Bidirectional cycloid pump convenient to lubricate

Abstract

The utility model discloses a two-way cycloid pump convenient to lubricate, and aims to provide the two-way cycloid pump convenient to lubricate, which can automatically lubricate bearings between a pump shaft and a pump shell and between the pump shaft and a pump cover in the working process of the two-way cycloid pump so as to ensure the lubricating performance of the pump shaft. The pump comprises a pump shell and a pump cover, the pump body inner cavity comprises an oil suction cavity and an oil pressing cavity; the inner rotor and the outer rotor are arranged in an inner cavity of the pump body through the pump shaft, a pump cover bearing is arranged between the pump shaft and the pump cover, a pump shell bearing is arranged between the pump shaft and the pump shell, an annular oil channel is arranged between the inner rotor and the pump shell bearing, and an annular oil cavity is formed between the inner rotor and the pump cover bearing. An axial oil duct communicated with the annular oil duct and the annular oil cavity is arranged between the pump shaft and the inner rotor, a first forced lubrication channel is arranged between one end face of the inner rotor and the inner wall of the inner cavity of the pump body, and the first forced lubrication channel is communicated with the oil pressing cavity and the annular oil duct.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of hydraulic oil pump, concretely relates to a bidirectional gerotor pump convenient for lubrication. BACKGROUND

[0002] With the continuous development of industrial technology, the requirement of the gear box in the hydraulic system to the hydraulic oil pump is greatly improved, therefore, the demand for the high-performance oil pump with reversible power source, high rotating speed and stable transmission is large in the industry at present. The bidirectional gerotor pump has the advantage of adapting to the reversible power source and is widely used in the industry. The bidirectional gerotor pump generally comprises a pump shell, a pump cover, a pump shaft, and a pump body inner cavity formed in the pump shell and the pump cover. The pump body inner cavity has a rotating pump body, a concentric inner rotor and an outer rotor, the inner rotor is arranged in the pump body inner cavity through the pump shaft, bearings are arranged between the pump shaft and the pump cover and between the pump shaft and the pump shell. The pump body inner cavity is also divided into an oil suction cavity and an oil pressure cavity according to the different oil in and out. In specific work, the pump shaft is driven to rotate by an external power source, the pump shaft drives the inner rotor and the outer rotor to rotate to complete the oil suction and oil pressure process, wherein the oil suction cavity forms a negative pressure, and the oil liquid enters the oil suction cavity through the oil inlet; the inner and outer rotors are sequentially engaged, and the oil liquid is brought into the oil pressure cavity with the rotation of the inner and outer rotors, and at the same time, the tooth gap is gradually reduced with the rotation of the inner and outer rotors, and the oil pressure is increased, so that the oil liquid brought from the oil suction cavity to the oil pressure cavity is discharged from the oil outlet.

[0003] The pump shaft is an important power component of the bidirectional gerotor pump, and the lubrication performance of the bearings between the pump shaft and the pump shell and between the pump shaft and the pump cover has a great influence on the transmission stability, service life and working efficiency of the pump; but the structure of the current bidirectional gerotor pump makes it inconvenient to add lubricating oil between the pump shaft and the pump shell and between the pump shaft and the pump cover, so that the current bidirectional gerotor pump often has poor lubrication effect between the pump shaft and the pump shell and the pump cover, which affects the transmission stability, service life and working efficiency of the bidirectional gerotor pump. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a bidirectional gerotor pump convenient for lubrication, which can automatically lubricate the bearings between the pump shaft and the pump shell and between the pump shaft and the pump cover during the working process of the bidirectional gerotor pump, so as to ensure the lubrication performance of the pump shaft.

[0005] The technical scheme of the utility model is:

[0006] A bidirectional gerotor pump convenient for lubrication, comprising:

[0007] A pump shell and a pump cover;

[0008] A pump body inner cavity comprising an oil suction cavity and an oil pressure cavity;

[0009] The inner rotor is arranged in the inner cavity of the pump body through the pump shaft, the pump cover bearing is arranged between the pump shaft and the pump cover, the pump shell bearing is arranged between the pump shaft and the pump shell, the annular oil channel is arranged between the inner rotor and the pump shell bearing, the annular oil cavity is arranged between the inner rotor and the pump cover bearing, the axial oil channel is arranged between the pump shaft and the inner rotor and communicates the annular oil channel and the annular oil cavity, and the first forced lubrication channel is arranged between the end surface of the inner rotor and the inner wall of the inner cavity of the pump body and communicates the pressure oil cavity and the annular oil channel.

