Rotor assembly, fluid drive device, and vehicle

Abstract

The application relates to the technical field of vehicles and discloses a rotor assembly, a fluid driving device and a vehicle. Fluid enters a main pressure cavity through a fluid inlet, high-pressure fluid in the main pressure cavity enters a back cavity through a fluid inlet and outlet, the high-pressure fluid in the back cavity acts on a rolling unit in a radial outward direction of a rotor, and an elastic member exerts a force on the rolling unit in the radial outward direction of the rotor, so that the rolling unit and an inner wall of an outer shell are kept in abutment. Since the fluid in the back cavity comes from the fluid in the main pressure cavity formed by the inner wall of the outer shell and the rotor, the fluid in the back cavity changes with the change of the fluid pressure in the main pressure cavity, the abutment force between the rolling unit and the inner wall of the outer shell can be prevented from being too large, the rolling friction between the rolling unit and the inner wall of the outer shell can be prevented from being too large, and the influence of the rolling friction between the rolling unit and the inner wall of the outer shell on the service life and the operation reliability of the fluid driving device is reduced.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a rotor assembly, a fluid drive device, and a vehicle. Background Technology

[0002] A motor is an actuator that converts pressure energy into mechanical energy and performs work. There are several types of motors, including gear motors, screw motors, vane motors, and axial piston motors.

[0003] The vane motor includes a housing and a rotor rotatably disposed within the housing. The outer peripheral wall of the rotor is provided with a plurality of vane slots arranged at intervals along its circumference. Vanes are disposed in the vane slots and are slidably connected to them along the radial direction of the rotor. A spring is also disposed in the vane slot. One end of the vane is rotatably connected to a rolling element. The rolling element extends at least partially out of the vane slot and abuts against the inner wall of the housing under the action of the spring. During the rotation of the rotor, there is rolling friction between the rolling element and the inner wall of the housing, which results in low friction and low heat loss.

[0004] However, in actual application, it was found that when the rolling element rotates to the vicinity of the oil inlet on the outer shell, the high pressure of the oil near the oil inlet is the greatest, and the radial force of the high pressure oil applied to the rolling element toward the rotor center is the greatest. Under the action of the high pressure oil, the rolling element may overcome the spring force and move closer to the rotor center radially along the rotor, thereby making the sealing effect between the rolling element and the inner wall of the outer shell worse.

[0005] Although a spring that can provide greater force can be selected to ensure that the rolling elements always maintain close contact with the inner wall of the housing, this will undoubtedly result in a larger force between the rolling elements and the inner wall of the housing when the oil pressure of the high-pressure oil is low. This leads to an increase in the rolling friction between the rolling elements and the inner wall of the housing during rotor rotation, thereby generating a large amount of heat and energy loss, which in turn affects the service life and operational reliability of the motor. Summary of the Invention

[0006] The purpose of this invention is to provide a rotor assembly, a fluid drive device, and a vehicle that can reduce frictional losses, extend the service life of the fluid drive device, and improve the operational reliability of the fluid drive device.

[0007] To achieve this objective, in a first aspect, the rotor assembly provided by the present invention includes:

[0008] Rotor;

[0009] A rolling unit is movably connected to the outer periphery of the rotor radially. The rolling unit includes a rolling element rotatable relative to the rotor, the rolling element extending at least partially outward along the radial direction of the rotor. A back cavity is formed between the rolling unit and the rotor on the side near the rotor's central axis. The back cavity has a fluid inlet and outlet located on the circumferential side of the rolling element on the rotor. The fluid inlet and outlet are used to connect the main pressure chamber between the housing of the fluid drive device and the rotor. Pressurized fluid in the back cavity can apply a radially outward force to the rolling unit.

[0010] An elastic element, corresponding to each of the rolling units, is disposed between the rotor and the corresponding rolling unit. The elastic element is used to apply a radially outward force to the rolling unit along the rotor.

[0011] As one feasible technical solution for the above-mentioned rotor assembly, the rolling unit further includes a bracket that is movably and sealingly connected to the outer periphery of the rotor along the radial direction of the rotor, and the bracket is rotatably connected to one of the rolling elements at each end of the rotor in the circumferential direction.

[0012] The sealing position where the bracket is sealed to the rotor is located between the two rolling elements along the circumference of the rotor, and the sealing position forms a back cavity on each side of the rotor circumference.

[0013] As one feasible technical solution for the above-mentioned rotor assembly, the bracket is provided with a one-way valve, and the rolling unit forms a secondary pressure chamber on the side opposite to the rotor along the radial direction of the rotor. The secondary pressure chamber is located between the two rolling elements of the rolling unit along the circumference of the rotor. The one-way valve enables the secondary pressure chamber to communicate unidirectionally with one of the back chambers.

[0014] As one feasible technical solution for the above-mentioned rotor assembly, the outer peripheral wall of the rotor is provided with a fluid groove, and the back cavity is formed radially between the rolling unit and the bottom wall of the fluid groove.

[0015] As one feasible technical solution for the above-mentioned rotor assembly, the rolling unit is at least partially located within the fluid groove, and the fluid inlet and outlet are disposed between the rolling unit and the inner wall of the fluid groove along the circumferential direction of the rotor;

[0016] Alternatively, the fluid inlet and outlet may be located on the support;

[0017] Alternatively, the fluid inlet and outlet may be located on the rotor.

[0018] As one feasible technical solution for the above-mentioned rotor assembly, one of the support and the bottom wall of the fluid tank is provided with an installation groove, and the other is provided with an installation part. The installation part and the installation groove are sealed and connected by a sealing member. The sealing member is movably disposed in the installation groove along the radial direction of the rotor.

[0019] As one feasible technical solution for the aforementioned rotor assembly, the seal is rotatably disposed within the mounting groove, and the seal is hinged to the mounting portion.

[0020] As one feasible technical solution for the aforementioned rotor assembly, the elastic element is radially and retractably disposed between the seal and the bottom wall of the mounting groove.

[0021] As one feasible technical solution for the above-mentioned rotor assembly, the rotor is provided with a displacement adjustment hole, one end of which extends through to the outer peripheral wall of the rotor.

[0022] The rotor assembly further includes a displacement regulating unit, which includes:

[0023] A plunger, one end of which is axially movably sealed within the displacement adjustment hole;

[0024] A drive module is used to drive the plunger to move axially along the displacement adjustment hole.

