Axial piston pump / motor

Abstract

The present invention discloses an axial piston pump / motor. The axial piston pump / motor includes a cavity, a bearing, a main shaft, a cylinder body, and a lubricating oil circulation system. The main shaft is rotatably supported in the cavity by the bearing, the cylinder body is sleeved on the outside of the main shaft and rotates synchronously with the main shaft, and the lubricating oil circulation system includes a main oil storage chamber between the cylinder body and the main shaft, a bearing oil storage chamber located on one side of the bearing, and a lubricating oil path for connecting the main oil storage chamber and the bearing oil storage chamber. The axial piston pump of the present invention arranges a lubricating oil circulation system in the cavity so that the lubricating oil in the main oil storage chamber can flow to the bearing oil storage chamber through the circulation flow path, thereby flushing the bearing, thereby taking away the heat generated when the bearing is working, so as to effectively ensure the heat dissipation of the bearing.

Description

Technical Field

[0001] The present invention relates to the field of fluid hydraulic technology, and in particular to an axial piston pump / motor. Background Art

[0002] Bearings are essential key components of hydraulic axial piston pump equipment. Whether they can work properly is related to whether the axial piston pump can work properly. A lot of heat will be generated during operation. In normal use, this heat will be dissipated to the outside through the heat conduction of lubricants and bearing seats, so that the bearings can be kept at normal working temperature. However, when the bearings are running at high speed or under heavy load, the heat generated increases sharply. The heat conduction of lubricants and bearing seats can only dissipate limited heat, and cannot dissipate all the heat in time. Since the heat cannot be dissipated in time, the temperature of the bearing will continue to rise, which may eventually induce the failure of the lubricant and cause damage to the bearing, and the matching axial piston pump will lose its normal working ability. Summary of the invention

[0003] The object of the present invention is to provide an axial piston pump / motor to effectively ensure the heat dissipation of the bearing.

[0004] The present invention provides an axial piston pump / motor, comprising:

[0005] Cavity;

[0006] Bearings;

[0007] A main shaft is rotatably supported in the cavity through a bearing;

[0008] A cylinder body is sleeved on the outer side of the main shaft and rotates synchronously with the main shaft; and

[0009] The lubricating oil circulation system comprises a main oil storage chamber located between the cylinder body and the main shaft, a bearing oil storage chamber located at one side of the bearing, and a lubricating oil path for connecting the main oil storage chamber and the bearing oil storage chamber.

[0010] In some embodiments, the lubricating oil circuit includes a first lubricating oil circuit from the main oil reservoir chamber to the bearing oil reservoir chamber and a second lubricating oil circuit from the bearing oil reservoir chamber to the main oil reservoir chamber, and the first lubricating oil circuit and the second lubricating oil circuit together form a circulation loop.

[0011] In some embodiments, the first lubricating oil circuit includes a cylinder through hole arranged on the cylinder body, and the cylinder through hole is used to fluidically connect the main oil storage chamber and the cavity; and / or, the second lubricating oil circuit includes a main shaft through hole arranged on the main shaft, and the main shaft through hole is used to fluidically connect the bearing oil storage chamber and the main oil storage chamber.

[0012] In some embodiments, the cylinder through hole includes a cylinder radial through hole provided on the cylinder.

[0013] In some embodiments, the first lubricating oil passage includes a plurality of cylinder radial through holes arranged at intervals along the circumference of the cylinder.

[0014] In some embodiments, the axial piston pump motor also includes an end cover for closing the opening of the cavity, the bearing oil storage chamber is located in the end cover, and the first lubrication oil circuit also includes an oil hole arranged on the end cover, and the oil hole connects the cavity and the bearing oil storage chamber.

[0015] In some embodiments, the spindle through hole includes a spindle axial hole arranged on the spindle and two spindle radial holes respectively arranged at both ends of the spindle axial hole and both connected to the spindle axial hole, one of the two spindle radial holes is connected to the bearing oil storage chamber, and the other of the two spindle radial holes is connected to the main oil storage chamber.

[0016] In some embodiments, the axial piston pump / motor includes two bearings respectively disposed at two ends of the main shaft and two bearing oil storage chambers corresponding to the two bearings.

[0017] In some embodiments, the axial piston pump / motor further includes a valve plate, which together with the cylinder body and the main shaft forms a main oil storage chamber.