[0010] During the rotation of the inner rotor and the outer rotor driven by the pump shaft, the gear teeth of the inner rotor and the outer rotor in the oil suction cavity gradually disengage to increase the sealed volume, a local vacuum is formed, and the oil enters the oil suction cavity under the action of the atmospheric pressure; the inner rotor and the outer rotor are sequentially engaged and rotated, the oil is carried into the pressure oil cavity, and the gap between the engaged teeth of the inner rotor and the outer rotor also gradually decreases with the rotation to increase the oil pressure, so that the oil carried from the oil suction cavity to the pressure oil cavity is discharged from the oil outlet to the outside of the pump. Since the first forced lubrication channel is arranged between the end surface of the inner rotor and the inner wall of the inner cavity of the pump body and communicates the pressure oil cavity and the annular oil channel, a small amount of oil flows through the first forced lubrication channel into the annular oil channel when the oil flows through the pressure oil cavity, and then enters the annular oil cavity through the axial oil channel. The oil in the annular oil channel enters the pump shaft and the pump shell bearing to lubricate the pump shell bearing, and the oil in the annular oil cavity enters the pump shaft and the pump cover bearing to lubricate the pump cover bearing, thereby realizing automatic lubrication of the bearings between the pump shaft and the pump shell and the bearings between the pump shaft and the pump cover during the operation of the bidirectional cycloid pump, ensuring the lubrication performance of the pump shaft and improving the transmission stability, service life, working efficiency and the like of the bidirectional cycloid pump.

[0011] As preferred, the bidirectional cycloid pump further comprises a rotating pump body arranged in the inner cavity of the pump body, the inner rotor and the outer rotor are arranged in the rotating pump body, the rotating pump body is provided with a shaft through hole, the shaft through hole is located between the pump cover bearing and the inner rotor, the pump shaft passes through the shaft through hole, and the annular oil cavity comprises:

[0012] a first annular cavity formed between the inner rotor and the rotating pump body and arranged around the pump shaft;

[0013] a second annular cavity formed between the rotating pump body and the pump cover bearing and arranged around the pump shaft;

[0014] a communication channel arranged between the shaft through hole and the pump shaft. In this way, during the operation of the bidirectional cycloid pump, the oil in the annular oil channel enters the first annular cavity through the axial oil channel first, and then enters the second annular cavity through the communication channel, and the oil in the second annular cavity enters the pump shaft and the pump cover bearing to lubricate the pump cover bearing.

[0015] As preferred, a gap is provided between the shaft through hole and the pump shaft, and the gap forms the communication oil passage. In this way, on the one hand, the pump shaft is prevented from contacting the shaft through hole, and on the other hand, the communication oil passage is formed in the gap between the shaft through hole and the pump shaft, which facilitates the actual processing and manufacturing of the communication oil passage.

[0016] As preferred, a spring is further provided, the spring is sleeved on the pump shaft, and the spring is arranged between the rotary pump body and the pump cover bearing. The spring provides an elastic force to enable the rotary pump body to abut against the end faces of the inner rotor and the outer rotor. The rotary pump body abuts against the end faces of the inner rotor and the outer rotor under the action of the spring, which prevents a too large gap from being formed between the rotary pump body and the pump shell. On the other hand, when the power source direction changes, the rotary pump body can rotate without being stuck and can rotate together with the pump cover bearing, thereby reducing the frictional resistance suffered by the rotary pump body during rotation.

[0017] As preferred, the pump cover bearing comprises a thrust bearing, one end of the spring abuts against the thrust bearing, and the other end of the spring abuts against the rotary pump body.