[0025] As one feasible technical solution for the aforementioned rotor assembly, the drive module includes:

[0026] An elastic reset element is used to give the plunger a tendency to move axially toward the rotor center axis along the displacement adjustment hole.

[0027] An adjusting shaft is movably inserted through the rotor along the rotor axis. The adjusting shaft has a displacement adjusting surface. The other end of the plunger abuts against the adjusting surface along the displacement adjusting hole axis. The distance between the adjusting surface and the central axis of the adjusting shaft gradually increases from one end to the other along the direction of the adjusting shaft axis.

[0028] As one feasible technical solution for the above-mentioned rotor assembly, multiple displacement adjustment units are provided, and the multiple displacement adjustment units are arranged at intervals along the circumference of the rotor.

[0029] The adjusting shaft has a plurality of adjusting surfaces that are sequentially connected along its circumference, and the plurality of adjusting surfaces are arranged in a one-to-one correspondence with the plurality of displacement adjusting units.

[0030] As one feasible technical solution for the above-mentioned rotor assembly, at least one displacement adjustment unit is provided between two adjacent rolling units.

[0031] In a second aspect, the fluid drive device provided by the present invention includes a housing and a rotor assembly as described in any of the above-described embodiments; the rotor assembly is rotatably disposed within the housing about its own axis, a main pressure chamber is formed between the outer wall of the rotor and the inner wall of the housing, and the rolling element abuts against the inner wall of the housing;

[0032] The outer casing is provided with at least one pair of fluid ports, and the volume of the main pressure chamber between the two fluid ports of each pair of fluid ports tends to increase along the rotation direction of the rotor, or tends to increase first and then decrease.

[0033] Each pair of fluid ports has a fluid inlet and a fluid outlet, and the fluid inlet and outlet are connected to the main pressure chamber that is connected to the fluid inlet.

[0034] As one feasible technical solution for the aforementioned fluid drive device, the fluid drive device includes a motor or a turbine.

[0035] As one feasible technical solution of the above-mentioned fluid drive device, the rolling unit further includes a bracket, and the bracket is rotatably connected to each of the rolling elements at both ends of the rotor in the circumferential direction; a back cavity is formed on each side of the sealing position where the rolling unit is sealed to the rotor; the two back cavities are respectively a first back cavity and a second back cavity that are spaced apart along a preset direction, the preset direction being the rotor rotation direction from one end of the bracket to the other end of the bracket;

[0036] The two rolling elements of the rolling unit abut against the inner wall of the housing, so that a secondary pressure chamber is formed between the rolling unit and the inner wall of the housing. The bracket is provided with a one-way valve, which can unidirectionally connect the secondary pressure chamber with the second back chamber.

[0037] As one feasible technical solution of the above-mentioned fluid drive device, the intersection line between the inner wall of the outer shell and the first preset plane is elliptical, and the first preset plane is perpendicular to the central axis of the rotor; the two fluid ports of each pair of fluid ports are respectively arranged on both sides of the second preset plane, and are both located on the same side of the third preset plane; the plane containing the central axis of the rotor and the major axis of the ellipse is the second preset plane, and the plane containing the central axis of the rotor and the minor axis of the ellipse is the third preset plane;

[0038] The intersection of the central axis of the fluid port and the inner wall of the outer casing is a preset intersection point, and the shortest line connecting the preset intersection point and the central axis of the rotor is a preset connecting line; the two preset connecting lines corresponding to each pair of fluid ports are perpendicular and symmetrically arranged about the second preset plane.

[0039] As one feasible technical solution for the aforementioned fluid drive device, the fluid port is provided in two pairs, with the two fluid inlets located on both sides of the second preset plane.

[0040] Thirdly, the vehicle provided by the present invention includes the fluid drive device described in any of the above embodiments.

[0041] The present invention has at least the following beneficial effects:

[0042] The rotor assembly provided by this invention includes a back cavity formed between the rolling element and the rotor on the side of the rolling element closest to the rotor's central axis. The back cavity has fluid inlets and outlets located on the circumferential side of the rolling element. These fluid inlets and outlets connect to the main pressure chamber between the housing and the rotor of the fluid drive device. Pressurized fluid within the back cavity applies a radially outward force to the rolling element. Fluid enters the main pressure chamber through the fluid inlet, and high-pressure fluid from the main pressure chamber enters the back cavity through the fluid inlet and outlet. The radially outward force applied to the rolling element by the high-pressure fluid in the back cavity, along with the radially outward force applied to the rolling element by the elastic element, ensures that the rolling element and the inner wall of the housing remain in contact. Since the fluid in the back cavity originates from the fluid within the main pressure chamber formed by the inner wall of the housing and the rotor, the fluid in the back cavity changes with the pressure of the fluid in the main pressure chamber. This prevents excessive contact force between the rolling element and the inner wall of the housing, thus avoiding excessive rolling friction and reducing the impact of rolling friction on the service life and operational reliability of the fluid drive device.

[0043] The fluid drive device provided by the present invention includes the aforementioned rotor assembly, which connects the main pressure chamber between the inner wall of the housing and the rotor to the back cavity. Fluid in the main pressure chamber between the inner wall of the housing and the rotor is introduced into the back cavity. The high-pressure fluid in the back cavity acts on the rolling element with a radial outward force along the rotor, and the elastic element applies a radial outward force to the rolling element, so that the rolling element and the inner wall of the housing always remain in contact and the force between them is not too large. This ensures the sealing performance between the rolling element and the inner wall of the housing, while reducing the impact of rolling friction between the rolling element and the inner wall of the housing on the service life and operational reliability of the fluid drive device.

[0044] The vehicle provided by the present invention includes the above-mentioned fluid drive device and has the advantages of long service life and high operational reliability. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0046] Figure 1 A cross-sectional view of a motor provided in an embodiment of the present invention;

[0047] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle;

[0048] Figure 3 This is a cross-sectional view of the rolling unit provided in an embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of the first type of rolling unit provided in the embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the structure of the second type of rolling unit provided in an embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram of the structure of the third type of rolling unit provided in the embodiments of the present invention;

[0052] Figures 7 to 10 This is a process diagram of the motor's fluid intake and exhaust provided in an embodiment of the present invention;

[0053] Figure 11 This is a schematic diagram of the connection between the adjusting shaft and the plunger provided in an embodiment of the present invention.

