Cycloidal hydraulic motor

Abstract

The present invention provides a gerotor hydraulic motor. The gerotor hydraulic motor comprises a rotor-stator pair, a leakage oil channel and one or more groups of components to be cooled. The leakage oil channel guides the hydraulic oil leaked from the axial side of the rotor-stator pair to flow through the components to be cooled so as to cool the components to be cooled. The present invention guides the hydraulic oil leaked from the housing of the gerotor hydraulic motor to flow through a specially designed flow path (i.e., an internal cooling circuit) to take away the heat generated by the friction of the parts inside the housing of the gerotor hydraulic motor, thereby achieving the purpose of reducing the temperature inside the housing of the gerotor hydraulic motor and extending the service life of the gerotor hydraulic motor.

Description

Technical Field

[0001] The present invention relates to a gerotor hydraulic motor, and more particularly to a gerotor hydraulic motor with an internal cooling circuit. Background Art

[0002] When the cycloid hydraulic motor is working, a lot of heat will be generated due to the friction of the bearing itself and the friction between the internal and external teeth (i.e., internal and external splines) of the output shaft and the transmission shaft, which will significantly increase the temperature inside the housing of the cycloid hydraulic motor, causing the parts inside the housing to work in a high temperature environment for a long time. Therefore, it is easy to cause parts failure and shorten the service life of the cycloid hydraulic motor. Summary of the invention

[0003] In order to solve the above technical problems, the present invention guides the hydraulic oil leaked from the housing of the gerotor hydraulic motor (hereinafter referred to as "leakage oil") to flow through a specially designed flow path (i.e., an internal cooling circuit) to take away the heat generated by the friction of parts inside the housing of the gerotor hydraulic motor, thereby achieving the purpose of reducing the temperature inside the housing of the gerotor hydraulic motor and extending the service life of the gerotor hydraulic motor.

[0004] The present invention provides a gerotor hydraulic motor, comprising a rotor-stator pair and one or more groups of components to be cooled. The gerotor hydraulic motor also comprises a leakage oil channel, wherein the leakage oil channel guides hydraulic oil leaked from the axial side of the rotor-stator pair to flow through the components to be cooled so as to cool the components to be cooled.

[0005] The cycloid hydraulic motor also includes an output shaft, a housing, a partition and a first transmission shaft. The partition is arranged between the housing and the rotor-stator pair. The front end of the output shaft extends to the outside of the housing. The rear end of the output shaft is supported by the housing via a bearing and has internal teeth. The front end of the first transmission shaft has external teeth to mesh with the internal teeth of the output shaft, thereby forming a group of components to be cooled. The rear end of the first transmission shaft has external teeth to mesh with the internal teeth of the rotor of the rotor-stator pair, thereby forming a group of components to be cooled. The hydraulic oil leaks from the gap between the rotor-stator pair and the partition to the inside of the cycloid hydraulic motor, so that the space between the first transmission shaft and the rotor-stator pair, the partition, the housing, and the output shaft constitutes the first part of the leakage oil channel.

[0006] The output shaft has a central hole and one or more radial holes, and the central hole and the one or more radial holes constitute the second part of the leakage oil passage. The central hole is arranged toward the front end of the first transmission shaft and communicates with the first part of the leakage oil passage, and the radial holes extend outward from the central hole along the radial direction of the output shaft to a position communicating with the bearing.

[0007] The bearing may include at least two bearings and constitute a group of components to be cooled. A spacer is provided between two adjacent bearings, the spacer is annular and has one or more oil leakage holes, the oil leakage holes are connected to the oil return holes provided on the housing, and together constitute the third part of the leakage oil channel. The third part of the leakage oil channel is connected to the second part of the leakage oil channel through the gap of the bearing itself.

[0008] The spacer may have a plurality of oil drain holes, and the outer diameter of the spacer is smaller than the inner diameter of the housing, so that a gap is formed between the outer circumference of the spacer and the inner circumference of the housing, and the plurality of oil drain holes of the spacer are connected with the oil return hole on the housing through the gap. Optionally, an oil guide groove is formed on the outer circumference of the spacer, and the plurality of oil drain holes of the spacer are connected with the oil return hole on the housing through the oil guide groove. The oil return hole is aligned with the gap or the oil guide groove.

[0009] The cycloid hydraulic motor also includes a rear cover, the housing, the partition, the rotor-stator pair and the rear cover are connected together in sequence, the leakage oil channel also includes an oil return channel, the oil return channel extends from the oil return hole through the housing, the partition, the rotor-stator pair and the rear cover in sequence, the oil return channel leads to the oil return port or the external oil leakage port of the cycloid hydraulic motor, and constitutes the fourth part of the leakage oil channel.

