Inner curve radial plunger motor

Abstract

The utility model provides an inner curve radial plunger motor. The inner curve radial plunger motor comprises a shell, a cam surface, a cylinder body plunger part contained in the shell and a flushing oil way. Wherein the plunger part is arranged in a plunger hole of the cylinder body and slides in the plunger hole in a reciprocating mode in the radial direction under the guidance of the cam face, a plunger part-cam face gap extending in the axial direction is formed between the plunger part and the cam face, and the flushing oil way comprises an inlet and an outlet which are located in the shell. The first oil guide channel is communicated to the plunger part-cam surface gap from the inlet, the second oil guide channel is formed by the plunger part-cam surface gap, and the third oil guide channel is communicated to the outlet from the plunger part-cam surface gap. In the operation process of the motor, oil enters the flushing oil way from the inlet, sequentially passes through the first oil guide channel, the second oil guide channel and the third oil guide channel and then flows out from the outlet, heat generated in the motor is taken away in time, and the heat dissipation capacity of the inner curve radial plunger motor is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic transmission, and in particular to an inner-curve radial piston motor. Background Art

[0002] The inner curve radial piston motor has a higher working pressure, a larger output torque and a higher efficiency, and is therefore widely used in engineering machinery, metallurgy, petroleum, shipbuilding and other fields. During the operation of the inner curve radial piston motor, a large amount of heat will be generated due to the reciprocating motion of the plunger part and the friction between the plunger part and the cam surface, which will directly affect the performance, life and reliability of the inner curve radial piston motor. Summary of the invention

[0003] In view of this, the present application provides an inner-curve radial piston motor, which can effectively improve the heat dissipation of the product, thereby improving the performance, life and reliability of the inner-curve radial piston motor.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] An inner-curve radial piston motor, comprising:

[0006] case;

[0007] Cam surface;

[0008] a cylinder housed within the housing;

[0009] A plunger portion is disposed in the plunger hole of the cylinder body and radially reciprocates in the plunger hole under the guidance of the cam surface, and an axially extending plunger portion-cam surface gap is provided between the plunger portion, the plunger hole and the cam surface;

[0010] The flushing oil circuit includes an inlet and an outlet located on the housing, a first oil guide passage connected from the inlet to the plunger portion-cam surface gap, a second oil guide passage formed by the plunger portion-cam surface gap, and a third oil guide passage connected from the plunger portion-cam surface gap to the outlet.

[0011] Preferably, the first oil guiding channel and the third oil guiding channel both include at least one hole or groove machined specifically for flushing the oil circuit, the inlet is connected to a pressurized oil source, and the oil is forced to flow through the flushing oil circuit.

[0012] Preferably, the inlet and the outlet are located at one axial end of the motor, and the cylinder body is located at the other axial end of the motor.

[0013] Preferably, it also includes a shaft arranged in the housing, the housing includes a static housing and a dynamic housing, the cam surface is arranged on the dynamic housing; the shaft is fixedly connected to the static housing and extends into the dynamic housing, and the cylinder body is fixedly sleeved on the shaft by a retaining member fixedly connected to the shaft; a distribution disk is sleeved on the shaft, and the distribution disk is located on the side of the cylinder body close to the static housing, and rotates around the shaft driven by the dynamic housing.

[0014] Preferably, the first oil guide passage includes, in sequence, a first stationary housing passage provided on the stationary housing, a first shaft passage provided on the shaft, and a retaining member passage on the retaining member.

[0015] Preferably, the first stationary housing passage and the first shaft passage are communicated with each other via a first annular groove provided on the stationary housing and / or the shaft.

[0016] Preferably, the shaft has an installation inner cavity, a dual-speed valve is arranged in the installation inner cavity, and the installation inner cavity is communicated with the first oil guide channel so that the leaked oil in the installation inner cavity flows into the first oil guide channel.

[0017] Preferably, the installation inner cavity is connected to the first shaft channel, and / or the first stationary housing channel is connected to the first shaft channel through a first annular groove arranged on the stationary housing and / or the shaft, and the installation inner cavity is connected to the first annular groove through a first oil drain hole arranged on the shaft.