[0054] In the picture:

[0055] 1. Rotor; 11. Displacement adjustment hole; 12. Mounting part; 121. Rotating shaft;

[0056] 2. Rolling unit; 2a. First rolling unit; 2b. Second rolling unit; 2c. Third rolling unit; 2d. Fourth rolling unit; 21. Bracket; 211. Mounting groove; 2111. First groove; 2112. Second groove; 22. Rolling element; 22a. First rolling element; 22b. Second rolling element; 23. Rotating shaft;

[0057] 3. Elastic components;

[0058] 4. Sealing components;

[0059] 51. Plunger; 52. Elastic return element; 53. Adjusting shaft; 531. Adjusting surface; 54. Roller;

[0060] 6. Outer casing; 61. Fluid inlet; 62. Fluid outlet;

[0061] 7. Output shaft;

[0062] 8. Check valve;

[0063] 10. Fluid inlet / outlet; 20. Back cavity; 20a. First back cavity; 20b. Second back cavity; 30. Secondary pressure cavity; 40. Main pressure cavity;

[0064] 100, Second preset plane; 200, Third preset plane. Detailed Implementation

[0065] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0066] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0069] The present invention provides a rotor assembly and a fluid drive device using the rotor assembly. The fluid drive device can be a motor, a turbine, or other machine that uses fluid drive to convert mechanical energy. The rotor assembly and the motor using the rotor assembly are described below as an example.

[0070] like Figures 1 to 3 As shown, the motor includes a rotor assembly and a housing 6. The rotor assembly is rotatably disposed within the housing 6 about its own axis. The rotor assembly includes a rotor 1, a rolling element 2, and an elastic element 3. A main pressure chamber 40 is formed between the outer wall of the rotor 1 and the inner wall of the housing 6. The rolling element 2 includes a bracket 21, which is movably and sealingly connected to the outer periphery of the rotor 1 radially. The bracket 21 is rotatably connected to a rolling element 22, which extends at least partially outward from the rotor 1 radially, abutting against the inner wall of the housing 6. The elastic element 3 is disposed between the rotor 1 and the corresponding rolling element 2, and is used to apply a radially outward force to the rolling element 22. Exemplarily, the elastic element 3 is a spring, the rolling element 22 is a roller, and the bracket 21 is rotatably connected to the rolling element 22 via a shaft 23. It should be noted that the radially outward direction of the rotor 1 refers to the direction away from the central axis of the rotor 1.

[0071] The outer casing 6 is provided with at least one pair of fluid ports, and the volume of the main pressure chamber 40 between the two fluid ports in each pair tends to increase first and then decrease along the rotation direction of the rotor 1. It should be noted that one of the two fluid ports in each pair is a fluid inlet 61 and the other is a fluid outlet 62.

[0072] For example, the intersection line between the inner wall of the outer casing 6 and the first preset plane is elliptical. The first preset plane is perpendicular to the central axis of the rotor 1. The two fluid ports of each pair of fluid ports are respectively arranged on both sides of the second preset plane 100 and on the same side of the third preset plane 200. The plane containing the central axis of the rotor 1 and the major axis of the ellipse is the second preset plane 100, and the plane containing the central axis of the rotor 1 and the minor axis of the ellipse is the third preset plane 200.

[0073] This causes the volume of the main pressure chamber 40 between the fluid inlet 61 and the fluid outlet 62 of each pair of fluid ports to gradually increase and then gradually decrease along the rotation direction of the rotor 1.

[0074] Multiple rolling units 2 are provided, arranged at intervals along the circumference of the rotor 1, and each rolling unit 2 corresponds to a multiple elastic element 3. For example, four rolling units 2 are provided, evenly distributed along the circumference of the rotor 1. With the rolling elements 22 of two adjacent rolling units in contact with the inner wall of the outer casing 6, when high-pressure fluid is introduced through the fluid inlet 61, the change in volume between the fluid inlet 61 and the fluid outlet 62 causes the rotor 1 to generate torque and rotate under the action of the pressure difference. It should be noted that the number of rolling units 2 is not limited to four; it can also be one, two, three, five, or more. When one rolling unit 2 is set, taking one fluid inlet 61 and one fluid outlet 62 as an example, the intersection of fluid inlet 61 and the inner wall of the outer shell 6 is A, and the intersection of fluid outlet 62 and the inner wall of the outer shell 6 is B. The line connecting points A and B divides the inner cavity of the outer shell 6 into two chambers, namely the first chamber and the second chamber. The inner wall of the first chamber is projected as a circular arc coaxial with the rotor 1 on a plane perpendicular to the central axis of the rotor 1. The inner wall of the second chamber is projected as part of an ellipse on a plane perpendicular to the central axis of the rotor 1. The rotation of the rotor 1 is achieved by the cooperation of the second chamber, the rolling unit 2, and the rotor 1. The outer peripheral wall of the rotor 1 and the inner wall of the first chamber rotate and cooperate, avoiding the gap between the outer peripheral wall of the rotor 1 and the inner wall of the first chamber from causing the fluid inlet 61 and the fluid outlet 62 to connect.

[0075] Specifically, high-pressure fluid enters the main pressure chamber 40 through fluid inlet 61. As the volume of the main pressure chamber 40 between fluid inlet 61 and fluid outlet 62 gradually increases along the rotation direction of rotor 1, the contact area between the high-pressure fluid and rotor 1 gradually increases, and the pressure on rotor 1 gradually increases. This facilitates the generation of torque through the pressure difference at different parts of rotor 1, causing rotor 1 to rotate. As rotor 1 continues to rotate, the volume of the main pressure chamber 40 gradually decreases. When the volume of the main pressure chamber 40 begins to decrease, fluid begins to be discharged from the main pressure chamber 40 through fluid outlet 62.

[0076] During the rotation of rotor 1, as the volume of main pressure chamber 40 changes, under the combined action of elastic element 3 and inner wall of outer shell 6, rolling element 22 moves radially back and forth along rotor 1, so that rolling element 22 always abuts against inner wall of outer shell 6, so that the main pressure chambers 40 on both sides of rolling element 22 are not connected, and rolling element 22 and inner wall of outer shell 6 roll into contact, and the friction between rolling element 22 and inner wall of outer shell 6 is small.

