮芙; 陈如桓; 陈晓元; 邱龙涛; 李琳桦
Original assignee: Danfoss Power Solutions Jiangsu Co Ltd
Current assignee: Danfoss AS
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2024-04-05
Anticipated expiration: 2033-04-28

Abstract

The present application provides a housing structure for a radial plunger motor a sand mold and a radial plunger motor, the shell structure is integrally formed with a high-pressure oil hole, a low-pressure oil hole, a plurality of flow distribution runners and an annular runner connecting the high-pressure oil hole and the low-pressure oil hole with the flow distribution runners; the shell structure is also provided with a sand core supporting hole, the outer side of at least one annular runner in the radial direction is communicated with the sand core supporting hole, to support the annular runner core during casting by supporting the core to form the core support holes. According to the technical scheme, through the arrangement of the sand core supporting holes, the annular runner sand core can be supported by the supporting sand core when the shell structure is cast, so that the strength of the annular runner sand core is improved, and the casting success rate is improved.

Description

Housing structure for radial plunger motor Sand mould and radial plunger motor

Technical Field

The application relates to the technical field of hydraulic pressure, in particular to a shell structure for a radial plunger motor, a sand mold and the radial plunger motor.

Background

Radial plunger motors generally comprise a housing, a rotating shaft mounted in the housing, and a cylinder mounted in the housing, on which a plunger is disposed in a plunger hole, the plunger being capable of reciprocating under the action of hydraulic oil in the plunger hole and guided cooperation of a continuous curved surface of the inner surface of the housing.

To distribute hydraulic oil into the plunger hole and drain hydraulic oil from the plunger hole, in some radial plunger motors, an annular flow passage and a flow distribution flow passage are provided in a housing, the shell of the type has the advantages that due to the complex internal flow passage, the sand core is easy to break, the casting is difficult, the sand removal is difficult, and the rejection rate is high.

In one current manner of housing construction, to prevent breakage of the inner runner core, an additional support structure (chaplet) is employed to support the inner runner core, wherein the chaplet is fused to the casting during casting to become a part of the casting, but there is a possibility of the chaplet being insoluble in the casting during casting, resulting in defects in the casting.

Disclosure of Invention

In view of this, this application provides a radial plunger motor's shell structure, sand mould and radial plunger motor to solve the problem that the casing casting degree of difficulty of present radial plunger motor is big, the rejection rate is high.

According to an aspect of the present application, there is provided a housing structure for a radial plunger motor, the housing structure being integrally formed with a high-pressure oil hole, a low-pressure oil hole, a plurality of distribution flow passages, and an annular flow passage connecting the high-pressure oil hole and the low-pressure oil hole with the distribution flow passages;

the shell structure is also provided with a sand core supporting hole, and at least one annular runner is communicated with the sand core supporting hole on the outer side in the radial direction so as to support an annular runner sand core used for forming the annular runner through a supporting sand core used for forming the sand core supporting hole during casting.

In one embodiment, two sand core supporting holes are communicated with the same annular flow passage.

In one embodiment, a plurality of the sand core supporting holes are arranged on the same annular runner, wherein the angular interval between two adjacent sand core supporting holes in the circumferential direction is at least 60 degrees.

In one embodiment, the plurality of annular flow channels includes a first annular flow channel, a second annular flow channel, a third annular flow channel, and a fourth annular flow channel;

the first annular flow passage is directly communicated with one of the high-pressure oil hole and the low-pressure oil hole, the fourth annular flow passage is directly communicated with the other, the second annular flow passage is communicated with and disconnected from the first annular flow passage through a multi-speed valve, and the third annular flow passage is communicated with and disconnected from the fourth annular flow passage through the multi-speed valve;

the second annular flow passage and the third annular flow passage are respectively communicated with the sand core supporting holes.

In one embodiment, the second annular runner and the third annular runner are respectively provided with two sand core supporting holes.