[0018] Based on the technical solution provided by the present invention, the axial piston pump / motor includes a cavity, a bearing, a main shaft, a cylinder body and a lubricating oil circulation system. The main shaft is rotatably supported in the cavity by the bearing, the cylinder body is sleeved on the outside of the main shaft and rotates synchronously with the main shaft, and the lubricating oil circulation system includes a main oil storage chamber located between the cylinder body and the main shaft, a bearing oil storage chamber located on one side of the bearing, and a lubricating oil path for connecting the main oil storage chamber and the bearing oil storage chamber. The axial piston pump of the present invention arranges a lubricating oil circulation system in the cavity so that the lubricating oil in the main oil storage chamber can flow to the bearing oil storage chamber through the circulation flow path to flush the bearing, thereby taking away the heat generated when the bearing is working, so as to effectively ensure the heat dissipation of the bearing.

[0019] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It is a schematic cross-sectional structure diagram of an axial piston pump according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 The structural diagram of the cylinder body in FIG.

[0023] Figure 3 for Figure 1 Schematic diagram of the structure of the main axis. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0026] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0027] like Figure 1 As shown, the axial piston pump of the embodiment of the present invention comprises:

[0028] Cavity 1;

[0029] Bearings;

[0030] The main shaft 3 is rotatably supported in the cavity 1 through a bearing;

[0031] The cylinder body 2 is sleeved on the outer side of the main shaft 3 and rotates synchronously with the main shaft 3; and

[0032] The lubricating oil circulation system includes a main oil storage chamber A located between the cylinder body 2 and the main shaft 3, a bearing oil storage chamber located on one side of the bearing, and a lubricating oil path for connecting the main oil storage chamber A and the bearing oil storage chamber.

[0033] The axial piston pump of the embodiment of the present invention provides a lubricating oil circulation system in the cavity 1 so that the lubricating oil in the main oil storage chamber A can flow into the bearing oil storage chamber through the circulation flow path to flush the bearing, thereby taking away the heat generated when the bearing is working, which is conducive to ensuring that the bearing works within a reasonable temperature range. Furthermore, the operation of the bearing within a reasonable temperature range can effectively increase the operating life of the axial piston pump bearing, thereby improving the reliability of the axial piston pump.

[0034] The lubricating oil circulation system of this embodiment can also be used in an axial piston motor.

[0035] According to the following Figures 1 to 3 The structure of an axial piston pump according to a specific embodiment of the present invention is described in detail.

[0036] like Figure 1 As shown, the axial piston pump of this embodiment includes a cavity 1, a main shaft 3, a front bearing 7, a rear bearing 5 and a cylinder body 2. The main shaft 3 is rotatably supported in the cavity 1 by the front bearing 7 and the rear bearing 3. The cylinder body 2 rotates synchronously with the main shaft 3. Specifically, the cylinder body 2 can be connected to the main shaft 3 as a whole through a spline for synchronous rotation.

[0037] The axial piston pump of this embodiment further includes a main oil storage chamber A arranged between the cylinder body 2 and the main shaft 3 , a front bearing oil storage chamber B arranged on one side of the front bearing 7 , and a rear bearing oil storage chamber C arranged on one side of the rear bearing 5 .

[0038] Specifically, Figure 1 As shown, the cylinder body 2 includes an axial through hole, and the axial through hole includes a first axial section and a second axial section of different through hole sizes. The inner surface of the first axial section is arranged to fit the main shaft, and the radius of the second axial section is greater than the radius of the first axial section, so that the inner surface of the second axial section protrudes radially outward relative to the main shaft 3, so that a main oil storage chamber A is formed between the second axial section and the main shaft.

[0039] In order to allow the lubricating oil in the main oil reservoir A to flow to the front bearing 7 and / or the rear bearing 5 to achieve the effect of flushing and cooling the bearings, the lubricating oil circuit of this embodiment includes a first lubricating oil circuit from the main oil reservoir A to the bearing oil reservoir.

[0040] In order to replenish the lubricating oil in the main oil reservoir A, the lubricating oil circuit of this embodiment also includes a second lubricating oil circuit from the bearing oil reservoir to the main oil reservoir A. The first lubricating oil circuit and the second lubricating oil circuit together form a circulation loop.