[0018] As preferred, an axial oil chamber is provided between the pump shaft end face and the pump cover, the lubricating oil between the pump cover bearing and the pump shaft can enter the axial oil chamber, an axial oil return hole is provided in the pump shaft, one end of the axial oil return hole is in communication with the axial oil chamber, and the other end of the axial oil return hole is in communication with the pump shaft end portion away from the pump cover. In this way, during the operation of the bidirectional gerotor pump, the oil in the annular oil chamber enters between the pump shaft and the pump cover bearing, lubricates the pump cover bearing, and then enters the axial oil chamber. Then, the oil returns to the gear box through the axial oil return hole, forming a circulation of the lubricating oil, which is conducive to the continuous entry of the oil between the pump shaft and the pump cover bearing, lubrication of the pump cover bearing, and guarantee of the lubrication effect of the pump cover bearing.

[0019] As preferred, a bearing seat is further provided on the pump shell, the bearing seat and the pump cover are located on opposite sides of the pump shell, the pump shaft passes through the bearing seat, and a reinforcing bearing is provided between the pump shaft and the bearing seat. This scheme is suitable for the case that the pump shaft is long. The bearing seat and the reinforcing bearing support the pump shaft extending out of the pump shell, thereby ensuring that the pump shaft is uniformly stressed.

[0020] As preferred, an inner seat oil chamber is provided in the bearing seat and surrounds the pump shaft, the inner seat oil chamber is located between the pump shell and the reinforcing bearing, a second forced lubrication passage is provided on the pump shell, and the second forced lubrication passage is in communication with the oil pressing chamber and the inner seat oil chamber. In this way, during the operation of the bidirectional gerotor pump, a small amount of oil enters the inner seat oil chamber through the second forced lubrication passage when the oil flows through the oil pressing chamber. The oil in the inner seat oil chamber enters between the pump shaft and the reinforcing bearing, thereby lubricating the reinforcing bearing. In this way, the lubrication of the bearing between the pump shaft and the bearing seat is automatically realized during the operation of the bidirectional gerotor pump, the lubrication performance of the pump shaft is guaranteed, and the transmission stability, service life, working efficiency, and the like of the bidirectional gerotor pump are improved.

[0021] As preferred, the second forced lubrication channel comprises an annular oil groove arranged between the pump shell and the bearing seat, a throttle hole arranged on the pump shell and a second forced lubrication hole arranged in the bearing seat, the throttle hole being communicated with the oil groove and the second forced lubrication hole being communicated with the oil groove and the oil cavity in the bearing seat. On one hand, the flow rate and flow volume of the oil in the oil cavity into the oil groove can be reduced through the throttle hole, and the working efficiency of the bidirectional cycloid pump can be avoided from being affected by the excessive lubrication of the oil under the condition of ensuring the lubrication performance of the bearing between the pump shaft and the bearing seat; on the other hand, the second forced lubrication channel is formed by the annular oil groove, the throttle hole and the second forced lubrication hole, so that the throttle hole and the second forced lubrication hole can be connected through the annular oil groove, and the problem that the oil in the throttle hole cannot flow into the second forced lubrication hole smoothly due to the misplacement of the throttle hole and the second forced lubrication hole caused by the installation error or the machining error can be avoided.

[0022] As preferred, the inner wall of the pump body cavity towards the end face of the inner rotor is provided with a forced lubrication oil groove, and the forced lubrication oil groove constitutes the first forced lubrication channel. In this way, the actual processing and manufacturing of the first forced lubrication channel are facilitated.

[0023] The beneficial effects of the bidirectional cycloid pump are as follows: during the working process of the bidirectional cycloid pump, the bearings between the pump shaft and the pump shell and between the pump shaft and the pump cover can be automatically lubricated, so as to ensure the lubrication performance of the pump shaft. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a kind of axial section structure schematic diagram of the bidirectional cycloid pump of the utility model.

[0025] Figure 2 is Figure 1 A is a kind of local enlarged view in the.

[0026] Figure 3 is a kind of cross section structure schematic diagram of the bidirectional cycloid pump of the utility model.