[0018] Preferably, the end of the dynamic housing away from the static housing includes an end cover, and the first oil guide channel also includes an end cover-cylinder body gap located between the end cover and the cylinder body; the end cover-cylinder body gap connects the retaining member channel and the second oil guide channel.

[0019] Preferably, the distribution plate, the cylinder body, the shaft and the retaining member form a closed cavity, and a second oil drain hole connected to the end cover-cylinder body gap is provided on the retaining member and / or the shaft, so that leaked oil from the contact part between the distribution plate and the cylinder body into the closed cavity can flow into the end cover-cylinder body gap.

[0020] Preferably, the third oil guide passage includes a distribution plate-cylinder body gap between the distribution plate and the cylinder body, and the distribution plate-cylinder body gap is connected to the second oil guide passage so that the leaked oil from the contact part between the distribution plate and the cylinder body flows into the distribution plate-cylinder body gap.

[0021] Preferably, a cylindrical retainer is fixedly connected to the static housing, the retainer is fixedly connected to the static housing and / or the shaft, a bearing is arranged between the dynamic housing and the retainer, and the distribution plate includes a cylindrical portion located between the retainer and the shaft in the radial direction, and a disc portion located between the bearing and the cylinder body in the axial direction;

[0022] Among them, the third oil guide channel includes a retainer-distribution plate gap located between the retainer and the cylindrical portion, and a third oil drain hole opened on the disk portion and connecting the distribution plate-cylinder body gap and the retainer-distribution plate gap, and the space where the bearing is located is connected to the third oil guide channel.

[0023] Preferably, the third oil guide channel also includes a second stationary housing channel and a second shaft channel opened on the stationary housing and the shaft to guide the oil to the outlet, and an annular cavity surrounding the shaft formed by the retaining frame, the distribution plate and the shaft, and the annular cavity connects the retaining frame-distribution plate gap and the second shaft channel.

[0024] Preferably, a flushing valve is provided in the first oil guide channel to introduce low-pressure oil in the hydraulic system where the inner curve radial piston motor is located into the flushing flow channel.

[0025] During the operation of the inner-curve radial piston motor provided by the present application, the oil with a lower temperature enters the flushing oil circuit through the inlet located on the housing, and flows through the first oil guide channel, the second oil guide channel and the third oil guide channel in sequence. Since the second oil guide channel is formed by the gap between the plunger part and the cam surface, the oil with a lower temperature will directly exchange heat with the plunger part and the cam surface when flowing through the second oil guide channel, quickly absorb and take away the heat in the plunger part and the cam surface, thereby effectively improving the heat dissipation capacity of the inner-curve radial piston motor. At the same time, the oil flowing through the gap between the plunger part and the cam surface can also act as a lubricant, reducing the friction between the plunger part and the cam surface, thereby reducing the heat generation, and improving the performance, life and reliability of the inner-curve radial piston motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0027] Figure 1 A cross-sectional view of an inner-curve radial piston motor provided in an embodiment of the present application;

[0028] Figure 2 for Figure 1 A cross-sectional view of the inner curve radial piston motor in another direction;

[0029] Figure 3 for Figure 1 A cross-sectional view of the inner curve radial piston motor in another direction;

[0030] Figure 4 A cross-sectional view of another inner-curve radial piston motor provided in an embodiment of the present application;

[0031] Figure 5 A cross-sectional view of another inner-curve radial piston motor provided in an embodiment of the present application;

[0032] Figure 6 It is a cross-sectional view of the flush valve in the embodiment of the present application.