[0041] In this embodiment, the first lubricating oil circuit includes a cylinder through hole provided on the cylinder body 2, and the cylinder through hole is used for fluid communication between the main oil storage chamber A and the cavity 1. When the cylinder body 2 rotates synchronously with the main shaft 3, the lubricating oil in the main oil storage chamber A is discharged outwardly into the cavity 1 through the cylinder through hole provided on the cylinder body 2 under the action of centrifugal force. At this time, the lubricating oil in the cavity 1 is replenished into the front bearing oil storage chamber B through the gap of the front bearing 7, thereby completing the flushing of the front bearing 7.

[0042] like Figure 1 As shown, the axial piston pump of this embodiment further includes an end cover 4 for closing the opening of the cavity 1, and the rear bearing oil storage chamber C is located in the end cover 4. Therefore, in order to replenish the rear bearing oil storage chamber C with oil and thus flush the rear bearing 5, the first lubricating oil circuit of this embodiment further includes an oil hole 41 provided on the end cover 4, and the oil hole 41 connects the cavity 1 and the rear bearing oil storage chamber C. The lubricating oil in the main oil storage chamber A is discharged outwardly into the cavity 1 through the cylinder through hole opened on the cylinder 2 under the action of centrifugal force. At this time, the lubricating oil in the cavity 1 is replenished into the rear bearing oil storage chamber C through the oil hole opened on the end cover 4, thereby completing the flushing of the rear bearing 5.

[0043] Specifically, Figure 1 and Figure 2 As shown, the cylinder through hole of this embodiment includes a cylinder radial through hole 21 arranged on the cylinder 2. The arrangement of the cylinder radial through hole 21 makes it easier for the lubricating oil to be thrown out into the cavity 1 under the action of centrifugal force.

[0044] In at least one embodiment, the first lubricating oil passage includes a plurality of cylinder radial through holes 21 arranged at intervals along the circumference of the cylinder 2. Such an arrangement is conducive to the efficiency of the lubricating oil being thrown out, thereby improving the flushing effect on the bearing.

[0045] In order to replenish the lubricating oil in the main oil storage chamber A, the second lubricating oil circuit of the present embodiment includes a spindle through hole provided on the spindle 3, and the spindle through hole is used for fluid communication between the bearing oil storage chamber and the main oil storage chamber A. The first lubricating oil circuit connects the lubricating oil from the main oil storage chamber A to the cavity 1, and the oil in the cavity 1 flows to the bearing oil storage chamber. The second lubricating oil circuit connects the lubricating oil in the bearing oil storage chamber to the main oil storage chamber A, thereby completing the circulation of the lubricating oil and realizing automatic flushing of the bearing.

[0046] like Figure 1 and Figure 3 As shown, the spindle through hole of this embodiment includes a spindle axial hole 32 provided on the spindle 3 and two spindle radial holes 31 respectively provided at both ends of the spindle axial hole 32 and both connected to the spindle axial hole 32. One of the two spindle radial holes 31 is connected to the bearing oil storage chamber, and the other of the two spindle radial holes 31 is connected to the main oil storage chamber A.

[0047] The lubricating oil circuit of this embodiment is directly opened on the cylinder body 2 and the main shaft 3, and no additional parts are needed to flush the bearings. In addition, the lubricating oil circuit is opened on the cylinder body 2 and the main shaft 3, and the redundant materials on the cylinder body and the main shaft are removed, and the weight of the cylinder body and the main shaft is reduced. When the pump is working, the rotational inertia of the cylinder body and the main shaft is reduced, and the working load of the front and rear bearings is reduced, which can effectively increase the operating life of the front and rear bearings of the axial piston pump, thereby improving the reliability of the pump.

[0048] like Figure 1 As shown, the axial piston pump of this embodiment further includes a distribution plate 6, which together with the cylinder body 2 and the main shaft 3 encloses a main oil storage chamber A.

[0049] When the axial piston pump of this embodiment is working, the main shaft 3 and the cylinder body 2 are connected as a whole through the spline and rotate at a constant speed. Figure 1 As shown by the arrows in the figure, the lubricating oil in the main oil storage chamber A is discharged outward through the cylinder radial through hole 21 opened on the cylinder body 2 under the action of centrifugal force. At the same time, the lubricating oil in the front bearing oil storage chamber B is replenished to the main oil storage chamber A through the main shaft radial hole 31 and the main shaft axial hole 32 opened on the main shaft 3, and the oil in the rear bearing chamber C directly passes through the rear bearing 5 to replenish the main oil storage chamber A. At this time, the lubricating oil in the cavity 1 is replenished to the front bearing oil storage chamber B and the rear bearing oil storage chamber C through the gap of the front bearing 7 and the oil hole 41 opened on the end cover 4. The oil flow process in the two oil circuits is the automatic flushing process of the front and rear bearings.

