Bidirectional internal gear pump with backlash compensation function

Abstract

The invention provides a bidirectional internal gear pump with a clearance compensation function, the bidirectional internal gear pump comprises a gear pump body, a gear pair, a radial clearance compensation assembly and an axial clearance compensation assembly, the gear pair comprises an internal gear and an external gear, and the radial clearance compensation assembly comprises a main crescent plate and two auxiliary crescent plates; the outer arc section of the main crescent-shaped plate is convexly provided with a protrusion, the inner arc section of each auxiliary crescent-shaped plate is concavely provided with a groove, the protrusion is connected into the groove, and the axial clearance compensation assembly comprises two floating side plates which are oppositely arranged on the two sides of the gear pair in the axial direction. In this way, when oil enters, stress high-pressure areas of the main crescent plate and the auxiliary crescent plate are opened to be tightly attached to tooth crests of the inner gear and tooth crests of the outer gear respectively, the low-pressure side of the auxiliary crescent plate gets close and is tightly attached to the protrusion of the main crescent plate for extrusion, and therefore the radial clearance compensation effect is achieved, and the floating side plate is tightly attached to the end face of the gear pair under back pressure to form axial clearance compensation so as to reduce the axial clearance. Therefore, the bidirectional clearance compensation effect is achieved, and the service life of the gear pump is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of internal gear pumps, in particular to a bidirectional internal gear pump with a clearance compensation function. Background Art

[0002] The internal gear pump has a compact structure and small size, and the internal contact structure of the gear and the gear ring makes the contact point longer, so it has a better sealing effect and a larger suction and discharge pressure angle, which leads to lower noise, smaller flow pulsation and better oil absorption capacity. The internal gear pump has obvious advantages and is widely used in various industries where high-pressure pumps are needed.

[0003] However, due to the accumulation of usage time, the gear pair is prone to wear, so it is necessary to adopt measures to compensate for the clearance to ensure the effect of the equipment. The radial clearance compensation component of the internal gear pump in the prior art usually needs to use a crescent plate in conjunction with other components, and its structure is complex. Sometimes it will get stuck and cause the gear pump to fail, thereby affecting the effect of the equipment. In this way, subsequent maintenance is frequent, increasing economic costs.

[0004] In view of this, it is necessary to propose a bidirectional internal gear pump with a clearance compensation function to solve or at least alleviate the above-mentioned defects. Summary of the invention

[0005] The main purpose of the present invention is to provide a bidirectional internal gear pump with a clearance compensation function to solve the problem in the prior art that the radial clearance compensation component has a complex structure and is prone to jamming, resulting in gear pump failure.

[0006] To achieve the above-mentioned object, the present invention provides a bidirectional internal gear pump with a clearance compensation function, comprising a gear pump body, a gear pair, a radial clearance compensation component and an axial clearance compensation component arranged in the gear pump body, the gear pair comprising an internal gear and an external gear, and an eccentric internal meshing arrangement between the internal gear and the external gear; wherein,

[0007] The radial clearance compensation assembly includes a main crescent plate and two auxiliary crescent plates, the inner arc section of the main crescent plate is arranged to abut against the outer ring teeth of the inner gear, the two auxiliary crescent plates are arranged along the central axis of the main crescent plate on one side of the outer arc section of the main crescent plate, and the outer arc section of the auxiliary crescent plate is arranged to abut against the inner ring teeth of the outer gear;

[0008] The outer arc section of the main crescent plate is convexly provided with a synapse, and the inner arc section of each auxiliary crescent plate is concavely provided with a groove matched with the synapse, the synapse is connected to the groove, and the outer arc section of the main crescent plate is concavely provided inwardly to form an oil guide chamber between the inner arc section of the auxiliary crescent plate;

[0009] The axial clearance compensation component includes two floating side plates arranged opposite to each other in the axial direction, the two floating side plates are connected to both sides of the gear pair, and each of the floating side plates is provided with a side plate shaft hole for the motor shaft to pass through and an oil hole for the oil to enter and exit.