In one embodiment, a valve hole for installing the multi-speed valve is formed in the shell structure, and the valve hole is respectively communicated with the first annular flow passage, the second annular flow passage, the third annular flow passage and the fourth annular flow passage;

wherein, each the angle interval of psammitolite supporting hole with the valve opening is 45 degrees at least in the circumference.

In one embodiment, the inner wall of the sand core supporting hole is threaded so as to be capable of being plugged by screwing a plug into the sand core supporting hole.

According to another aspect of the present application there is also provided a sand mould for casting a housing structure as described above, characterised in that the sand mould comprises an annular runner core for forming the annular runner, a distribution runner core for forming the distribution runner and a sand shell for forming the outer surface of the housing structure,

wherein the sand mold further comprises a support sand core for forming the support sand core hole, the support sand core connecting at least one of the annular runner sand cores to the sand shell.

According to yet another aspect of the present application, there is also provided a radial plunger motor including a housing, a rotating shaft mounted to the housing, and a cylinder assembly mounted within the housing; wherein,

a continuous curved surface is arranged in the shell; the cylinder body assembly comprises a cylinder body arranged on the rotating shaft and a plunger arranged in a plunger hole on the cylinder body, and the plunger can be guided by the continuous curved surface to reciprocate under the action of hydraulic oil in the plunger hole;

wherein the housing comprises a housing structure as described above.

In one embodiment, the housing includes a front housing and a rear housing connected to each other, the front housing has the continuous curved surface formed therein, and the housing structure is the rear housing.

The technical scheme that this application provided through set up the psammitolite supporting hole on shell structure, can adopt to support the psammitolite when casting shell structure and support annular runner psammitolite, improves the intensity of annular runner psammitolite to help improving the cast success rate of casing, through setting up the support psammitolite moreover, the psammitolite supporting hole that forms in the casing after the casting can be used as the sand cleaning hole of annular runner, conveniently washs annular runner psammitolite.

Additional features and advantages of the present application will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:

FIG. 1 is a schematic structural view of a radial plunger motor according to one embodiment of the present application;

FIG. 2 is a schematic cross-sectional view at A-A of FIG. 1;

FIG. 3 is a schematic cross-sectional view at B-B in FIG. 1;

FIG. 4 is a schematic view of an internal flow passage of a housing structure in accordance with one embodiment of the present application;

FIG. 5 is a schematic view of the internal flow passage of FIG. 4 from another perspective;

FIG. 6 is a schematic view of the internal flow passage of FIG. 4 from one end;

fig. 7 is a schematic illustration of a sand core and sand shell mating cast shell structure in accordance with an embodiment of the present application.

Reference numerals illustrate:

1-a shell structure; 11-annular flow channels; 11 A-A first annular flow passage; 11 b-a second annular flow channel; 11 c-a third annular flow channel; 11 d-fourth annular flow channel; 12-distributing flow channels; 13-supporting the sand core hole; 14-valve hole; 2-a front housing; 3-rotating shaft; 4-cylinder; 5-a plunger; 6-friction plate assembly; 7-multi-speed valve; 8-a plug; 100-sand cores; 111-an annular runner sand core; 111 A-A first annular runner sand core; 111 b-a second annular runner sand core; 111 c-a third annular runner sand core; 111 d-a fourth annular runner sand core; 112-distributing flow channel sand cores; 113-supporting the sand core; 114-valve hole sand core; 115-a high-pressure oil hole sand core; 116-low pressure oil hole sand core.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure. In the case of no conflict, the present application, embodiments and features of the embodiments may be controlled in combination with each other.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "axial," "radial," "circumferential," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application. In addition, "inner and outer" refer to inner and outer with respect to the outline of each component itself.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