[0027] In the drawing:

[0028] Pump shell 1, oil suction cavity 1.1, oil cavity 1.2, oil inlet 1.3, oil outlet 1.4;

[0029] Pump cover 2;

[0030] Rotary pump body 3;

[0031] Inner rotor 4;

[0032] Outer rotor 5;

[0033] Pump shell bearing 6;

[0034] Pump cover bearing 7, thrust bearing 7.1, pump cover sliding bearing 7.2;

[0035] Spring 8;

[0036] Annular oil cavity 9, first annular cavity 9.1, second annular cavity 9.2;

[0037] First forced lubrication channel 10;

[0038] Annular oil channel 11;

[0039] Axial oil channel 12;

[0040] Bearing seat 13;

[0041] Reinforced bearing 14;

[0042] Pump shaft 15, axial oil return hole 15.1;

[0043] In-seat oil cavity 16;

[0044] Throttle hole 17;

[0045] Annular oil groove 18;

[0046] Second forced lubrication hole 19;

[0047] Shaft end oil cavity 20. DETAILED DESCRIPTION

[0048] Specific embodiment one, as shown in Figure 1 、 Figure 2 、 Figure 3 A bidirectional cycloid pump convenient for lubrication comprises a pump shell 1, a pump cover 2, a pump body inner cavity, an inner rotor 4 and an outer rotor 5. The pump body inner cavity is formed between the pump shell 1 and the pump cover 2. The pump body inner cavity comprises an oil suction cavity 1.1 and an oil press cavity 1.2.

[0049] The inner rotor 4 is arranged in the pump body inner cavity through a pump shaft 15. The pump shaft 15 is provided with a pump cover bearing 7 between the pump cover 2. The pump shaft 15 is provided with a pump shell bearing 6 between the pump shell 1. The inner rotor 4 is provided with an annular oil channel 11 between the pump shell bearing 6. The inner rotor 4 is provided with an annular oil cavity 9 between the pump cover bearing 7. The pump shaft 15 is provided with an axial oil channel 12 between the inner rotor 4, which communicates the annular oil channel 11 and the annular oil cavity 9. The inner rotor 4 is provided with a first forced lubrication channel 10 between an end face and an inner wall of the pump body inner cavity. The first forced lubrication channel 10 communicates the oil press cavity 1.2 and the annular oil channel 11.

[0050] The specific work of the bidirectional cycloid pump convenient for lubrication in the embodiment is as follows,

[0051] In operation, the inner rotor 4 and the outer rotor 5 are driven to rotate by the pump shaft 15. In the process, the teeth of the inner rotor 4 and the outer rotor 5 gradually disengage in the oil suction chamber 1.1, increasing the sealed volume and forming a partial vacuum. Under the action of atmospheric pressure, oil enters the oil suction chamber 1.1. The inner rotor 4 and the outer rotor 5 successively engage and rotate, and oil is carried into the oil pressure chamber 1.2. At the same time, the gap between the teeth of the inner rotor 4 and the outer rotor 5 gradually decreases with rotation, and the oil pressure increases, so that the oil carried from the oil suction chamber 1.1 to the oil pressure chamber 1.2 is discharged from the oil outlet 1.4. Because the first forced lubrication channel 10 is provided between the one end surface of the inner rotor 4 and the inner wall of the pump body inner cavity, and the first forced lubrication channel 10 communicates the oil pressure chamber 1.2 and the annular oil channel 11, a small amount of oil flowing through the oil pressure chamber 1.2 enters the annular oil channel 11 through the first forced lubrication channel 10, and then enters the annular oil chamber 9 through the axial oil channel 12. The oil in the annular oil channel 11 enters the pump shaft 15 and the pump shell bearing 6 to lubricate the pump shell bearing 6. The oil in the annular oil chamber 9 enters the pump shaft 15 and the pump cover bearing 7 to lubricate the pump cover bearing 7. Thus, the bearings between the pump shaft 15 and the pump shell 1 and the bearings between the pump shaft 15 and the pump cover 2 are automatically lubricated during the operation of the bidirectional trochoid pump, the lubrication performance of the pump shaft 15 is ensured, and the transmission stability, service life, and working efficiency of the bidirectional trochoid pump are improved. On the other hand, the bidirectional trochoid pump is convenient to lubricate, uses the positive pressure of the oil pressure chamber 1.2 as a power source, and does not require additional power, and the oil supply is stable.