[0010] Alternatively, the gerotor hydraulic motor further comprises a distribution plate and a rear cover, the housing, the partition, the rotor-stator pair, the distribution plate and the rear cover are sequentially connected together, the leakage oil passage further comprises an oil return passage, the oil return passage extends from the oil return hole through the housing, the partition, the rotor-stator pair, the distribution plate and the rear cover in sequence, the oil return passage leads to the oil return port or the external oil leakage port of the gerotor hydraulic motor, constituting the fourth part of the leakage oil passage.

[0011] Optionally, the gerotor hydraulic motor further includes a distribution plate, a distribution valve and a second transmission shaft. The distribution plate is arranged between the rotor-stator pair and the distribution valve. The front end of the second transmission shaft has external teeth to mesh with the internal teeth of the rotor of the rotor-stator pair, thereby forming a group of components to be cooled. The rear end of the second transmission shaft has external teeth to mesh with the internal teeth of the distribution valve, thereby forming a group of components to be cooled. The hydraulic oil leaks from the gap between the distribution valve and the distribution plate, and the gap between the distribution plate and the rotor-stator pair to the inside of the gerotor hydraulic motor, so that the space between the second transmission shaft and the distribution valve, the distribution plate, and the rotor-stator pair constitutes the fifth part of the leakage oil channel. The first part and the fifth part of the leakage oil channel are interconnected at the rotor-stator pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to facilitate the understanding of the present invention, the present invention is described in more detail below based on exemplary embodiments and in conjunction with the accompanying drawings. The same or similar reference numerals are used in the accompanying drawings to represent the same or similar components. It should be understood that the accompanying drawings are only schematic, and the sizes and proportions of the components in the accompanying drawings are not necessarily accurate.

[0013] Figure 1A 4 is a semi-sectional perspective view of a gerotor hydraulic motor according to an embodiment of the present invention.

[0014] Figure 1B FIG. 4 is a half-section side view of a gerotor hydraulic motor according to an embodiment of the present invention.

[0015] Figure 1C yes Figure 1B Magnified view of area C in FIG.

[0016] Figure 2A and Figure 2B 3 are a perspective view and a side view, respectively, of a spacer according to an embodiment of the present invention.

[0017] Figure 3 is a perspective view of a housing of a gerotor hydraulic motor according to an embodiment of the present invention.

[0018] Figure 4A and Figure 4B 3 are a perspective view and a side view, respectively, of a spacer according to another embodiment of the present invention. DETAILED DESCRIPTION

[0019] Figure 1A 4 is a half-section perspective view of a gerotor hydraulic motor according to an embodiment of the present invention. Figure 1B A half-section side view of a gerotor hydraulic motor according to an embodiment of the present invention. Figure 1C yes Figure 1B Magnified view of area C in FIG.

[0020] refer to Figure 1A and Figure 1B According to the present embodiment, the gerotor hydraulic motor includes a housing 8 and a rear cover 9. A distribution plate 2, a rotor-stator pair 3 and a partition 4 are provided between the housing 8 and the rear cover 9. A plurality of fastening bolts 91 are fastened to the housing 8 through bolt holes in the rear cover 9, the distribution plate 2, the rotor-stator pair 3 and the partition 4. The distribution valve 1 is provided in the rear cover 9 and is adjacent to the distribution plate 2. The front end of the output shaft 6 extends to the outside of the housing 8. The rear end of the output shaft 6 is provided in the housing 8 and has an inner tooth 63, which is engaged with the outer tooth 51 of the front end of the first transmission shaft 5, thereby constituting a first group of components to be cooled.

[0021] The rotor-stator pair 3 includes a stator 31 and a rotor 32. The rear end of the first transmission shaft 5 has external teeth 52, which engage with the internal teeth of the rotor 32, thereby forming a second group of components to be cooled.

[0022] The second transmission shaft 12 is disposed behind the first transmission shaft 5. The front end of the second transmission shaft 12 has external teeth 121, which engage with the internal teeth of the rotor 32, thereby forming a third group of components to be cooled.

[0023] The rear end of the second transmission shaft 12 has external teeth 122 , which are combined with the internal teeth of the distribution valve 1 , thereby forming a fourth group of components to be cooled.

[0024] The output shaft 6 has a central hole 61 and one or more radial holes 62 communicating with the central hole 61. The central hole 61 is arranged at the center of the rear end of the output shaft 6 toward the front end of the first transmission shaft 5. The radial holes 62 extend outwardly from the central hole 62 along the radial direction of the output shaft 6 and penetrate the output shaft 6.