The present application provides a housing structure for a radial plunger motor, the housing structure is formed by casting. Referring to the housing structure 1 shown in fig. 1-3, a plurality of annular flow channels 11 and a flow distribution flow channel 12 communicated with each annular flow channel 11 are formed inside the housing structure 1, the plurality of flow distribution flow channels 12 are radially distributed and axially extend, a high-pressure oil hole and a low-pressure oil hole (not shown in the drawings) are further formed in the housing structure 1, at least one annular flow channel 11 is a high-pressure flow channel for conveying hydraulic oil entering from the high-pressure oil hole to the connected flow distribution flow channel 12, and the hydraulic oil entering from the high-pressure oil hole is distributed into a plunger hole of the cylinder 4 for mounting the plunger 5 through the annular flow channel 11 serving as the high-pressure flow channel and the connected flow distribution flow channel 12 so as to push the plunger 5 to move radially outwards; at least one annular flow passage 11 is a low-pressure flow passage for delivering the hydraulic oil introduced from the flow distribution flow passage 12 to the low-pressure oil hole, and when the plunger 5 moves radially inward, the hydraulic oil in the plunger hole enters the annular flow passage 11 as the low-pressure flow passage through the corresponding flow distribution flow passage, and then returns to the oil tank through the low-pressure oil hole.

The shell structure 1 is further provided with a sand core supporting hole 13, and the outer side of at least one annular runner 11 in the radial direction is communicated with the sand core supporting hole 13, so that the annular runner sand core 111 for forming the annular runner 11 is supported by the supporting sand core 113 for forming the sand core supporting hole 13 during casting.

Fig. 7 shows a schematic diagram of a casting of a shell structure 1 by using a sand core 100 with a supporting sand core 113, wherein the sand core 100 comprises an annular runner sand core 111 and the supporting sand core 113 connected with the annular runner sand core 111, the sand core 100 is matched with a sand shell 200 for use in casting, the supporting sand core 113 of the sand core 100 is supported on the sand shell 200, the supporting sand core 113 can play a role in supporting and reinforcing the annular runner sand core 111, breakage of the supporting sand core is avoided, a molten material is poured between the sand core 100 and the sand shell 200, and the molten material is cooled and solidified to form the shell structure 1. After the shell structure 1 is molded, the annular runner 11 of the shell structure 1 is formed after the sand of the annular runner sand core 111 is removed, and the sand core supporting hole 13 is formed after the sand of the supporting sand core 113 is removed.

The technical scheme that this application provided through setting up psammitolite supporting hole 13, can adopt to support psammitolite 113 to support annular runner psammitolite 111 when casting shell structure 1 to improve annular runner psammitolite 111's intensity, thereby help improving the foundry into power, through setting up supporting psammitolite 113 moreover, the psammitolite supporting hole 113 that forms in shell structure 1 after the casting can be used as annular runner 11's sand cleaning hole, conveniently sand annular runner psammitolite 111.

In one embodiment, two sand core supporting holes 13 are communicated with the same annular flow passage 11, and of course, the number of the sand core supporting holes is not limited to two, and one or more sand core supporting holes can be used.

In one embodiment, a plurality of the sand core supporting holes 13 are provided on the same annular runner 11, wherein the angular interval between two adjacent sand core supporting holes 13 in the circumferential direction is at least 60 degrees.

The number and arrangement positions of the supporting sand core holes 13 can be flexibly arranged according to the structure communicated with the annular runner 11, and when the annular runner sand cores are less connected and supported in a weaker structure, a plurality of supporting sand core holes 13 can be provided, so that the same annular runner sand core 111 can be supported by a plurality of supporting sand cores 113. Of course, in order to avoid leakage of the annular runner, under the condition of meeting the supporting strength of the sand core of the annular runner, the supporting sand core 113 is adopted as little as possible, and only the supporting sand core 113 is required to be arranged at the weak position of the sand core 111 of the annular runner, which is required to be structurally supported, so that the situation that leakage occurs due to the fact that the supporting sand core hole 13 on the shell structure 1 is not tightly sealed is reduced.

In one embodiment, the plurality of annular flow passages 11 includes a first annular flow passage 11a, a second annular flow passage 11b, a third annular flow passage 11c, and a fourth annular flow passage 11d.