[0010] Preferably, the number of the synapses is two, and the two synapses are relatively convexly arranged on the outer arc segment of the main crescent plate along the central axis of the main crescent plate, and each inner arc segment of the secondary crescent plate is correspondingly provided with a groove, and the two synapses are respectively connected to the grooves of the two secondary crescent plates.

[0011] Preferably, the gear pump body includes a pump body and a pump cover, the gear pair, the radial clearance compensation assembly and the axial clearance compensation assembly are all arranged in the pump body, the pump cover is connected to the top of the pump body, and the pump cover has an oil inlet and an oil outlet, and a pump body shaft hole coaxially arranged with the side plate shaft hole is opened at the bottom of the pump body.

[0012] Preferably, it also includes an ear-shaped sealing ring, which is correspondingly arranged at the oil hole, and the ear-shaped sealing ring located above is connected between the pump cover and the upper floating side plate, and the ear-shaped sealing ring located below is connected between the bottom end of the pump body and the lower floating side plate.

[0013] Preferably, two stop pins are also included, and the middle part of the main crescent plate is recessed inward along both sides of the axial direction to form a stop groove, and each of the floating side plates is provided with a mounting hole for the stop pin to pass through, and the stop pin passes through the mounting hole and extends into the stop groove to be connected.

[0014] Preferably, the synapse is in an arc shape, and the groove is matched to be in an arc shape.

[0015] Preferably, a dovetail groove is further provided on the floating side plate, and the dovetail groove is arranged opposite to the oil guide chamber.

[0016] Preferably, it also includes a lubricating sleeve, which is connected at the side plate shaft hole of the upper floating side plate and between the side plate shaft hole of the lower floating side plate and the pump body shaft hole.

[0017] Preferably, the arc width of the groove is greater than the arc width of the synapse.

[0018] Preferably, it further comprises a bushing, which is sleeved on the outer side of the external gear.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a bidirectional internal meshing gear pump with a clearance compensation function, comprising a gear pump body, a gear pair, a radial clearance compensation component and an axial clearance compensation component, the gear pair comprising an internal gear and an external gear, the internal gear and the external gear being eccentrically internally meshed, the radial clearance compensation component comprising a main crescent plate and two auxiliary crescent plates, the inner arc segment of the main crescent plate being arranged to abut against the outer ring teeth of the internal gear, the two auxiliary crescent plates being arranged on one side of the outer arc segment of the main crescent plate along the central axis of the main crescent plate, and the outer arc segment of the auxiliary crescent plate being arranged to abut against the outer ring teeth of the internal gear, The inner ring teeth are arranged to abut against each other, the outer arc segment of the main crescent plate is convex to form a synapse, the inner arc segment of each auxiliary crescent plate is concave to form a groove matched with the synapse, the synapse is connected to the groove, and the outer arc segment of the main crescent plate is concave inward to form an oil guide chamber with the inner arc segment of the auxiliary crescent plate. The axial clearance compensation assembly includes two floating side plates arranged axially opposite to each other, the two floating side plates are connected to both sides of the gear pair, and each floating side plate is provided with a side plate shaft hole for the motor shaft to pass through and an oil through hole for the oil to enter and exit. In this way, when the oil enters, the high-pressure areas of the main and auxiliary crescent plates are opened and pressed against the tooth tops of the inner and outer gears respectively, and the low-pressure side of the auxiliary crescent plate is brought closer and pressed against the synapse of the main crescent plate for squeezing, thereby achieving the effect of radial clearance compensation, avoiding the problem of equipment failure caused by the traditional elastic element compensation clearance being stuck, and the floating side plate is pressed against the end face of the gear pair under back pressure to form axial clearance compensation to reduce the axial clearance. In this way, it has a two-way clearance compensation effect, which extends the service life of the gear pump, and is simple to assemble and easy to maintain, further improving the economy of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the explosion of the assembly inside the pump body in one embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of assembling a radial clearance compensation component in one embodiment of the present invention;

[0024] Figure 3 is a schematic plan view of a radial clearance compensation component in one embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of assembling a floating side plate and an ear-shaped sealing ring in one embodiment of the present invention;

[0026] Figure 5 It is a three-dimensional schematic diagram of an embodiment of the present invention after the pump cover is removed;

[0027] Figure 6 It is a three-dimensional schematic diagram of the overall structure of one embodiment of the present invention;

[0028] Figure 7 A cross-sectional schematic diagram of the overall structure of an embodiment of the present invention;

[0029] Figure 8 It is a three-dimensional schematic diagram from another perspective of the overall structure in one embodiment of the present invention.