[0033] exist Figure 1-Figure 6 middle:

[0034] 1-static housing, 2-dynamic housing, 3-shaft, 4-cylinder body, 5-first radial hole, 6-first annular groove, 7-second radial hole, 8-first axial hole, 9-third radial hole, 10-second axial hole, 11-third axial hole, 12-end cover-cylinder body clearance, 13-plunger part-cam surface clearance, 14-distributor-cylinder body clearance, 15-third oil leakage hole, 16-retainer-distributor clearance, 17-annular cavity, 18-fourth radial hole, 19-fourth axial hole, 20-fifth radial hole, 21-arc oil guide hole; 22-first oil leakage hole, 23-retainer, 24-distributor, 25-retainer, 26-bearing, 27-plunger part, 28-end cover, 29-dual-speed valve, 30-flushing valve, 31-second annular groove, 32-closed cavity, 33-fifth axial hole, 34-sixth radial hole. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] like Figure 1-Figure 6As shown, the embodiment of the present application provides an inner curve radial piston motor, which includes a housing, and the housing includes a static housing 1 and a dynamic housing 2, wherein the static housing 1 refers to a housing that remains stationary during the operation of the motor, and the dynamic housing 2 refers to a housing that rotates relative to the static housing 1 during the operation of the motor; a shaft 3 is provided inside the housing, and one end of the shaft 3 is fixed to the static housing 1, and the other end extends into the dynamic housing 2. During the operation of the motor, the dynamic housing 2 rotates relative to the static housing 1 and the shaft 3 under the action of the hydraulic pressure, thereby outputting torque.

[0037] like Figure 1-Figure 3 As shown, the dynamic housing 2 is rotatably connected to the static housing 1 and / or the shaft 3 through the retainer 25 and the bearing 26. Exemplarily, in some embodiments, one end of the static housing 1 close to the dynamic housing 2 is fixedly connected to the retainer 25 and extends into the interior of the dynamic housing 2, and there is a gap between the peripheral side of the retainer 25 and the inner wall of the dynamic housing 2 for installing the bearing 26, thereby realizing the rotatable connection between the dynamic housing 2 and the static housing 1.

[0038] Continue as Figure 1-Figure 3 As shown, in this embodiment, the structure such as the distribution plate 24 and the cylinder body 4 is used to enable the dynamic housing 2 to rotate under the action of the hydraulic pressure. Specifically, the distribution plate 24 and the cylinder body 4 are both sleeved on the shaft 3, and the distribution plate 24 is located on the side of the cylinder body 4 close to the static housing 1. Among them, the distribution plate 24 is connected to the dynamic housing 2, and the interior of the distribution plate 24 has a high-pressure oil hole and a low-pressure oil hole; the cylinder body 4 is fixedly connected to the shaft 3, and a plurality of plunger holes are arranged on the circumference of the cylinder body 4, and a plunger part 27 is slidably arranged in the plunger hole; the inner wall of the dynamic housing 2 is provided with a cam surface that always abuts against the plunger part 27 at the position corresponding to the plunger part 27 (the cam surface and the dynamic housing 2 can be set as a whole or separately, and can be adaptively designed according to needs), which is used to guide the plunger part 27 to slide radially back and forth in the plunger hole. During the operation of the motor, the distribution plate 24 rotates relative to the cylinder body 4, and the high-pressure oil holes and low-pressure oil holes in the distribution plate 24 are alternately connected to the plunger holes of the cylinder body 4. When the high-pressure oil holes are connected to the plunger holes, the hydraulic oil enters the plunger holes, thereby causing the plunger portion 27 to move toward the outside of the plunger hole to drive the dynamic housing 2 to rotate.

[0039] Preferably, the distribution disc 24 in this embodiment is anti-twist connected to the moving housing 2, so that the distribution disc 24 can rotate relative to the cylinder body 4 under the drive of the moving housing 2. In an exemplary embodiment, a positioning pin (not shown in the figure) is provided between the distribution disc 24 and the moving housing 2 to achieve circumferential limit between the distribution disc 24 and the cam surface, so as to achieve the driving of the housing on the distribution disc 24, so that the distribution disc 24 rotates around the axis 3 during the operation of the motor. In another exemplary embodiment, a limiting protrusion is provided on the inner wall of the moving housing 2 corresponding to the assembly position of the distribution disc 24, and a limiting groove matched with the limiting protrusion is provided on the circumferential side of the distribution disc 24. The distribution disc 24 and the moving housing 2 are connected to an anti-twist connection through the limiting protrusion and the limiting groove, so that the distribution disc 24 can rotate around the axis 3 under the drive of the moving housing 2.