Wherein the first annular flow passage 11a is communicated with the high-pressure oil hole of the shell structure 1, and the second annular flow passage 11b is communicated with and disconnected from the first annular flow passage 11a through the multi-speed valve 7; the fourth annular flow passage 11d communicates with the low-pressure oil hole of the housing structure 1, and the third annular flow passage 11c is provided to communicate with and to be disconnected from the fourth annular flow passage 11d through the multi-speed valve 7 (the description of the high-pressure oil hole and the low-pressure oil hole throughout this specification is for convenience only, the oil pressures of the two oil holes may be interchanged, i.e., the first annular flow passage 11a communicates with the low-pressure oil hole, and the fourth annular flow passage 11d communicates with the high-pressure oil hole); wherein, the second annular runner 11b and the third annular runner 11c are respectively communicated with and provided with a sand core supporting hole 13.

Alternatively, the second annular flow passage 11b and the third annular flow passage 11c are provided with two sand core supporting holes 13, respectively.

In one embodiment, the casing structure 1 is provided with a valve hole 14 for installing the multi-speed valve 7, and the valve hole 14 is respectively communicated with the first annular flow passage 11a, the second annular flow passage 11b, the third annular flow passage 11c and the fourth annular flow passage 11 d; wherein each of the core support holes 13 is angularly spaced from the valve hole 14 by at least 45 degrees in the circumferential direction.

The technical solution provided in the present application is specifically described below according to a specific embodiment.

Referring to the embodiment shown in fig. 1-3, fig. 1-3 show a radial plunger motor configuration employing a housing configuration 1. Wherein, the inside of the housing structure 1 is formed with a first annular runner 11a, a second annular runner 11b, a third annular runner 11c and a fourth annular runner 11d, the first annular runner 11a is directly communicated with a high-pressure oil hole formed on the housing structure 1, and the fourth annular runner 11d is directly communicated with a low-pressure oil hole formed on the housing structure 1. The interior of the housing structure 1 is also formed with a flow distribution flow passage 12 communicating with each annular flow passage, each annular flow passage communicating with a portion of the flow distribution flow passages 12 therein, the flow distribution flow passages 12 extending generally axially for return oil to the plungers Kong Gongyou of the cylinders 4 having the plungers 5 and plunger holes.

Wherein the radial plunger motor in this embodiment is further provided with a multi-speed valve 7, when the multi-speed valve 7 is arranged such that the second annular flow passage 11b communicates with the first annular flow passage 11a, and the third annular flow passage 11c communicates with the fourth annular flow passage 11d, both the first annular flow passage 11a and the second annular flow passage 11b are used for the plunger Kong Gongyou, and both the third annular flow passage 11c and the fourth annular flow passage 11d are used for the plunger Kong Huiyou. The multi-speed valve 7 is arranged such that when the second annular flow passage 11b and the third annular flow passage 11c are short-circuited, the communication of the second annular flow passage 11b with the first annular flow passage 11a is disconnected, and the communication of the third annular flow passage 11c with the fourth annular flow passage 11d is disconnected, at which time only the first annular flow passage 11a is used for the plunger Kong Gongyou and the fourth annular flow passage 11d is used for the plunger Kong Huiyou.

Fig. 4-6 illustrate the internal flow channels used to cast the housing structure 1, and since the internal flow channels are formed by the sand core during casting, the internal flow channels are substantially identical to the sand core used to form the internal flow channels, the structure illustrated in fig. 4-6 is considered herein to be the sand core 100 used to form the internal flow channels of the housing structure 1 for ease of description. As shown in fig. 4 to 6, the valve core 100 for forming the housing structure 1 includes a first annular flow passage core 111a for forming the first annular flow passage 11a, a second annular flow passage core 111b for forming the second annular flow passage 11b, a third annular flow passage core 111c for forming the third annular flow passage 11c, a fourth annular flow passage core 111d for forming the fourth annular flow passage 11d, a flow distribution flow passage core 112 for forming the flow distribution flow passage 12, a high-pressure oil hole core 115 for forming the high-pressure oil hole, and a low-pressure oil hole core 116 for forming the low-pressure oil hole.