[0052] Specifically, as shown in Figure 1 、 Figure 2 、 Figure 3 A bidirectional trochoid pump convenient to lubricate includes a pump shell 1, a pump cover 2, a pump body inner cavity, an inner rotor 4, and an outer rotor 5. The inner rotor 4 is a gear, the outer rotor 5 is an inner ring gear, and the inner rotor 4 and the outer rotor 5 are engaged. The pump body inner cavity is formed between the pump shell 1 and the pump cover 2. The pump body inner cavity includes an oil suction chamber 1.1 and an oil pressure chamber 1.2. The pump shell 1 is provided with an oil inlet 1.3 and an oil outlet 1.4. The oil inlet 1.3 communicates with the oil suction chamber 1.1, and the oil outlet 1.4 communicates with the oil pressure chamber 1.2.

[0053] The inner rotor 4 is arranged in the pump body inner cavity through the pump shaft 15. In this embodiment, the inner rotor 4 and the pump shaft 15 are connected by a key. The pump shaft 15 and the pump cover 2 are provided with a pump cover bearing 7. The pump shaft 15 and the pump shell 1 are provided with a pump shell bearing 6. The inner rotor 4 and the pump shell bearing 6 are provided with an annular oil channel 11, which surrounds the pump shaft 15. The inner rotor 4 and the pump cover bearing 7 are provided with an annular oil chamber 9, which surrounds the pump shaft 15. The pump shaft 15 and the inner rotor 4 are provided with an axial oil channel 12, which communicates the annular oil channel 11 and the annular oil chamber 9.

[0054] The first forced lubrication passage 10 is arranged between the end surface of the inner rotor 4 and the inner wall of the inner cavity of the pump body. The first forced lubrication passage 10 is connected with the oil chamber 1.2 and the annular oil channel 11.

[0055] In one embodiment of the present embodiment, a forced lubrication oil groove is arranged on the inner wall of the inner cavity of the pump body and faces the end surface of the inner rotor 4, and the forced lubrication oil groove forms the first forced lubrication passage 10. In this way, the actual machining of the first forced lubrication passage 10 is facilitated.

[0056] In another embodiment of the present embodiment, a forced lubrication oil groove is arranged on the end surface of the rotor and faces away from the pump cover 2, and the forced lubrication oil groove forms the first forced lubrication passage 10.

[0057] The specific working process of the bidirectional cycloid pump of the present embodiment is as follows,

[0058] During the rotation of the inner rotor 4 and the outer rotor 5 driven by the pump shaft 15, the teeth of the inner rotor 4 and the outer rotor 5 gradually disengage and the sealing volume increases, forming a local vacuum, and the oil enters the oil suction chamber 1.1 under the action of atmospheric pressure; the inner rotor 4 and the outer rotor 5 successively engage and rotate, and the oil is carried into the oil pressure chamber 1.2, and at the same time, the gap between the teeth of the inner rotor 4 and the outer rotor 5 gradually decreases with the rotation, and the oil pressure increases, so that the oil carried from the oil suction chamber 1.1 to the oil pressure chamber 1.2 is discharged from the oil outlet 1.4. Since the first forced lubrication passage 10 is arranged between the end surface of the inner rotor 4 and the inner wall of the inner cavity of the pump body, and the first forced lubrication passage 10 is connected with the oil pressure chamber 1.2 and the annular oil channel 11, a small amount of oil will flow through the first forced lubrication passage 10 into the annular oil channel 11 when the oil flows through the oil pressure chamber 1.2, and then enters the annular oil chamber 9 through the axial oil channel 12, wherein the oil in the annular oil channel 11 enters the pump shaft 15 and the pump shell bearing 6 to lubricate the pump shell bearing 6; the oil in the annular oil chamber 9 enters the pump shaft 15 and the pump cover bearing 7 to lubricate the pump cover bearing 7, thereby automatically lubricating the bearings between the pump shaft 15 and the pump shell 1 and the bearings between the pump shaft 15 and the pump cover 2 during the working process of the bidirectional cycloid pump, ensuring the lubrication performance of the pump shaft 15 and improving the transmission stability, service life, working efficiency, etc. of the bidirectional cycloid pump. On the other hand, the bidirectional cycloid pump is powered by the positive pressure of the oil pressure chamber 1.2, without the need for additional power, and the oil supply is stable.