[0025] Figure 2A and Figure 2B 3 are a perspective view and a side view, respectively, of a spacer according to an embodiment of the present invention. Figure 3 is a perspective view of a housing of a gerotor hydraulic motor according to an embodiment of the present invention.

[0026] like Figure 1A and Figure 1B As shown in FIG. 1 , the cycloid hydraulic motor according to this embodiment further includes one or more (two in the figure) bearings 7 as the fifth group of components to be cooled. The cycloid hydraulic motor according to this embodiment includes two bearings 7. A spacer 10 is provided between two adjacent bearings 7. Figure 2A and Figure 2BAs shown, the spacer 10 is generally annular and has one or more oil leakage holes 101. The oil leakage hole 101 is connected to the oil return hole 82 provided on the housing 8. The oil return hole 82 is connected to the oil return passage 81, and the oil return passage 81 leads to the oil return port or external oil leakage port 92 of the gerotor hydraulic motor, and then the leaked oil can enter the external oil tank. Specifically, the oil return passage 81 extends from the oil return hole 82 through the housing 8, the partition plate 4, the rotor stator pair 3 and the rear cover 9 in sequence. The oil return passage 81 leads to the oil return port or external oil leakage port 92 of the gerotor hydraulic motor, thereby constituting the fourth part of the leakage oil passage. As shown Figure 1A , Figure 1B , Figure 1C and Figure 3 As shown, the outer diameter of the spacer 101 is smaller than the inner diameter of the housing 8, so that a gap 11 is formed between the outer circumferential surface of the spacer 10 and the inner circumferential surface 83 of the housing 8. The oil return hole 82 is aligned with the gap 11. In this way, the plurality of oil drain holes 101 can be connected to the oil return hole 82 through the gap 11.

[0027] Next, we will refer to Figure 1B and Figure 1C Describe the flow path of the leaking oil.

[0028] Under the action of hydraulic pressure, some hydraulic oil leaks from the gap between the rotor stator pair 3 and the partition 4 to the inside of the cycloid hydraulic motor, so that the space between the first transmission shaft 5 and the rotor stator pair 3, the partition 4, the housing 8, and the output shaft 6 constitutes the first part of the leakage oil channel. In addition, some hydraulic oil leaks from the gap between the distribution valve 1 and the distribution plate 2, and the gap between the distribution plate 2 and the rotor stator pair 3 to the inside of the cycloid hydraulic motor, so that the space between the second transmission shaft 12 and the distribution valve 1, the distribution plate 2, and the rotor stator pair 3 constitutes the fifth part of the leakage oil channel. The center hole 61 and the radial hole 62 constitute the second part of the leakage oil channel. The oil drain hole 101 and the oil return hole 82 constitute the third part of the leakage oil channel.

[0029] like Figure 1B As shown, the leakage oil flows forward along the first and fifth parts of the leakage oil passage, thereby cooling the second, third and fourth groups of components to be cooled. The leakage oil flows further forward and cools the first group of components to be cooled, and then flows into the second part of the leakage oil passage.

[0030] The leakage oil from the second portion of the leakage oil passage can pass through or penetrate the gap of the bearing 7 itself, thereby cooling the bearing 7 as the fifth group of components to be cooled, and then enter the third portion of the leakage oil passage.

[0031] The leakage oil from the third portion of the leakage oil passage enters the oil return passage 81 and further flows toward the external oil tank.

[0032] In this way, by guiding the hydraulic oil leaking from the housing of the gerotor hydraulic motor to flow through a specially designed flow path (i.e., an internal cooling circuit), the heat generated by the friction of parts inside the housing of the gerotor hydraulic motor is taken away, thereby achieving the technical purpose of the present invention.

[0033] The above describes a typical structure and cooling circuit of a gerotor hydraulic motor according to an embodiment of the present invention. It should be understood that the design of the cooling circuit can be changed accordingly according to the structure of the gerotor hydraulic motor.

[0034] For example, the gerotor hydraulic motor may not have the second transmission shaft 12, the valve plate 2, the valve valve 1, etc. In addition, the gerotor hydraulic motor may not have the spacer 10 as long as the leaking oil can be properly discharged to the outside of the housing 8. In addition, Figure 1A and Figure 1B What is shown in the figure is that the oil return port or the external oil leakage port 92 for the leaked oil is arranged on the rear cover 9. In fact, the oil return port or the external oil leakage port 92 for the leaked oil can also be arranged at other parts of the cycloid hydraulic motor.

[0035] in addition, Figure 2A and Figure 2B 1 shows a case where the outer diameter of the spacer 10 is smaller than the inner diameter of the housing 8 as a whole. However, in another embodiment, the outer diameter of only a portion of the outer circumferential surface of the spacer 10 may be smaller than the inner diameter of the housing 8.