[0030] Fig. 9 It is a schematic diagram of the assembly of a stop pin in one embodiment of the present invention.

[0031] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

[0032] Description of Figure Numbers:

[0033] 10. Radial clearance compensation assembly; 110. Main crescent plate; 111. Synapse; 112. Oil guide chamber; 113. Stop groove; 120. Secondary crescent plate; 121. Groove; 20. Axial clearance compensation assembly; 210. Floating side plate; 211. Side plate shaft hole; 212. Oil through hole; 213. Mounting hole; 214. Dovetail groove; 220. Ear-type sealing ring; 30. Gear pair; 310. Internal gear; 320. External gear; 40. Gear pump body; 410. Pump body; 411. Pump body shaft hole; 420. Pump cover; 421. Oil inlet; 422. Oil outlet; 430. Stop pin; 440. Lubricating sleeve; 450. Bushing. DETAILED DESCRIPTION

[0034] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

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

[0036] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Please refer to the attached Figure 1-9 In one embodiment of the present invention, a bidirectional internal gear pump with a clearance compensation function includes a gear pump body 40 and a gear pair 30, a radial clearance compensation component 10 and an axial clearance compensation component 20 arranged in the gear pump body 40, wherein the gear pair 30 includes an internal gear 310 and an external gear 320, and an eccentric internal meshing arrangement is provided between the internal gear 310 and the external gear 320. First of all, it should be noted that the axial direction in the present application refers to the axial direction of the gear (the extension direction of the electric shaft); which is different from the radial clearance compensation component 10 of the internal gear pump in the prior art, which usually requires a crescent plate to cooperate with other components, has a complex structure, and sometimes gets stuck and causes the gear pump to fail, thereby affecting the equipment effect, so that the subsequent maintenance is frequent, which increases the economic cost. The present application solves the above-mentioned defects in the prior art by providing a bidirectional internal gear pump with a clearance compensation function, as follows:

[0039] The radial clearance compensation component 10 includes a main crescent plate 110 and two auxiliary crescent plates 120. The inner arc section of the main crescent plate 110 is arranged to abut against the outer ring teeth of the inner gear 310. The two auxiliary crescent plates 120 are arranged relatively on one side of the outer arc section of the main crescent plate 110 along the central axis of the main crescent plate 110, and the outer arc section of the auxiliary crescent plate 120 is arranged to abut against the inner ring teeth of the outer gear 320. The outer arc section of the main crescent plate 110 is convexly formed with a synapse 111, and the inner arc section of each auxiliary crescent plate 120 is concave to form a synapse 111. The synapse 111 is matched with a groove 121, the synapse 111 is connected to the groove 121, and the outer arc segment of the main crescent plate 110 is recessed inward to form an oil guide chamber 112 with the inner arc segment of the auxiliary crescent plate 120; the axial clearance compensation component 20 includes two floating side plates 210 arranged opposite to each other in the axial direction, the two floating side plates 210 are connected to the two sides of the gear pair 30, and each of the floating side plates 210 is provided with a side plate shaft hole 211 for the motor shaft to pass through and an oil through hole 212 for the oil to enter and exit.