[0040] Further, such as Figure 1-Figure 3 As shown, the distribution plate 24 in this embodiment includes an axially extending cylindrical portion and a disc-shaped portion located at one end of the cylindrical portion, wherein the disc-shaped portion is used to achieve an anti-twist connection with the moving housing 2, and the cylindrical portion extends to the gap between the retaining frame 25 and the shaft 3, thereby effectively improving the compactness of the internal structure of the inner curve radial piston motor.

[0041] In addition, if Figure 1-Figure 3 As shown, the cylinder body 4 is fixed on the shaft 3 through the retainer 23. Specifically, an assembly hole is provided at the axial center of the cylinder body 4 to realize the assembly between the cylinder body 4 and the shaft 3, and one end face of the cylinder body 4 abuts against the shoulder on the shaft, and the retainer 23 is fixed to the end face of the shaft 3 through a threaded structure (such as a bolt), and the end face of the retainer 23 close to one end of the shaft 3 can abut against the other end face of the cylinder body 4, thereby fixing the cylinder body 4 on the shaft 3. Furthermore, the cylinder body 4 and the shaft 3 are also connected to prevent twisting through a spline structure.

[0042] In some embodiments, the plunger portion 27 includes a plunger and a roller, wherein the plunger is slidably disposed in the plunger hole, and the roller is rollingly disposed at one end of the plunger close to the cam surface and abuts against the cam surface. Under the above structure, the friction between the plunger portion 27 and the cam surface is rolling friction, thereby effectively reducing the rotation resistance of the moving housing 2, and at the same time, effectively reducing the generation of heat, thereby ensuring the normal operation of the motor.

[0043] It should be pointed out that during the operation of the above-mentioned motor, a large amount of heat will be generated due to friction between the distribution plate 24 and the cylinder body 4, between the plunger part 27 and the plunger hole, and between the plunger part 27 and the cam surface, which will affect the performance, life and reliability of the inner curve radial piston motor; specifically, high temperature will cause the viscosity of the hydraulic oil to decrease, thereby reducing the working efficiency of the motor, and long-term high-temperature operation will accelerate the wear of the internal parts of the motor, thereby shortening its service life; in addition, internal heat generation may cause the motor to overheat, thereby affecting its reliability and safety.

[0044] In response to the above problems, the internal curve radial piston motor in the embodiment of the present application is provided with a flushing oil circuit, and the flushing oil circuit includes an inlet and an outlet arranged on the housing, and a first oil guide channel, a second oil guide channel, and a third oil guide channel connected in sequence. During the operation of the motor, oil (including cooling oil and leakage oil and other media flowing through the flushing oil circuit) enters the flushing oil circuit from the inlet, and flows out from the outlet after flowing through the first oil guide channel, the second oil guide channel, and the third oil guide channel in sequence; in the above process, a temperature gradient is formed between the oil and the heat-generating parts inside the motor (that is, structural parts that can generate heat during the operation of the motor), thereby taking away the heat generated inside the motor to reduce the temperature inside the motor and ensure the performance, life and reliability of the motor. Further preferably, the inlet and outlet of the flushing oil circuit are located at one axial end of the motor, the flushing oil circuit passes through the cylinder body 4, and the cylinder body 4 is located at the other axial end of the motor. In this way, the distribution range of the flushing oil circuit inside the motor can be increased, thereby improving the heat dissipation effect. In an exemplary embodiment, Figure 1 As shown, the inlet and outlet of the flushing oil circuit in this embodiment are both arranged on the static housing 1, and the cylinder body 4 is located at one end of the housing inner cavity away from the static housing 1.

[0045] like Figure 1 As shown, the first oil guide channel in this embodiment includes a first static housing channel, a first shaft channel, a retaining member channel and an end cover-cylinder body gap 12 located between an end cover 28 (arranged at one end of the dynamic housing 2 away from the static housing 1 and sealed to the dynamic housing 2) and the cylinder body 4, which are connected in sequence.