Since the first annular flow passage sand core 111a is provided with the high-pressure oil Kong Shaxin, the fourth annular flow passage sand core 111d is provided with the low-pressure oil Kong Shaxin, and the high-pressure oil Kong Shaxin and the low-pressure oil hole sand core 116 are relatively thick and firm, the first annular flow passage sand core 111a may be supported by the high-pressure oil hole sand core 115 (supported on the outside-connected sand shell), the fourth annular flow passage sand core 111d may be supported by the low-pressure oil hole sand core 116, and in addition, each annular flow passage sand core may be supported by the respective connected flow distribution passage sand cores 112 and may also be supported by the valve hole sand core 114 (refer to fig. 5, the valve core sand core 114 is used to form the valve hole 14 for mounting the multi-speed valve 7), in which case the first annular flow passage sand core 11a and the fourth annular flow passage sand core 11d may not be provided with the supporting sand core 113. Of course, the first annular runner core 11a and the fourth annular runner core 11d may also be provided with support cores 113 for reinforcement purposes and for ease of sand removal.

And the second annular runner sand core 111b and the third annular runner sand core 111c have fewer supporting structures and are easy to break, so as shown in fig. 4-6, two supporting sand cores 113 are respectively arranged on the second annular runner sand core 111b and the third annular runner sand core 111c, as is obvious from fig. 2 and 3, two sand core supporting holes 13 are arranged on the second annular runner 11b in a communicating manner, two sand core supporting holes 13 are arranged on the third annular runner 11c in a communicating manner, and the two sand core supporting holes 13 on each annular runner are approximately positioned on two opposite sides of the second annular runner 11 b.

In addition, since the four annular runner cores 111 are all connected with the valve hole core 114, the core supporting hole 13 may be disposed at a position having a distance from the valve hole core 114, and specifically, an angular interval between the core supporting hole 13 and the valve hole 14 in the circumferential direction may be set to be at least 45 degrees, so that the supporting core 113 and the valve hole core 114 support the annular runner cores at different circumferential positions.

Of course, the number and arrangement positions of the supporting sand core holes 13 are not limited, but the number of supporting sand cores should be as small as possible while the weak positions of the annular runner sand cores 111 lacking support are provided with the supporting sand cores to satisfy the supporting function.

In addition, when the housing structure 1 is molded and applied to a radial plunger motor, the core support hole 13 needs to be plugged by the plug 8. Optionally, the inner wall of each sand core supporting hole 13 is threaded, as shown in fig. 2 and 3, the plug 8 can be plugged by being connected to the sand core supporting hole 13 through threads, and a sealing ring can be arranged between the plug 8 and the sand core supporting hole 13 for sealing.

In one embodiment, as shown in fig. 1, the housing of the radial plunger motor includes a rear housing and a front housing 2 connected together, and the housing structure 1 provided herein is a rear housing, and a central hole is further formed in the housing structure 1, and is used for accommodating a friction plate assembly 6, where the friction plate assembly 6 is used for braking the rotating shaft 3, and the specific working principle of the braking is known to those skilled in the art and is not specifically described herein.

According to a further aspect of the present application there is also provided a sand mould arranged for casting a housing structure 1 as described above, with reference to fig. 4-6, the sand mould comprising an annular runner core 111 for forming an annular runner 11, a distribution runner core 112 for forming a distribution runner 12, and a shell (the shell not being shown in fig. 4-6, only the core portion of the sand mould being shown) for forming the outer surface of the housing structure 1, wherein the sand mould further comprises a support core 113 for forming support core holes 13, the support core 113 connecting at least one annular runner core 111 to the shell. In addition, each annular runner core 111 may also be supported by a connected distribution runner core 112; each annular runner core 111 is connected to a plurality of split runner cores 112, and the split runner cores 112 are generally disposed to extend axially and are supported on the sand shell.