[0077] For ease of description, the two fluid ports are designated as the first fluid port and the second fluid port, respectively. When the first fluid port is used as the fluid inlet 61 and the second fluid port as the fluid outlet 62, after high-pressure fluid is introduced into the first fluid port, the rotor 1 rotates along the first circumferential direction. Along the rotation direction of the rotor 1, the volume of the main pressure chamber 40 between the fluid inlet 61 and the fluid outlet 62 gradually increases and then gradually decreases, enabling the two fluid ports to switch directions. That is, when the first fluid port is used as the fluid outlet 62 and the second fluid port is used as the fluid inlet 61, after high-pressure fluid is introduced into the second fluid port, the rotor 1 rotates along the second circumferential direction, and the directions of the first and second circumferential directions are opposite. In this way, the motor is made into a bidirectional motor.

[0078] In other embodiments, the volume of the main pressure chamber 40 between the two fluid ports may tend to increase along the rotation direction of the rotor 1, in which case the motor is a unidirectional motor. Other methods may also be used to make the volume of the main pressure chamber 40 between the two fluid ports tend to first increase and then decrease along the rotation direction of the rotor 1, such as by creating grooves on the inner wall of the outer casing 6 between the two fluid ports.

[0079] For example, the intersection of the central axis of the fluid port and the inner wall of the outer casing 6 is a preset intersection point, and the shortest line connecting the preset intersection point and the central axis of the rotor 1 is a preset connecting line; the two preset connecting lines corresponding to each pair of fluid ports are perpendicular and symmetrically arranged about the second preset plane 100. There are two pairs of fluid ports, and the two pairs of fluid ports are symmetrical about the third preset plane 200. In other words, the angle between the preset connecting line corresponding to each fluid port and the major axis of the ellipse is 45°. It should be noted that the preset connecting line is perpendicular to the central axis of the rotor 1.

[0080] Two fluid inlets 61 are located on opposite sides of the second preset plane 100, and correspondingly, two fluid outlets 62 are located on opposite sides of the second preset plane 100. When high-pressure fluid is simultaneously introduced into the two fluid inlets 61, the rotor 1 can rotate smoothly under the force of the high-pressure fluid, ensuring that the rotor assembly is always subjected to an unbalanced torque, causing the rotor assembly to rotate around its own central axis under this torque. Through the cooperation of four rolling units 2 with the two pairs of fluid inlets, the rotor 1 rotates 180°, and each pair of fluid inlets performs a fluid inlet and outlet process once.

[0081] When the rolling element 22 rotates to the vicinity of the fluid inlet 61, the pressure of the high-pressure fluid near the fluid inlet 61 is the greatest, and the force exerted by the high-pressure fluid on the rolling element 22 toward the center of the rotor 1 is the greatest. Under the action of the high-pressure fluid, the rolling element 22 may overcome the force of the elastic element 3 and move radially toward the center of the rotor 1, thereby making the sealing effect between the rolling element 22 and the inner wall of the outer casing 6 worse.

[0082] In view of this, in the rotor assembly provided by the embodiment of the present invention, a back cavity 20 is formed between the side of the rolling unit 2 near the central axis of the rotor 1 and the rotor 1. The back cavity 20 has a fluid inlet and outlet 10 located on the circumferential side of the rolling element 22 on the rotor 1. The fluid inlet and outlet 10 is used to connect the main pressure chamber 40 between the motor housing 6 and the rotor 1. The pressurized fluid in the back cavity 20 can apply a radially outward force to the rolling unit 2, so that the rolling element 22 always remains in contact with the inner wall of the housing 6.

[0083] Specifically, along the circumference of the rotor 1, the fluid inlet and outlet 10 are located between two adjacent rolling units 2, and the fluid inlet and outlet 10 can communicate with the main pressure chamber 40 which is connected to the fluid inlet 61.

[0084] Fluid enters the main pressure chamber 40 through fluid inlet 61. The high-pressure fluid in the main pressure chamber 40 enters the back chamber 20 through fluid inlet / outlet 10. The high-pressure fluid in the back chamber 20 exerts a radial outward force on the rolling element 2 along the rotor 1, and the elastic element 3 exerts a radial outward force on the rolling element 22 along the rotor 1, keeping the rolling element 22 in contact with the inner wall of the housing 6. Since the fluid in the back chamber 20 comes from the fluid in the main pressure chamber 40 formed by the inner wall of the housing 6 and the rotor 1, the fluid in the back chamber 20 changes with the fluid pressure in the main pressure chamber 40. This avoids excessive contact force between the rolling element 22 and the inner wall of the housing 6, thus preventing excessive rolling friction between the rolling element 22 and the inner wall of the housing 6 and reducing the impact of rolling friction between the rolling element 22 and the inner wall of the housing 6 on the service life and operational reliability of the motor.

[0085] Compared to traditional motors, the motor provided in this embodiment of the invention has a larger output torque and less friction loss due to friction between the rolling element 22 and the inner wall of the housing 6, making it suitable for most engineering machinery and special machinery with high-speed and high-torque operating conditions.

[0086] For example, the outer peripheral wall of the rotor 1 is provided with a fluid groove, the rolling unit 2 is at least partially located in the fluid groove, and the back cavity 20 is formed radially between the rolling unit 2 and the bottom wall of the fluid groove, so that the fluid in the back cavity 20 can exert a radially outward force on the rolling unit 2.

[0087] Along the circumference of rotor 1, fluid inlet / outlet 10 is disposed between the rolling unit 2 and the inner wall of the fluid tank, allowing fluid in the main pressure chamber 40 to enter the back chamber 20 through fluid inlet / outlet 10. In other embodiments, fluid inlet / outlet 10 can also be provided on rotor 1, with one end of fluid inlet / outlet 10 extending to the outer peripheral wall of rotor 1 and the other end extending to the inner wall of fluid tank; fluid inlet / outlet 10 can also be provided on bracket 21. Alternatively, bracket 21 can be omitted, and rolling element 22 can be rotatably disposed in fluid tank and sealed to the inner wall of fluid tank, in which case fluid inlet / outlet 10 can be provided on rotor 1.