[0046] In an exemplary embodiment, the first static housing passage is mainly arranged on the static housing 1, including a first radial hole 5 penetrating the static housing 1, and one end of the first radial hole 5 is connected to the inlet, and a flushing valve may be arranged upstream of the first radial hole 5, and the flushing valve introduces low-pressure oil from the hydraulic system into the motor. The other end of the first radial hole 5 is connected to the first shaft passage. The first shaft passage is arranged on the shaft 3, including a second radial hole 7, a first axial hole 8, a third radial hole 9 and a second axial hole 10 that are connected in sequence, wherein the second radial hole 7 is connected to the first radial hole 5, and the second axial hole 10 is connected to the retainer passage. The retainer passage is arranged on the retainer 23, including a third axial hole 11 penetrating the retainer 23, and one end of the third axial hole 11 is connected to the second axial hole 10, and the other end is connected to the end cover-cylinder body gap 12.

[0047] Further, in a preferred embodiment, the first radial hole 5 and the second radial hole 7 are connected through the first annular groove 6, so that in the process of assembling the shaft 3 and the static housing 1, only the relative position between the two in the axial direction needs to be paid attention to to ensure the communication between the first static housing channel and the first shaft channel, thereby effectively reducing the difficulty of assembling the shaft 3 and the static housing 1. It should be noted that the first annular groove 6 can be an annular groove structure provided on the inner wall of the static housing 1, or an annular groove structure provided on the shaft 3, or composed of the inner wall of the static housing 1 and the annular groove structure on the shaft 3, and this application does not make any specific limitation on this.

[0048] Furthermore, in a preferred embodiment, the second axial hole 10 and the third axial hole 11 are the center holes of the shaft 3 and the retaining member 23, respectively. In this way, in the process of assembling the retaining member 23 on the shaft 3, there is no need to adjust the relative position between the retaining member 23 and the shaft 3, and conduction between the second axial hole 10 and the third axial hole 11 can be achieved, thereby simplifying the assembly process of the retaining member 23, improving the assembly efficiency, and reducing the difficulty of assembly.

[0049] like Figure 1-Figure 3 As shown, the second oil guide channel in this embodiment is formed by the plunger portion 27, the plunger hole and the cam surface, and the axially extending plunger portion-cam surface gap 13. In this way, when the oil flows through the second oil guide channel, it can quickly absorb and take away the heat in the plunger portion 27 and the cam surface, thereby ensuring the normal working state of the plunger portion 27 and the cam surface. At the same time, the oil flowing through the plunger portion-cam surface gap 13 can also act as a lubricant to reduce the friction between the plunger portion 27 and the cam surface, thereby reducing the heat generation and improving the performance, life and reliability of the inner curve radial piston motor.

[0050] like Figure 1-Figure 2 As shown, the third oil guide channel in this embodiment includes the distribution plate-cylinder body gap 14, the third oil drain hole 15, the retaining frame-distribution plate gap 16, the annular cavity 17, the second shaft channel and the second static housing channel which are connected in sequence.

[0051] In an exemplary embodiment, the distributor-cylinder gap 14 is located between the distributor 24 and the cylinder 4, and the distributor-cylinder gap 14 is connected to the plunger-cam surface gap 13. The third oil drain hole 15 is provided on the disc portion, and a plurality of third oil drain holes 15 are provided, and the plurality of third oil drain holes 15 surround the assembly hole of the distributor 24 and are evenly arranged, so that the oil in the distributor-cylinder gap 14 can flow quickly and evenly into the retainer-distributor gap 16, thereby ensuring the cooling efficiency and the uniformity of the cooling; in addition, it should be pointed out that the shape, number and size of the third oil drain hole 15 can be adaptively designed as needed, and the present application does not make specific restrictions on this. The retainer-distributor gap 16 is located between the retainer 25 and the cylinder 4, specifically, it includes the gap between the retainer 25 and the disc portion and the gap between the retainer 25 and the cylindrical portion. The annular cavity 17 around the shaft 3 is formed between the retainer 25, the distribution plate 24 and the shaft 3, and is used to connect the retainer-distribution plate gap 16 and the second shaft channel. The second shaft channel is arranged on the shaft 3, and includes a fourth radial hole 18, a fourth axial hole 19 and a fifth radial hole 20 that are connected in sequence, wherein the fourth radial hole 18 is connected to the annular cavity 17, and the fifth radial hole 20 is connected to the second static housing channel. The second static housing channel is arranged on the static housing 1, and includes an arc-shaped oil guide hole 21, and one end of the arc-shaped oil guide hole 21 is connected to the fifth radial hole 20, and the other end is connected to the outlet.