[0036] Specifically, Figure 4A and Figure 4B They are respectively a stereoscopic view and a side view of a spacer according to another embodiment of the present invention. In this embodiment, the outer diameter of only a portion of the outer circumference of the spacer 10' (i.e., the middle portion in the axial direction) is smaller than the inner diameter of the housing 8. Other relevant structures of the spacer 10' are basically the same as those of the embodiment described above. In other words, an oil guide groove 102 is formed on the outer circumference of the spacer 10'. The oil return hole 82 on the housing 8 is aligned with the oil guide groove 102. In this way, even if the spacer 10' abuts against the oil return hole 82, the oil return hole 82 will not be blocked, and the multiple oil drain holes 101 of the spacer 10' can still be connected to the oil return hole 82 through the oil guide groove 102.

[0037] The technical objectives, technical solutions and technical effects of the present invention are described in detail with reference to specific embodiments. It should be understood that the above embodiments are exemplary only and not restrictive. Within the spirit and principles of the present invention, any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art are included in the protection scope of the present invention.

Claims

1. A gerotor hydraulic motor, comprising a rotor-stator pair and one or more groups of components to be cooled, the gerotor hydraulic motor further comprising a leakage oil channel, the leakage oil channel guiding hydraulic oil leaked from the axial side of the rotor-stator pair to flow through the components to be cooled to cool the components to be cooled; The cycloid hydraulic motor further comprises an output shaft, a housing, a partition and a first transmission shaft, wherein the partition is arranged between the housing and the rotor-stator pair. The front end of the output shaft protrudes out of the housing, and the rear end of the output shaft is supported by the housing via a bearing and has internal teeth. The front end of the first transmission shaft has external teeth to mesh with the internal teeth of the output shaft, thereby forming a set of components to be cooled. The rear end of the first transmission shaft has external teeth to mesh with the internal teeth of the rotor of the rotor-stator pair, thereby forming a set of components to be cooled. The hydraulic oil leaks from the gap between the rotor-stator pair and the partition plate into the interior of the cycloid hydraulic motor, so that the space between the first transmission shaft and the rotor-stator pair, the partition plate, the housing, and the output shaft constitutes the first part of the leakage oil channel; The output shaft has a central hole and one or more radial holes, the central hole and the one or more radial holes constitute the second part of the leakage oil passage, the central hole is arranged toward the front end of the first transmission shaft and communicates with the first part of the leakage oil passage, and the radial holes extend from the central hole outwardly along the radial direction of the output shaft to a position communicating with the bearing; The bearing comprises at least two bearings and constitutes a group of components to be cooled, A spacer is arranged between two adjacent bearings, the spacer is annular and has one or more oil leakage holes, the oil leakage holes are connected with the oil return holes arranged on the housing, and together constitute the third part of the leakage oil channel, and The third part of the leakage oil passage is connected to the second part of the leakage oil passage through the gap of the bearing itself. in, The spacer has a plurality of oil drain holes, and the outer diameter of the spacer is smaller than the inner diameter of the housing so as to form a gap between the outer circumferential surface of the spacer and the inner circumferential surface of the housing, and the plurality of oil drain holes of the spacer are connected with the oil return holes on the housing through the gap.

2. The gerotor hydraulic motor according to claim 1, wherein: The cycloid hydraulic motor also includes a rear cover, the housing, the partition, the rotor-stator pair and the rear cover are connected together in sequence, the leakage oil channel also includes an oil return channel, the oil return channel extends from the oil return hole through the housing, the partition, the rotor-stator pair and the rear cover in sequence, the oil return channel leads to the oil return port or the external oil leakage port of the cycloid hydraulic motor, and constitutes the fourth part of the leakage oil channel.

3. The gerotor hydraulic motor according to claim 1, wherein: The cycloid hydraulic motor also includes a distribution plate and a rear cover. The housing, the partition, the rotor-stator pair, the distribution plate and the rear cover are connected together in sequence. The leakage oil channel also includes an oil return channel. The oil return channel extends from the oil return hole through the housing, the partition, the rotor-stator pair, the distribution plate and the rear cover in sequence. The oil return channel leads to the oil return port or the external oil leakage port of the cycloid hydraulic motor, constituting the fourth part of the leakage oil channel.