[0088] In some embodiments, such as Figures 1 to 3 As shown, the rolling unit 2 is sealed to the rotor 1. This configuration ensures that even after the fluid inlet and outlet 10 are set, the rolling unit 2 can still separate the high-pressure fluid and low-pressure fluid on both sides, guaranteeing the normal operation of the motor.

[0089] For example, the rolling unit 2 includes two rolling elements 22, one of which is rotatably connected to one end of the bracket 21 circumferentially connected to the rotor 1, and the other rolling element 22 is rotatably connected to the other end of the bracket 21 circumferentially connected to the rotor 1. The bracket 21 is rotatably connected to the rotor 1, and the sealing position of the bracket 21 and the rotor 1 is located between the two rolling elements 22 along the circumferential direction of the rotor 1, and the sealing position forms a back cavity 20 on each side of the rotor 1. The intersection line between the inner wall of the outer casing 6 and the first preset plane is elliptical. When the rolling element 22 rotates with the rotor 1 to the vicinity of the fluid inlet 61, by rotatably connecting the bracket 21 to the rotor 1, the bracket 21 can rotate relative to the rotor 1, thereby allowing the rolling element 22 to remain in contact with the inner wall of the outer casing 6.

[0090] In other embodiments, such as Figure 4 As shown, a bracket 21 can also be rotatably connected to a rolling element 22. A fluid inlet / outlet 10 can be provided on the bracket 21, allowing the fluid inlet / outlet 10 to communicate with the main pressure chamber 40, which is connected to the fluid inlet 61. This allows the high-pressure fluid in the main pressure chamber 40 to enter the back cavity 20, ensuring that the rolling element 22, located near the fluid inlet / outlet 10, remains in contact with the inner wall of the outer casing 6. For the scheme where a bracket 21 is rotatably connected to a rolling element 22, as shown... Figure 5As shown, the fluid inlet / outlet 10 can also be located between the circumferential outer wall of the support 21 and the circumferential side wall of the fluid tank. A groove extending radially through the rotor 1 is formed on the outer wall of the support 21. The opening of the groove on the circumferential outer wall of the support 21 is blocked by the side wall of the fluid tank, thus forming the fluid inlet / outlet 10 between the circumferential outer wall of the support 21 and the circumferential side wall of the fluid tank. In this case, it is necessary to restrict the rotation of the support 21 relative to the rotor 1 to prevent changes in the position of the groove. Alternatively, the groove can be located on the circumferential side wall of the fluid tank. Alternatively, grooves can be simultaneously provided on both the circumferential side wall of the fluid tank and the circumferential outer wall of the support 21. Figure 6 As shown, the fluid inlet and outlet 10 can also be located on the rotor 1.

[0091] For ease of description, the two rolling elements 22 are referred to as the first rolling element 22a and the second rolling element 22b, respectively. The first rolling element 22a and the second rolling element 22b are distributed at intervals along a preset direction, which is the rotation direction of the rotor 1 from one end of the support 21 to the other end of the support 21. Along the circumference of the rotor 1, a fluid inlet / outlet 10 is formed between the rolling unit 2 and one side inner wall of the fluid tank, referred to as the first fluid inlet / outlet. Along the circumference of the rotor 1, a fluid inlet / outlet 10 is formed between the rolling unit 2 and the other side inner wall of the fluid tank, referred to as the second fluid inlet / outlet. The first fluid inlet / outlet corresponds to the first rolling element 22a, and the second fluid inlet / outlet corresponds to the second rolling element 22b. The two back cavities 20 on both sides of the sealing position are the first back cavity 20a and the second back cavity 20b, respectively. The first back cavity 20a corresponds to the first rolling element 22a, and the second back cavity 20b corresponds to the second rolling element 22b.

[0092] The two rolling elements 22 of each rolling unit 2 are in contact with the inner wall of the outer casing 6. The side of the rolling unit 2 facing away from the rotor 1 along the radial direction of the rotor 1 and the inner wall of the outer casing 6 form a secondary pressure chamber 30. The secondary pressure chamber 30 is located between the two rolling elements 22 of the same rolling unit 2.

[0093] The following is combined Figures 7 to 10 The working process of the motor using the above-mentioned rotor assembly will be described in detail. For ease of description, the following will be used: Figure 7 The rolling unit 2 located directly above is denoted as the first rolling unit 2a, along... Figures 7 to 10 In the counterclockwise direction shown, the other three rolling units 2 are respectively designated as the second rolling unit 2b, the third rolling unit 2c, and the fourth rolling unit 2d. Figure 7 The fluid inlet 61 and fluid outlet 62 on the left side are the first fluid inlet and the first fluid outlet, respectively. Figure 7 The fluid inlet 61 on the right side is the second fluid inlet.

[0094] like Figure 7As shown, high-pressure fluid enters the main pressure chamber 40 between the first rolling unit 2a and the second rolling unit 2b through the first fluid inlet. The high-pressure fluid in the main pressure chamber 40 enters the first back cavity 20a corresponding to the first rolling unit 2a through the first fluid inlet and outlet of the first rolling unit 2a, and simultaneously enters the second back cavity 20b corresponding to the second rolling unit 2b through the second fluid inlet and outlet of the second rolling unit 2b. The volume of the secondary pressure chamber 30 and the first back cavity 20a corresponding to the first rolling unit 2a gradually increases, the contact area between the high-pressure fluid and the rotor 1 gradually increases, and the pressure on the rotor 1 gradually increases.

[0095] Rotor 1 rotates counterclockwise under the impetus of the high-pressure fluid introduced through the first fluid inlet and the second fluid inlet.

[0096] When the secondary pressure chamber 30 corresponding to the first rolling unit 2a is connected to the first fluid inlet, high-pressure fluid enters the secondary pressure chamber 30 corresponding to the first rolling unit 2a. For example... Figure 8 As shown, the second rolling element 22b of the first rolling unit 2a partially crosses the first fluid inlet, so that when the first fluid inlet and the secondary pressure chamber 30 corresponding to the first rolling unit 2a are separated, the secondary pressure chamber 30 is completely filled with fluid. At this time, the main pressure chamber 40 between the second rolling unit 2b and the first rolling unit 2a is connected to the first fluid outlet, and the fluid in the second back cavity 20b corresponding to the second rolling unit 2b and the fluid in the first back cavity 20a corresponding to the first rolling unit 2a are discharged through the first fluid outlet.