[0052] Further, in a preferred embodiment, the fifth radial hole 20 and the arc-shaped oil guide hole 21 are connected through the second annular groove 31. In this way, in the process of assembling the shaft 3 and the static housing 1, it is only necessary to pay attention to the relative position of the two in the upward direction of the shaft 3 to ensure the communication between the second static housing channel and the second shaft channel, thereby effectively reducing the difficulty of assembly between the shaft 3 and the static housing 1. It should be noted that the second annular groove 31 can be an annular groove structure provided on the inner wall of the static housing 1, or an annular groove structure provided on the shaft 3, or a combination of the inner wall of the static housing 1 and the annular groove structure on the shaft 3, and this application does not make any specific limitation on this.

[0053] In addition, if Figure 1-Figure 3 As shown, the interior of the shaft 3 in this embodiment has an installation cavity, and a dual-speed valve 29 is provided in the installation cavity. During the operation of the motor, part of the high-pressure flow channel and the low-pressure flow channel can be selectively short-circuited so that only part of the plunger works, thereby realizing two different speed outputs of the motor.

[0054] Based on the setting of the two-speed valve 29, in some embodiments, the installation cavity is connected to the first oil guide channel, so that the leaked oil in the installation cavity flows into the first oil guide channel. In this way, on the one hand, the leaked oil in the installation cavity can be promptly guided out, thereby ensuring the normal operation of the two-speed valve 29; on the other hand, the leaked oil can be used to take out the heat generated in the installation cavity, so as to avoid the two-speed valve 29 being unable to maintain a normal working state due to excessive temperature.

[0055] Furthermore, in a specific embodiment, the installation inner cavity is directly connected to the first shaft channel, thereby achieving communication between the installation inner cavity and the first oil guide channel. Figure 1 As shown, one end of the third radial hole 9 in the first shaft channel is connected to the first axial hole 8, and the other end is connected to the installation inner cavity. At the same time, one end of the second axial hole 10 is connected to the installation inner cavity, and the other end is connected to the retaining member channel. In this arrangement, since it is not necessary to make a separate hole on the shaft 3 to achieve the connection between the installation inner cavity and the first oil guide channel, the motor manufacturing process can be simplified and the strength of the shaft 3 can be improved.

[0056] In another specific embodiment, the installation inner cavity is connected to the first oil guide channel through the first oil drain hole 22 provided on the shaft 3. Figure 3 As shown, the first static housing channel and the first shaft channel are connected through the first annular groove 6 provided on the shaft 3 and / or the static housing 1 (the composition of the first annular groove 6 is described above and will not be repeated here). At the same time, a first oil leakage hole 22 is provided on the shaft 3, and one end of the first oil leakage hole 22 is connected to the installation inner cavity, and the other end is connected to the first annular groove 6. Under this setting mode, the communication position of the first oil leakage hole 22 and the installation inner cavity can be adaptively designed according to needs, which is more conducive to the discharge of leaked oil in the installation inner cavity.

[0057] Of course, according to needs, during the specific implementation, the first oil drain hole 22 can be provided while the installation inner cavity is directly connected to the first shaft channel, so that the installation inner cavity is connected to the first annular groove 6.

[0058] In addition, if Figure 2As shown, a closed cavity 32 is formed between the distribution disc 24, the cylinder body 4, the shaft 3 and the retaining member 23 in this embodiment. It should be pointed out here that during the operation of the motor, a certain amount of leakage oil will flow into the closed cavity 32 between the distribution disc 24 and the cylinder body 4, and the leakage oil flowing into the closed cavity 32 will change the pressure of the closed cavity 32, thereby generating a force that separates the distribution disc 24 and the cylinder body 4, affecting the normal operation of the motor. Based on the above problems, in order to improve the stability of the motor operation, a second oil drain hole is provided in this embodiment, which is used to connect the closed cavity 32 and the flushing oil circuit, so that the leakage oil in the closed cavity 32 flows into the flushing oil circuit in time to ensure that the pressure in the closed cavity 32 is in a normal state, thereby ensuring the normal operation of the motor.