[0050] The axial piston pump of this embodiment has at least the following beneficial effects by providing a lubricating oil circulation system:

[0051] By flushing the front and rear bearings, the oil flowing through the gap between the bearing rolling elements will take away the heat generated by the bearings during operation, ensuring that the bearings operate within a reasonable temperature range, which is conducive to the formation of a good lubricating oil film in the bearing raceway and realizing pure liquid lubrication. It can effectively increase the service life of the front and rear bearings of the axial piston pump, thereby improving the reliability of the axial piston pump.

[0052] By flushing the front and rear bearings, the oil flowing through the gap between the bearing rolling elements will carry away the micro-metal powder generated by the bearing itself during operation or the micro-metal powder generated by other parts, preventing them from depositing in the bearing raceway and increasing bearing wear. This can effectively increase the service life of the front and rear bearings of the axial piston pump, thereby improving the reliability of the pump.

[0053] By flushing the front and rear bearings, the oil flowing through the gaps between the rolling elements of the bearings will provide the bearings with sufficient cooling and lubricating oil, which is beneficial to the lubrication of the front and rear bearings, and can effectively increase the service life of the front and rear bearings of the axial piston pump, thereby improving the reliability of the pump.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. An axial piston pump / motor, characterized in that: include: Cavity (1); Bearings; A main shaft (3) rotatably supported in the cavity (1) via the bearing; A cylinder body (2) is sleeved on the outer side of the main shaft (3) and rotates synchronously with the main shaft (3); as well as A lubricating oil circulation system, comprising a main oil storage chamber (A) located between the cylinder body (2) and the main shaft (3), a bearing oil storage chamber located on one side of the bearing, and a lubricating oil passage for connecting the main oil storage chamber (A) and the bearing oil storage chamber; The lubricating oil circuit comprises a first lubricating oil circuit from the main oil storage chamber (A) to the bearing oil storage chamber and a second lubricating oil circuit from the bearing oil storage chamber to the main oil storage chamber (A), the first lubricating oil circuit and the second lubricating oil circuit together forming a circulation loop, the first lubricating oil circuit comprises a cylinder through hole provided on the cylinder body (2), the cylinder through hole is used for fluidly connecting the main oil storage chamber (A) and the cavity (1), the cylinder through hole comprises a cylinder radial through hole (21) provided on the cylinder body (2), when the cylinder body (2) rotates synchronously with the main shaft (3), the lubricating oil in the main oil storage chamber (A) is discharged outwardly into the cavity (1) through the cylinder radial through hole (21) under the action of centrifugal force.

2. The axial piston pump / motor according to claim 1, characterized in that: The second lubricating oil circuit comprises a main shaft through hole provided on the main shaft (3), the main shaft through hole being used for fluid communication between the bearing oil storage chamber (A) and the main oil storage chamber (A).

3. The axial piston pump / motor according to claim 1, characterized in that: The first lubricating oil passage comprises a plurality of cylinder radial through holes (21) arranged at intervals along the circumference of the cylinder (2).

4. The axial piston pump / motor according to claim 1, characterized in that: The axial piston pump motor further comprises an end cover (4) for closing an opening of the cavity (1); the bearing oil storage chamber is located within the end cover (4); the first lubricating oil circuit further comprises an oil passage hole (41) provided on the end cover; the oil passage hole (41) communicates with the cavity (1) and the bearing oil storage chamber.

5. The axial piston pump / motor according to claim 2, characterized in that: The spindle through hole comprises a spindle axial hole (32) provided on the spindle (3) and two spindle radial holes (31) respectively provided at two ends of the spindle axial hole (32) and both connected to the spindle axial hole (32), one of the two spindle radial holes (31) being connected to the bearing oil storage chamber, and the other of the two spindle radial holes (31) being connected to the main oil storage chamber (A).

6. The axial piston pump / motor according to any one of claims 1 to 5, characterized in that: The axial piston pump / motor comprises two bearings respectively arranged at two ends of the main shaft (3) and two bearing oil storage chambers corresponding to the two bearings.

7. The axial piston pump / motor according to claim 1, characterized in that: The axial piston pump / motor also includes a distribution plate, which together with the cylinder body (2) and the main shaft (3) encloses the main oil storage chamber (A).

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