[0097] When the secondary pressure chamber 30 corresponding to the first rolling unit 2a is connected to the first fluid outlet, the fluid in the secondary pressure chamber 30 is discharged through the first fluid outlet. For example... Figure 9 As shown, the first rolling element 22a of the fourth rolling unit 2d partially crosses the first fluid inlet, so that when the first fluid inlet and the second back cavity 20b corresponding to the first rolling unit 2a are separated, the fluid inlet of the second back cavity 20b is completed.

[0098] like Figure 10 As shown, when the second rolling element 22b of the first rolling unit 2a passes over the first fluid outlet, the secondary pressure chamber 30 is disconnected from the first fluid inlet and the secondary pressure chamber 30 corresponding to the first rolling unit 2a. At this time, the rotor 1 rotates 90° to complete one fluid inlet and outlet process. The rotor 1 rotates continuously during the continuous fluid inlet and outlet process.

[0099] In some embodiments, one of the support 21 and the bottom wall of the fluid tank is provided with a mounting groove 211, and the other is provided with a mounting part 12. The mounting part 12 is sealed to the sealing member 4, and the sealing member 4 is movably disposed in the mounting groove 211 along the radial direction of the rotor 1.

[0100] For example, the mounting groove 211 is disposed on the bracket 21, the mounting part 12 protrudes from the bottom wall of the fluid tank, and the sealing member 4 is slidably disposed in the mounting groove 211 along the radial direction of the rotor 1. In other embodiments, the mounting groove 211 may be disposed on the rotor 1, and the mounting part 12 may be disposed on the bracket 21.

[0101] This configuration ensures that the two back cavities 20 on both sides of the seal 4 are not connected. Even if the first back cavity 20a is connected to the first fluid outlet and the second back cavity 20b is connected to the first fluid inlet, the rotor 1 can still rotate normally.

[0102] In some embodiments, the seal 4 is rotatably disposed within the mounting groove 211, and the seal 4 is hinged to the mounting portion 12. This ensures that during the rotation of the bracket 21 relative to the rotor 1, the two back cavities 20 on both sides of the seal 4 remain disconnected.

[0103] In some embodiments, the elastic element 3 is radially extendable and retractable between the seal 4 and the bottom wall of the mounting groove 211.

[0104] Specifically, the mounting groove 211 includes a first groove 2111 and a second groove 2112. The first groove 2111 is located on the side of the support 21 facing the center of the rotor 1, and the second groove 2112 is located on the bottom wall of the first groove 2111. The sealing element 4 is a bearing bush, which has a hemispherical shell structure. The outer circumferential surface of the bearing bush is in close contact with the inner wall of the first groove 2111. The bearing bush is slidably disposed in the first groove 2111 along the radial direction of the rotor 1. The mounting part 12 and the mounting groove 211 are sealed and connected by the bearing bush. The elastic element 3 is sandwiched between the bottom wall of the bearing bush and the second groove 2112 along the radial direction of the rotor 1. The mounting part 12 is provided with a rotating shaft 121. The bearing bush is rotatably covered by the rotating shaft 121, so as to realize the hinge connection between the mounting part 12 and the bearing bush.

[0105] During the radial reciprocating movement of the bracket 21 along the rotor 1, the seal 4 is pressed against the rotating shaft 121 by the elastic element 3, and the bracket 21 slides axially relative to the seal 4, keeping the back cavities 20 on both sides of the seal 4 in a non-communicating state. During the reciprocating rotation of the bracket 21 relative to the rotor 1, the seal 4 rotates with the bracket 21 relative to the rotor 1, keeping the back cavities 20 on both sides of the seal 4 in a non-communicating state.

[0106] In some embodiments, the bracket 21 is provided with a one-way valve 8, which enables one-way communication between the secondary pressure chamber 30 and one of the back chambers 20. When the rotor assembly is installed inside the housing 6, the one-way valve 8 unidirectionally connects the secondary pressure chamber 30 and the second back chamber 20b.

[0107] When fluid begins to enter the secondary pressure chamber 30, the fluid pressure inside the secondary pressure chamber 30 gradually increases, causing the force exerted by the fluid inside the secondary pressure chamber 30 on the rolling unit 2 radially inward along the rotor 1 to gradually increase. This is detrimental to maintaining contact between the rolling element 22 and the inner wall of the housing 6. During the process of fluid entering the secondary pressure chamber 30, due to the energy loss of the rotor 1 rotation, the fluid pressure in the second back chamber 20b is lower than the fluid pressure in the first back chamber 20a. After the fluid pressure in the secondary pressure chamber 30 reaches the opening pressure of the one-way valve 8, the one-way valve 8 unidirectionally connects the secondary pressure chamber 30 and the second back chamber 20b, which can prevent the fluid pressure in the secondary pressure chamber 30 from becoming too high. This is beneficial for maintaining contact between the rolling element 22 and the inner wall of the housing 6, and improves the sealing performance of the motor.

[0108] In some embodiments, such as Figure 1 and Figure 11 As shown, the rotor 1 is provided with a displacement adjustment hole 11, one end of which penetrates the outer peripheral wall of the rotor 1; the rotor assembly also includes a displacement adjustment unit, which includes a plunger 51 and a drive module, wherein one end of the plunger 51 is movably sealed in the displacement adjustment hole 11 along the axial direction; the drive module is used to drive the plunger 51 to move along the axial direction of the displacement adjustment hole 11.

[0109] The displacement of the motor can be adjusted by driving the plunger 51 to move axially along the displacement adjustment hole 11 through the drive module. The displacement adjustment hole 11 located between the plunger 51 and the outer peripheral wall of the rotor 1 is connected to the main pressure chamber 40. The displacement of the motor can be adjusted by adjusting the volume of the displacement adjustment hole 11 located between the plunger 51 and the outer peripheral wall of the rotor 1.