[0059] In a specific embodiment, the second oil drain hole is opened on the retaining member 23, and can realize the communication between the closed cavity 32 and the end cover-cylinder body gap 12. Specifically, Figure 4 As shown, the second oil drain hole is a fifth axial hole 33 opened on the retaining member 23, one end of the fifth axial hole 33 is connected to the closed cavity 32, and the other end is connected to the end cover-cylinder body gap 12, and a plurality of fifth axial holes 33 are arranged around the axis of the retaining member 23 to meet the requirement of leaking oil flowing out of the closed cavity 32 quickly.

[0060] In another specific embodiment, the second oil drain hole is opened on the shaft 3, and can make the closed cavity 32 communicate with the first shaft channel. Specifically, Figure 5 As shown, the second oil drain hole is a sixth radial hole 34 opened on the shaft 3, and one end of the sixth radial hole 34 is connected to the closed cavity 32, and the other end is connected to the first shaft channel.

[0061] Of course, according to needs, during the specific implementation, multiple second oil leakage holes can also be provided, and multiple different oil leakage holes are respectively connected to the end cover-cylinder body gap 12 and the first shaft channel.

[0062] In addition, if Figure 2 As shown, part of the leaked oil between the distribution plate 24 and the cylinder body 4 will also directly flow into the distribution plate-cylinder body gap 14, merge with the oil in the distribution plate-cylinder body gap 14, and flow into the retaining frame-distribution plate gap 16 through the third oil drain hole 15.

[0063] In addition, if Figure 2 As shown, the space where the bearing 26 is located is connected to the third oil guide channel. Specifically, the space where the bearing 26 is located has an opening on one side of the disc-shaped portion facing the distributor plate 24, and is connected to the retainer-distributor plate gap 16 through the opening, so that the heat in the space where the bearing 26 is located can be transferred to the flushing oil to prevent the operating temperature of the bearing 26 from being too high.

[0064] In addition, if Figure 3 and Figure 6 As shown, the inner curve radial piston motor in this embodiment is provided with a flushing valve 30 in the first oil guide channel, which is used to introduce the low-pressure oil in the hydraulic system where the inner curve radial piston motor is located into the flushing flow channel. The specific structure of the flushing valve 30 can refer to the prior art, and this application will not repeat it here.

[0065] In a specific embodiment, the flushing valve 30 is arranged at the oil inlet position of the first static housing channel and is connected to the inlet of the flushing oil circuit, and the inlet of the flushing oil circuit is connected to the pressurized oil source (i.e., the low-pressure oil in the hydraulic system). During the operation of the motor, the oil is introduced into the flushing oil circuit under the action of the flushing valve 30 and is forced to flow into the flushing oil circuit (because the low pressure introduced into the system is used as the power source of the oil, and all places except the flushing oil circuit are sealed or have only very small gaps, so that the oil can only flow along the designed flushing oil circuit, and then during the operation of the motor, the oil is forced to flow through the flushing oil circuit) to achieve cooling of the inside of the motor.

[0066] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0067] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0068] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0069] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0070] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0071] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. An inner curve radial piston motor, characterized in that: include: case; Cam surface; a cylinder housed within the housing; A plunger portion is disposed in the plunger hole of the cylinder body and radially reciprocates in the plunger hole under the guidance of the cam surface, and an axially extending plunger portion-cam surface gap is provided between the plunger portion, the plunger hole and the cam surface; The flushing oil circuit includes an inlet and an outlet located on the housing, a first oil guide passage connected from the inlet to the plunger portion-cam surface gap, a second oil guide passage formed by the plunger portion-cam surface gap, and a third oil guide passage connected from the plunger portion-cam surface gap to the outlet.

2. The inner curve radial piston motor according to claim 1, characterized in that: The first oil guide channel and the third oil guide channel both include at least one hole or groove machined specifically for flushing the oil circuit, the inlet is connected to a pressurized oil source, and the oil is forced to flow through the flushing oil circuit.