[0059] Specifically, as shown in FIG. 1, Figure 1 , Figure 2As shown in the figure, the bidirectional gerotor pump convenient for lubrication further comprises a rotating pump body 3 arranged in the inner cavity of the pump body. The pump shell 1 and the pump cover 2 are connected by bolts, and a sealing ring is arranged between the pump shell 1 and the pump cover 2. The inner rotor 4 and the outer rotor 5 are arranged in the rotating pump body 3. The rotating pump body 3 is provided with a shaft through hole. The shaft through hole is located between the pump cover bearing 7 and the inner rotor 4. The pump shaft 15 passes through the shaft through hole.

[0060] The annular oil cavity 9 comprises a first annular cavity 9.1, a second annular cavity 9.2 and a communication oil channel. The first annular cavity 9.1 is formed between the inner rotor 4 and the rotating pump body 3 and is arranged around the pump shaft 15. The second annular cavity 9.2 is formed between the rotating pump body 3 and the pump cover bearing 7 and is arranged around the pump shaft 15. The communication oil channel is arranged between the shaft through hole and the pump shaft 15. In this way, during the operation of the bidirectional gerotor pump, the oil in the annular oil channel 11 will first enter the first annular cavity 9.1 through the axial oil channel 12, then enter the second annular cavity 9.2 through the communication oil channel, and the oil in the second annular cavity 9.2 enters the pump shaft 15 and the pump cover bearing 7 to lubricate the pump cover bearing 7.

[0061] In this embodiment, a gap is arranged between the shaft through hole and the pump shaft 15, and the gap constitutes the communication oil channel. The shaft through hole and the pump shaft 15 are coaxially distributed. In this way, on the one hand, the pump shaft 15 can avoid contacting the shaft through hole, and on the other hand, the communication oil channel can be formed in the gap between the shaft through hole and the pump shaft 15, which is convenient for the actual processing and manufacturing of the communication oil channel.

[0062] In this embodiment, the pump cover bearing 7 comprises a thrust bearing 7.1 and a pump cover sliding bearing 7.2, and the pump cover sliding bearing 7.2 is located between the thrust bearing 7.1 and the pump cover 2. In this way, the stability of the rotating connection between the pump shaft 15 and the pump cover 2 can be effectively improved. It should be noted that this is only one embodiment of the pump cover bearing 7, and the pump cover bearing 7 can also be composed of other bearings, such as oil-containing bearings or ball bearings. The number of pump cover bearings 7 can also be one or more according to needs.

[0063] The pump shell bearing 6 is composed of a pump shell sliding bearing. In this way, the space occupied by the pump shell sliding bearing in the pump shell 1 can be effectively reduced, enough space is left for arranging the oil inlet 1.3 and the oil outlet 1.4 on the pump shell 1, thereby reducing the volume of the pump shell 1. It should be noted that the pump shell bearing 6 can also be composed of other bearings, such as oil-containing bearings or ball bearings. The number of pump shell bearings 6 can also be one or more according to needs.

[0064] Further, as shown in the figure, Figure 1As shown in the figure, the bidirectional gerotor pump convenient for lubrication further comprises a spring 8. The spring 8 is sleeved on the pump shaft 15. The spring 8 is arranged between the rotating pump body 3 and the pump cover bearing 7. The spring 8 provides elastic force to make the rotating pump body 3 abut against the end faces of the inner rotor 4 and the outer rotor 5. One end of the spring 8 abuts against the thrust bearing 7.1, and the other end of the spring 8 abuts against the rotating pump body 3. The rotating pump body 3 abuts against the end faces of the inner rotor 4 and the outer rotor 5 under the action of the spring 8, which can prevent too large gap from being formed between the rotating pump body 3 and the pump shell 1; on the other hand, when the direction of the power source changes, the rotating pump body 3 can rotate without jamming and can rotate together with the pump cover bearing 7, thereby reducing the frictional resistance suffered by the rotating pump body 3 during rotation.