4. The gerotor hydraulic motor according to claim 1, further comprising a valve plate, a valve and a second transmission shaft. in, The distribution plate is arranged between the rotor stator pair and the distribution valve. The front end of the second transmission shaft has external teeth to mesh with the internal teeth of the rotor of the rotor-stator pair, thereby forming a set of components to be cooled. The rear end of the second transmission shaft has external teeth to mesh with the internal teeth of the distribution valve, thereby forming a group of components to be cooled. The hydraulic oil leaks from the gap between the distribution valve and the distribution plate, and the gap between the distribution plate and the rotor-stator pair to the inside of the cycloid hydraulic motor, so that the space between the second transmission shaft and the distribution valve, the distribution plate, and the rotor-stator pair constitutes the fifth part of the leakage oil channel, and The first portion and the fifth portion of the leakage oil passage are communicated with each other at the rotor-stator pair.

5. A gerotor hydraulic motor, comprising a rotor-stator pair and one or more groups of components to be cooled, the gerotor hydraulic motor further comprising a leakage oil channel, the leakage oil channel guiding hydraulic oil leaking from the axial side of the rotor-stator pair to flow through the components to be cooled to cool the components to be cooled; The cycloid hydraulic motor further comprises an output shaft, a housing, a partition and a first transmission shaft, wherein the partition is arranged between the housing and the rotor-stator pair. The front end of the output shaft protrudes out of the housing, and the rear end of the output shaft is supported by the housing via a bearing and has internal teeth. The front end of the first transmission shaft has external teeth to mesh with the internal teeth of the output shaft, thereby forming a set of components to be cooled. The rear end of the first transmission shaft has external teeth to mesh with the internal teeth of the rotor of the rotor-stator pair, thereby forming a set of components to be cooled. The hydraulic oil leaks from the gap between the rotor-stator pair and the partition plate into the interior of the cycloid hydraulic motor, so that the space between the first transmission shaft and the rotor-stator pair, the partition plate, the housing, and the output shaft constitutes the first part of the leakage oil channel; The output shaft has a central hole and one or more radial holes, the central hole and the one or more radial holes constitute the second part of the leakage oil passage, the central hole is arranged toward the front end of the first transmission shaft and communicates with the first part of the leakage oil passage, and the radial holes extend from the central hole outwardly along the radial direction of the output shaft to a position communicating with the bearing; The bearing comprises at least two bearings and constitutes a group of components to be cooled, A spacer is arranged between two adjacent bearings, the spacer is annular and has one or more oil leakage holes, the oil leakage holes are connected with the oil return holes arranged on the housing, and together constitute the third part of the leakage oil channel, and The third part of the leakage oil passage is connected to the second part of the leakage oil passage through the gap of the bearing itself. in, The spacer has a plurality of oil drain holes, and an oil guide groove is formed on the outer peripheral surface of the spacer. The plurality of oil drain holes of the spacer are communicated with the oil return hole on the housing through the oil guide groove.

6. The gerotor hydraulic motor according to claim 5, wherein: The cycloid hydraulic motor also includes a rear cover, the housing, the partition, the rotor-stator pair and the rear cover are connected together in sequence, the leakage oil channel also includes an oil return channel, the oil return channel extends from the oil return hole through the housing, the partition, the rotor-stator pair and the rear cover in sequence, the oil return channel leads to the oil return port or the external oil leakage port of the cycloid hydraulic motor, and constitutes the fourth part of the leakage oil channel.

7. The gerotor hydraulic motor according to claim 5, wherein: The cycloid hydraulic motor also includes a distribution plate and a rear cover. The housing, the partition, the rotor-stator pair, the distribution plate and the rear cover are connected together in sequence. The leakage oil channel also includes an oil return channel. The oil return channel extends from the oil return hole through the housing, the partition, the rotor-stator pair, the distribution plate and the rear cover in sequence. The oil return channel leads to the oil return port or the external oil leakage port of the cycloid hydraulic motor, constituting the fourth part of the leakage oil channel.

8. The gerotor hydraulic motor according to claim 5, further comprising a valve plate, a valve and a second transmission shaft. in, The distribution plate is arranged between the rotor stator pair and the distribution valve. The front end of the second transmission shaft has external teeth to mesh with the internal teeth of the rotor of the rotor-stator pair, thereby forming a set of components to be cooled. The rear end of the second transmission shaft has external teeth to mesh with the internal teeth of the distribution valve, thereby forming a group of components to be cooled. The hydraulic oil leaks from the gap between the distribution valve and the distribution plate, and the gap between the distribution plate and the rotor-stator pair to the inside of the cycloid hydraulic motor, so that the space between the second transmission shaft and the distribution valve, the distribution plate, and the rotor-stator pair constitutes the fifth part of the leakage oil channel, and The first portion and the fifth portion of the leakage oil passage are communicated with each other at the rotor-stator pair.

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