[0110] In some embodiments, such as Figure 1 and Figure 11 As shown, the drive module includes a resilient reset member 52 and an adjusting shaft 53. The resilient reset member 52 is used to cause the plunger 51 to tend to move axially towards the central axis of the rotor 1 along the displacement adjusting hole 11. The adjusting shaft 53 is movably inserted into the rotor 1 along the rotor 1 axially and has a displacement adjusting surface 531. The other end of the plunger 51 abuts against the adjusting surface 531 along the displacement adjusting hole 11 axially. The distance between the adjusting surface 531 and the central axis of the adjusting shaft 53 gradually increases from one end of the adjusting shaft 53 to the other end. Exemplarily, the resilient reset member 52 is a spring.

[0111] As the adjusting shaft 53 moves axially and the distance between the adjusting surface 531 and the central axis of the adjusting shaft 53 gradually increases, the adjusting surface 531 will push the plunger 51 to move radially outward along the rotor 1, so that the volume of the displacement adjusting hole 11 located between the plunger 51 and the outer peripheral wall of the rotor 1 gradually decreases, thereby reducing the displacement of the motor. During this process, the elastic reset member 52 is continuously compressed.

[0112] As the adjusting shaft 53 moves axially and the distance between the adjusting surface 531 and the central axis of the adjusting shaft 53 gradually decreases, the plunger 51 will move radially inward along the rotor 1 under the action of the elastic reset member 52, so that the volume of the displacement adjusting hole 11 located between the plunger 51 and the outer peripheral wall of the rotor 1 gradually increases, thereby increasing the displacement of the motor.

[0113] This configuration allows for continuous adjustment of the motor displacement, with a wide range of adjustment options.

[0114] It should be noted that, Figure 11 The arrow in the diagram indicates the direction of movement of the adjusting shaft 53. Figure 11 As the arrow moves from center to right, the motor's displacement gradually increases; along the adjusting shaft 53... Figure 11 As the arrow moves from center to left, the motor's displacement gradually decreases.

[0115] In some embodiments, such as Figure 1 and Figure 11 As shown, multiple displacement adjustment units are provided, and these units are arranged at intervals along the circumference of the rotor 1. The adjustment shaft 53 has multiple adjustment surfaces 531 connected sequentially along its circumference, and each adjustment surface 531 corresponds to one of the multiple displacement adjustment units. In other words, the cross-section of the adjustment shaft 53 perpendicular to its axial direction is polygonal. For example, when there are four rolling units 2, there are correspondingly four displacement adjustment holes 11. The adjustment shaft 53 has four adjustment surfaces 531, and each adjustment surface 531 corresponds to one of the four plungers 51. The cross-section of the adjustment shaft 53 is square, and correspondingly, the adjustment shaft 53 is an oblique quadrangular prism. Two adjacent rolling units 2 are symmetrically arranged about the central axis of the displacement adjustment hole 11 located between them. This arrangement ensures that when the adjustment shaft 53 moves axially to adjust the displacement of the motor, the four plungers 51 move synchronously. The volume of each displacement adjustment hole 11 located radially outside the plunger 51 is equal, thereby achieving torque balance of the rotor assembly, reducing torque pulsation, and achieving high torque and high speed power output. In other embodiments, two adjacent rolling units 2 may also be provided with two, three or more displacement adjustments.

[0116] It should be noted that the axial movement of the adjusting shaft 53 can be adjusted by manual push rod and hydraulic cylinder, which is existing technology in the field and will not be described in detail here.

[0117] In other embodiments, a fluid channel can be opened on the adjusting shaft 53, which is connected to the chamber where the elastic reset member 52 is located. Pressurized fluid is introduced into the chamber where the elastic reset member 52 is located through the fluid channel. The force exerted by the fluid on the plunger 51 pushes the plunger 51 to move radially outward along the rotor 1, and works with the elastic reset member 52 to reset the plunger 51. The pressure of the fluid sent into the chamber where the elastic reset member 52 is located through the fluid channel is adjusted to work with the elastic reset member 52 to make the plunger 51 reciprocate radially along the rotor 1.

[0118] In some embodiments, such as Figure 11 As shown, the plunger 51 and the adjusting shaft 53 are connected by a roller 54, so that rolling friction occurs between the adjusting shaft 53 and the plunger 51 when the adjusting shaft 53 moves axially, thereby reducing the friction between the adjusting shaft 53 and the plunger 51.

[0119] In some embodiments, such as Figure 1 and Figure 11 As shown, the motor's output shaft 7 is connected to the adjusting shaft 53, and the output shaft 7 is used to output power. Exemplarily, the output shaft 7 and the adjusting shaft 53 are splined together.

[0120] In an embodiment of the present invention, the fluid is fed into the main pressure chamber 40 through the fluid inlet 61. The fluid used to drive the rotor assembly to rotate can be high-pressure airflow or high-pressure hydraulic oil, etc., and is not specifically limited here.

[0121] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A rotor assembly, characterized in that, include: Rotor (1); A rolling unit (2) is movably connected to the outer periphery of the rotor (1) radially along the rotor (1). The rolling unit (2) includes a rolling element (22) rotatable relative to the rotor (1). The rolling element (22) extends at least partially outward along the radial direction of the rotor (1). A back cavity (20) is formed between the rolling unit (2) and the rotor (1) on the side near the central axis of the rotor (1). The back cavity (20) has a fluid inlet and outlet (10) located on the circumferential side of the rolling element (22) on the rotor (1). The fluid inlet and outlet (10) are used to communicate with the main pressure chamber (40) between the housing (6) of the fluid drive device and the rotor (1). Pressurized fluid in the back cavity (20) can apply a radial outward force to the rolling unit (2). The elastic element (3) corresponds one-to-one with the rolling unit (2). The elastic element (3) is disposed between the rotor (1) and the corresponding rolling unit (2). The elastic element (3) is used to apply a radially outward force along the rotor (1) to the rolling unit (2).

2. The rotor assembly according to claim 1, characterized in that, The rolling unit (2) further includes a bracket (21) that is movably and sealed to the outer periphery of the rotor (1) along the radial direction of the rotor (1), and the bracket (21) rotatably connects a rolling element (22) to each end of the rotor (1) in the circumferential direction; The sealing position of the bracket (21) and the rotor (1) is located between the two rolling elements (22) along the circumference of the rotor (1), and the sealing position forms a back cavity (20) on each side of the rotor (1) in the circumference direction.