[0065] Further, as shown in the figure, Figure 1 The pump shaft 15 end face and the pump cover 2 are provided with an axial oil chamber 20. The lubricating oil between the pump cover bearing 7 and the pump shaft 15 can enter the axial oil chamber 20. The pump shaft 15 is provided with an axial oil return hole 15.1. One end of the axial oil return hole 15.1 communicates with the axial oil chamber 20, and the other end of the axial oil return hole 15.1 communicates with the end of the pump shaft 15 away from the pump cover 2. In this way, during the operation of the bidirectional gerotor pump, the oil in the annular oil chamber 9 enters between the pump shaft 15 and the pump cover bearing 7, lubricates the pump cover bearing 7, and then enters the axial oil chamber 20. Then the oil returns to the gear box through the axial oil return hole 15.1, forming a circulation of lubricating oil, which is conducive to the continuous entry of oil between the pump shaft 15 and the pump cover bearing 7, lubricating the pump cover bearing 7, and ensuring the lubrication effect of the pump cover bearing 7.

[0066] Specifically, as shown in the figure, Figure 1 The bidirectional gerotor pump convenient for lubrication further comprises a bearing seat 13 arranged on the pump shell 1. The bearing seat 13 and the pump cover 2 are located on opposite sides of the pump shell 1. The bearing seat 13 is coaxially arranged with the pump shaft 15. The bearing seat 13 and the pump shell 1 are connected by bolts. The pump shaft 15 passes through the bearing seat 13. The pump shaft 15 and the bearing seat 13 are provided with a reinforcing bearing 14. This scheme is suitable for the case that the pump shaft 15 is long. The bearing seat 13 and the reinforcing bearing 14 support the pump shaft 15 extending out of the pump shell 1, so as to ensure that the pump shaft 15 is uniformly stressed.

[0067] In this embodiment, the reinforcing bearing 14 is two. The reinforcing bearing 14 is a thrust ball bearing. It should be noted that this is only one embodiment of the reinforcing bearing 14. The reinforcing bearing 14 can also be composed of other bearings, such as oil-containing bearings or ball bearings. The number of reinforcing bearings 14 can also be one or more according to needs.

[0068] Further, as shown in the figure, Figure 1As shown, the bearing seat 13 is provided with an oil cavity 16 around the pump shaft 15, and the oil cavity 16 is located between the pump shell 1 and the reinforced bearing 14. The pump shell 1 is provided with a second forced lubrication channel, and the second forced lubrication channel is communicated with the oil cavity 16 and the pressure oil cavity 1.2. In this way, during the operation of the bidirectional cycloid pump, a small amount of oil will enter the oil cavity 16 through the second forced lubrication channel when the oil flows through the pressure oil cavity 1.2, and the oil in the oil cavity 16 enters between the pump shaft 15 and the reinforced bearing 14 to lubricate the reinforced bearing 14, thereby realizing automatic lubrication of the bearing between the pump shaft 15 and the bearing seat 13 during the operation of the bidirectional cycloid pump, ensuring the lubrication performance of the pump shaft 15, and improving the transmission stability, service life, working efficiency and the like of the bidirectional cycloid pump.

[0069] Further, as shown in the drawings, Figure 1 The second forced lubrication channel includes an annular oil groove 18 arranged between the pump shell 1 and the bearing seat 13, a throttle hole 17 arranged on the pump shell 1, and a second forced lubrication hole 19 arranged in the bearing seat 13. The throttle hole 17 is communicated with the annular oil groove 18 and the pressure oil cavity 1.2, and the second forced lubrication hole 19 is communicated with the annular oil groove 18 and the oil cavity 16. On the one hand, the second forced lubrication channel can reduce the flow rate and flow of the oil in the pressure oil cavity 1.2 entering the annular oil groove 18 through the throttle hole 17, and on the other hand, the second forced lubrication channel is formed by the annular oil groove 18, the throttle hole 17 and the second forced lubrication hole 19, so that the annular oil groove 18 can connect the throttle hole 17 and the second forced lubrication hole 19, and ensure that the throttle hole 17 and the second forced lubrication hole 19 can be communicated, thereby avoiding the problem that the oil in the throttle hole 17 cannot flow smoothly into the second forced lubrication hole 19 due to installation error or machining error.

[0070] The above is only a preferred embodiment of the present application, and does not limit the present application in any way. Any simple modification, change and equivalent transformation of the above embodiment according to the technical essence of the present application still belongs to the protection scope of the technical scheme of the present application.