3. The inner curve radial piston motor according to claim 1, characterized in that: The inlet and the outlet are located at one axial end of the motor, and the cylinder is located at the other axial end of the motor.

4. The inner curve radial piston motor according to claim 1, characterized in that: It also includes a shaft arranged in the housing, the housing includes a static housing and a dynamic housing, the cam surface is arranged on the dynamic housing; the shaft is fixedly connected to the static housing and extends into the dynamic housing, and the cylinder body is fixedly sleeved on the shaft by a retaining member fixedly connected to the shaft; a distribution plate is sleeved on the shaft, the distribution plate is located on the side of the cylinder body close to the static housing, and rotates around the shaft driven by the dynamic housing.

5. The inner curve radial piston motor according to claim 4, characterized in that: The first oil guide passage sequentially includes a first stationary housing passage arranged on the stationary housing, a first shaft passage arranged on the shaft, and a retaining member passage on the retaining member.

6. The inner curve radial piston motor according to claim 5, characterized in that: The first stationary housing passage is communicated with the first shaft passage via a first annular groove disposed on the stationary housing and / or the shaft.

7. The inner curve radial piston motor according to claim 5, characterized in that: The shaft has an installation inner cavity, a dual-speed valve is arranged in the installation inner cavity, and the installation inner cavity is communicated with the first oil guide channel so that the leaked oil in the installation inner cavity flows into the first oil guide channel.

8. The inner curve radial piston motor according to claim 7, characterized in that: The installation inner cavity is connected to the first shaft channel, and / or the first stationary housing channel is connected to the first shaft channel through a first annular groove arranged on the stationary housing and / or the shaft, and the installation inner cavity is connected to the first annular groove through a first oil drain hole arranged on the shaft.

9. The inner curve radial piston motor according to claim 8, characterized in that: One end of the dynamic housing away from the static housing includes an end cover, and the first oil guide channel also includes an end cover-cylinder body gap located between the end cover and the cylinder body; the end cover-cylinder body gap connects the retaining member channel and the second oil guide channel.

10. The inner curve radial piston motor according to claim 9, characterized in that: The distribution plate, the cylinder body, the shaft and the retaining member form a closed cavity, and a second oil drain hole connected to the end cover-cylinder body gap is provided on the retaining member and / or the shaft, so that leaked oil from the contact part between the distribution plate and the cylinder body into the closed cavity can flow into the end cover-cylinder body gap.

11. The inner curve radial piston motor according to claim 4, characterized in that: The third oil guide passage includes a distribution plate-cylinder body gap between the distribution plate and the cylinder body, and the distribution plate-cylinder body gap is connected to the second oil guide passage so that the leaked oil from the contact portion between the distribution plate and the cylinder body flows into the distribution plate-cylinder body gap.

12. The inner curve radial piston motor according to claim 11, characterized in that: A cylindrical retainer is fixedly connected to the static housing and / or the shaft, a bearing is arranged between the dynamic housing and the retainer, and the distribution plate includes a cylindrical portion located between the retainer and the shaft in the radial direction, and a disc portion located between the bearing and the cylinder body in the axial direction; Among them, the third oil guide channel includes a retainer-distribution plate gap located between the retainer and the cylindrical portion, and a third oil drain hole opened on the disk portion and connecting the distribution plate-cylinder body gap and the retainer-distribution plate gap, and the space where the bearing is located is connected to the third oil guide channel.

13. The inner curve radial piston motor according to claim 12, characterized in that: The third oil guide channel also includes a second stationary housing channel and a second shaft channel opened on the stationary housing and the shaft to guide the oil to the outlet, and an annular cavity surrounding the shaft formed by the retaining frame, the distribution plate and the shaft, and the annular cavity connects the retaining frame-distribution plate gap and the second shaft channel.

14. The inner curve radial piston motor according to any one of claims 1 to 13, characterized in that: A flushing valve is provided in the first oil guide channel to introduce low-pressure oil in the hydraulic system where the inner curve radial piston motor is located into the flushing flow channel.

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