Other specific arrangements of the sand core 100 may correspond to the arrangement of the housing structure 1 as described above, and will not be described one by one. For example, in one embodiment, the housing structure 1 is provided with four annular runners 11, where the second annular runner 11b and the third annular runner 11c are each provided with two supporting sand core holes 13, and the corresponding sand core 100 is correspondingly provided with four annular runner sand cores 111, where the second annular runner sand core 111b and the third annular runner sand core 111c are each provided with two supporting sand cores 113.

According to a further aspect of the present application there is also provided a radial plunger motor comprising a housing, a rotatable shaft 3 mounted to the housing, and a cylinder assembly mounted within the housing; wherein,

a continuous curved surface is arranged in the shell; the cylinder assembly comprises a cylinder 4 arranged on the rotating shaft 3 and a plunger 5 arranged in a plunger hole on the cylinder 4, wherein the plunger 5 can reciprocate under the action of hydraulic oil in the plunger hole and the guidance of a continuous curved surface;

the housing comprises the housing structure 1, hydraulic oil entering from the high-pressure oil hole enters the corresponding plunger hole through at least one annular flow passage 11 and a connected distributing flow passage 12, and hydraulic oil discharged from the plunger hole is discharged to the low-pressure oil hole through the corresponding distributing flow passage 12 and the at least one annular flow passage 11.

The shell comprises a front shell 2 and a rear shell which are connected with each other, the front shell 2 is internally provided with the continuous curved surface, and the shell structure 1 is the rear shell.

The foregoing description of the preferred embodiments of the present utility model is not intended to limit the utility model to the precise form disclosed, and any modifications, equivalents, and alternatives falling within the spirit and principles of the present utility model are intended to be included within the scope of the present utility model.

Claims

1. A housing structure for a radial plunger motor, the housing structure being integrally formed with a high-pressure oil hole, a low-pressure oil hole, a plurality of flow distribution runners, and an annular runner connecting the high-pressure oil hole and the low-pressure oil hole with the flow distribution runners;

the casting device is characterized in that a sand core supporting hole is further formed in the shell structure, and the sand core supporting hole is communicated with the outer side of at least one annular runner in the radial direction, so that an annular runner sand core used for forming the annular runner is supported through a supporting sand core used for forming the sand core supporting hole during casting.

2. The housing structure of claim 1 wherein two of said core support apertures are in communication with the same annular flow passage.

3. The housing structure of claim 2 wherein a plurality of said core support apertures are provided in a single one of said annular flow passages, wherein adjacent two core support apertures are angularly spaced at least 60 degrees apart in the circumferential direction.

4. The housing structure of claim 1 wherein the plurality of annular flow passages includes a first annular flow passage, a second annular flow passage, a third annular flow passage, and a fourth annular flow passage;

5. The housing structure of claim 4, wherein the second annular runner and the third annular runner are each provided with two of the sand core supporting holes.

6. The housing structure of claim 4 wherein a valve bore is provided in the housing structure for mounting the multi-speed valve, the valve bore being in communication with the first annular flow passage, the second annular flow passage, the third annular flow passage and the fourth annular flow passage, respectively;

7. The housing structure of any one of claims 1-6 wherein the inner wall of the core support bore is threaded to enable plugging by threading a plug into the core support bore.

8. A sand mold for casting a housing structure according to any one of claims 1-7, wherein the sand mold comprises an annular runner core for forming the annular runner, a distribution runner core for forming the distribution runner, and a sand shell for forming an outer surface of the housing structure,

9. A radial plunger motor, comprising a housing, a rotating shaft mounted to the housing, and a cylinder assembly mounted within the housing; wherein,

wherein the housing comprises a housing structure according to any one of claims 1-7.

10. The radial plunger motor of claim 9, wherein said housing comprises a front housing and a rear housing connected to each other, said front housing having said continuous curved surface formed therein, said housing structure being said rear housing.