Claims

1. A bidirectional gerotor pump with facilitated lubrication, comprising: a pump housing and a pump cover; a pump body cavity including an oil suction chamber and an oil pressure chamber; an inner rotor and an outer rotor, the inner rotor being arranged in the pump body cavity through a pump shaft, a pump cover bearing being arranged between the pump shaft and the pump cover, and a pump housing bearing being arranged between the pump shaft and the pump housing, characterized in that an annular oil passage is arranged between the inner rotor and the pump housing bearing, an annular oil chamber is arranged between the inner rotor and the pump cover bearing, an axial oil passage is arranged between the pump shaft and the inner rotor to communicate the annular oil passage and the annular oil chamber, and a first forced lubrication passage is arranged between an end surface of the inner rotor and an inner wall of the pump body cavity facing the end surface of the inner rotor, the first forced lubrication passage communicating the oil pressure chamber and the annular oil passage.

2. A bi-directional gerotor pump for ease of lubrication as claimed in claim 1, wherein, Further comprising a rotating pump body arranged in the pump body cavity, the inner rotor and the outer rotor being arranged in the rotating pump body, the rotating pump body being provided with a shaft through hole, the shaft through hole being located between the pump cover bearing and the inner rotor, the pump shaft passing through the shaft through hole, the annular oil chamber including: a first annular cavity formed between the inner rotor and the rotating pump body and arranged around the pump shaft; a second annular cavity formed between the rotating pump body and the pump cover bearing and arranged around the pump shaft; a communication oil passage arranged between the shaft through hole and the pump shaft.

3. A bi-directional gerotor pump for ease of lubrication according to claim 2, characterized in that A gap is arranged between the shaft through hole and the pump shaft, and the gap constitutes the communication oil passage.

4. A bi-directional gerotor pump for ease of lubrication according to claim 2 or 3, characterised in that, Further comprising a spring, the spring being sleeved on the pump shaft, the spring being arranged between the rotating pump body and the pump cover bearing, and the spring providing an elastic force to make the rotating pump body abut against the end surfaces of the inner rotor and the outer rotor.

5. A bi-directional gerotor pump for ease of lubrication as claimed in claim 4, wherein, The pump cover bearing includes a thrust bearing, one end of the spring abutting against the thrust bearing, and the other end of the spring abutting against the rotating pump body.

6. A bi-directional gerotor pump for ease of lubrication as claimed in claim 1 or 2 or 3 wherein, An axial oil chamber is arranged between an end surface of the pump shaft and the pump cover, lubricating oil between the pump cover bearing and the pump shaft can enter the axial oil chamber, an axial oil return hole is arranged in the pump shaft, one end of the axial oil return hole communicating with the axial oil chamber, and the other end of the axial oil return hole communicating with an end portion of the pump shaft away from the pump cover.

7. A bi-directional gerotor pump for ease of lubrication as claimed in claim 1 or 2 or 3 wherein, Further comprising a bearing seat arranged on the pump housing, the bearing seat and the pump cover being located on opposite sides of the pump housing, the pump shaft passing through the bearing seat, and a reinforcing bearing being arranged between the pump shaft and the bearing seat.

8. A bi-directional gerotor pump for ease of lubrication according to claim 7, characterized in that An inner seat oil chamber is arranged in the bearing seat and arranged around the pump shaft, the inner seat oil chamber being located between the pump housing and the reinforcing bearing, a second forced lubrication passage is arranged on the pump housing and communicates the oil pressure chamber and the inner seat oil chamber.

9. A bi-directional gerotor pump for ease of lubrication according to claim 8, characterized in that The second forced lubrication passage includes an annular oil groove arranged between the pump housing and the bearing seat, a throttling hole arranged on the pump housing, and a second forced lubrication hole arranged in the bearing seat, the throttling hole communicating the oil pressure chamber and the annular oil groove, and the second forced lubrication hole communicating the annular oil groove and the inner seat oil chamber.

10. A bi-directional gerotor pump for ease of lubrication as claimed in claim 1 or 2 or 3 wherein, A forced lubrication oil groove is arranged on an inner wall of the pump body cavity facing an end surface of the inner rotor, and the forced lubrication oil groove constitutes the first forced lubrication passage.

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