3. The rotor assembly according to claim 2, characterized in that, The bracket (21) is provided with a one-way valve (8). The rolling unit (2) has a secondary pressure chamber (30) formed on the side of the rotor (1) facing away from the rotor (1) along the radial direction. The secondary pressure chamber (30) is located between the two rolling elements (22) of the rolling unit (2) along the circumference of the rotor (1). The one-way valve (8) enables the secondary pressure chamber (30) and one of the back chambers (20) to communicate in one direction.

4. The rotor assembly according to claim 2, characterized in that, The outer peripheral wall of the rotor (1) is provided with a fluid groove, and the back cavity (20) is formed radially between the rolling unit (2) and the bottom wall of the fluid groove.

5. The rotor assembly according to claim 4, characterized in that, The rolling unit (2) is at least partially located within the fluid tank, and the fluid inlet / outlet (10) is disposed between the rolling unit (2) and the inner wall of the fluid tank along the circumference of the rotor (1); Alternatively, the fluid inlet / outlet (10) may be disposed on the bracket (21); Alternatively, the fluid inlet / outlet (10) may be located on the rotor (1).

6. The rotor assembly according to claim 4, characterized in that, Of the bracket (21) and the bottom wall of the fluid tank, one is provided with an installation groove (211) and the other is provided with an installation part (12). The installation part (12) and the installation groove (211) are sealed together by a sealing member (4). The sealing member (4) is movably disposed in the installation groove (211) along the radial direction of the rotor (1).

7. The rotor assembly according to claim 6, characterized in that, The seal (4) is rotatably disposed in the mounting groove (211), and the seal (4) is hinged to the mounting part (12).

8. The rotor assembly according to claim 6, characterized in that, The elastic element (3) is radially and retractably disposed between the seal (4) and the bottom wall of the mounting groove (211) along the rotor (1).

9. The rotor assembly according to any one of claims 1 to 8, characterized in that, The rotor (1) is provided with a displacement adjustment hole (11), one end of which extends through to the outer peripheral wall of the rotor (1); The rotor assembly further includes a displacement regulating unit, which includes: A plunger (51) is provided at one end in a movably sealed position within the displacement adjustment hole (11) along the axial direction of the displacement adjustment hole (11). A drive module is used to drive the plunger (51) to move axially along the displacement adjustment hole (11).

10. The rotor assembly according to claim 9, characterized in that, The drive module includes: The elastic reset member (52) is used to give the plunger (51) a tendency to move axially toward the center axis of the rotor (1) along the displacement adjustment hole (11); An adjusting shaft (53) is movably inserted through the rotor (1) along the axial direction of the rotor (1). The adjusting shaft (53) has a displacement adjusting surface (531). The other end of the plunger (51) abuts against the adjusting surface (531) along the axial direction of the displacement adjusting hole (11). From one end of the adjusting shaft (53) to the other end, the distance between the adjusting surface (531) and the central axis of the adjusting shaft (53) gradually increases.

11. The rotor assembly according to claim 10, characterized in that, The displacement adjustment unit is provided in multiple ways, and the multiple displacement adjustment units are arranged at intervals along the circumference of the rotor (1). The adjusting shaft (53) has a plurality of adjusting surfaces (531) connected sequentially along its circumference, and the plurality of adjusting surfaces (531) are arranged in a one-to-one correspondence with the plurality of displacement adjusting units.

12. The rotor assembly according to claim 10, characterized in that, At least one displacement adjustment unit is provided between two adjacent rolling units (2).

13. A fluid-driven device, characterized in that, The fluid drive device includes a housing (6) and a rotor assembly as described in any one of claims 1 to 12, wherein the rotor assembly is rotatably disposed within the housing (6) about its own axis, a main pressure chamber (40) is formed between the outer wall of the rotor (1) and the inner wall of the housing (6), and the rolling element (22) abuts against the inner wall of the housing (6); The outer casing (6) is provided with at least one pair of fluid ports, and the volume of the main pressure chamber (40) between the two fluid ports of each pair of fluid ports tends to increase along the rotation direction of the rotor (1), or tends to increase first and then decrease. The two fluid ports of each pair of fluid ports are a fluid inlet (61) and a fluid outlet (62), and the fluid inlet and outlet (10) can communicate with the main pressure chamber (40) that is connected to the fluid inlet (61).

14. The fluid drive device according to claim 13, characterized in that, The fluid drive device includes a motor or a turbine.

15. The fluid drive device according to claim 13, characterized in that, The rolling unit (2) further includes a bracket (21), and the bracket (21) is rotatably connected to a rolling element (22) at each end of the rotor (1) in the circumferential direction; a back cavity (20) is formed on each side of the sealing position where the rolling unit (2) is sealed to the rotor (1); the two back cavities (20) are respectively a first back cavity (20a) and a second back cavity (20b) distributed at intervals along a preset direction, and the preset direction is the rotation direction of the rotor (1) from one end of the bracket (21) to the other end of the bracket (21); The two rolling elements (22) of the rolling unit (2) abut against the inner wall of the outer shell (6), so that a secondary pressure chamber (30) is formed between the rolling unit (2) and the inner wall of the outer shell (6). A one-way valve (8) is provided on the bracket (21), and the one-way valve (8) can unidirectionally connect the secondary pressure chamber (30) with the second back chamber (20b).

16. The fluid drive device according to claim 13, characterized in that, The intersection line between the inner wall of the outer shell (6) and the first preset plane is elliptical, and the first preset plane is perpendicular to the central axis of the rotor (1); the two fluid ports of each pair of fluid ports are respectively arranged on both sides of the second preset plane (100), and are both located on the same side of the third preset plane (200); the plane containing the central axis of the rotor (1) and the major axis of the ellipse is the second preset plane (100), and the plane containing the central axis of the rotor (1) and the minor axis of the ellipse is the third preset plane (200); The intersection of the central axis of the fluid port and the inner wall of the outer shell (6) is a preset intersection point, and the shortest line connecting the preset intersection point and the central axis of the rotor (1) is a preset connection line; the two preset connection lines corresponding to each pair of fluid ports are perpendicular and symmetrically arranged about the second preset plane (100).

17. The fluid drive device according to claim 16, characterized in that, The fluid inlet is provided in two pairs, with the two fluid inlets (61) located on both sides of the second preset plane (100).

18. A vehicle, characterized in that, Includes the fluid drive device according to any one of claims 13 to 17.

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