[0040] Specifically, the bidirectional internal gear pump with clearance compensation function in the present application includes a gear pump body 40, a gear pair 30, a radial clearance compensation component 10 and an axial clearance compensation component 20. The gear pump body 40 is used for installation of other parts. As the entire bearing body, in a preferred embodiment, it may specifically include a pump body 410 and a pump cover 420. The pump body 410 is used for installation of the gear pair 30, the radial clearance compensation component 10 and the axial clearance compensation component 20. The pump cover 420 is connected to the pump body 410 to cover the pump body 410 to form a sealing device. It can be understood that the pump cover 420 has an oil inlet 421 and an oil outlet 422 to respectively connect The pump body 410 has an oil inlet chamber and an oil outlet chamber, and a pump body shaft hole 411 is opened at the bottom of the pump body 410 to allow the motor shaft to pass through, so that the gear pair 30 is driven to rotate by the rotation of the motor shaft; the gear pair 30 includes an outer gear 320 and an inner gear 310, and the outer gear 320 and the inner gear 310 are eccentrically meshed to form an offset gap, and the offset gap is used for the installation of the radial clearance compensation component 10, so that the radial clearance compensation component 10 is tightly squeezed to compensate for the radial wear clearance between the outer gear 320 and the inner gear 310; the axial clearance compensation component 20 is used to compensate for the clearance difference of the gear pump along the axial direction, so as to have a two-way compensation effect, thereby greatly extending the service life of the equipment.

[0041] Wherein, the radial clearance compensation component 10 includes a main crescent plate 110 and two auxiliary crescent plates 120, the inner arc segment of the main crescent plate 110 is set to abut against the outer ring teeth of the inner gear 310, and the outer arc segment of the auxiliary crescent plate 120 is set to abut against the inner ring teeth of the outer gear 320, so that the main crescent plate 110 and the auxiliary crescent plate 120 are set between the inner gear 310 and the outer gear 320, and the two auxiliary crescent plates 120 are set to make radial clearance compensation from both ends of the main crescent plate 110 respectively to ensure uniform force and compensation effect, so the two auxiliary crescent plates 120 are arranged relatively along the central axis of the main crescent plate 110; preferably, the traditional compensation form of using sealing strips and elastic parts is abandoned, and the present application is provided with a convex shape on the outer arc segment of the main crescent plate 110. A synapse 111 is formed, and a groove 121 matching the synapse 111 is formed in the inner arc section of each of the secondary crescent plates 120, so that the synapse 111 is connected to the groove 121. In this way, when oil enters, the high-pressure areas of the primary and secondary crescent plates 120 are opened and tightly pressed against the tooth tops of the inner and outer gears 320 respectively, and the low-pressure side of the secondary crescent plate 120 is close to and pressed against the synapse 111 of the main crescent plate 110 for compression, thereby achieving the effect of radial clearance compensation; and because the gears move in the circumferential direction when meshing in and out, the present application, as a preferred embodiment, also sets the synapse 111 in an arc shape to facilitate matching the force mode of the movement mode, so that the force is more uniform when compensating for the radial clearance, and the compensation effect is better. At the same time, in order to facilitate the installation of the arc-shaped synapse 111, the groove 121 is also set in an arc shape.

[0042] Furthermore, the outer arc segment of the main crescent plate 110 is recessed inwardly to form an oil guide chamber 112 between the inner arc segment of the auxiliary crescent plate 120. The oil guide chamber 112 is used to facilitate the entry of oil so as to quickly achieve the effect of opening the high-pressure areas of the main and auxiliary crescent plates 120 and bringing the low-pressure sides of the auxiliary crescent plate 120 closer to and close to the synapse 111, so as to improve the efficiency of radial clearance compensation; and the axial clearance compensation component 20 includes two floating side plates 210 arranged opposite to each other in the axial direction, so as to compensate for the axial clearance from the upper and lower sides of the axial direction respectively. The floating side plates 210 are subjected to pressure to be close to the upper and lower end surfaces of the gear pair 30 respectively, so as to achieve the effect of axial clearance compensation. It can be understood that in order not to affect the entry and exit of oil and the through connection of the motor shaft, a side plate shaft hole 211 for the motor shaft to pass through and an oil through hole 212 for the entry and exit of oil need to be opened on the floating side plate 210.

[0043] As a preferred embodiment of the present invention, the number of the synapses 111 is two, and the two synapses 111 are relatively protruded on the outer arc segment of the main crescent plate 110 along the central axis of the main crescent plate 110, and each inner arc segment of the secondary crescent plate 120 is correspondingly provided with a groove 121, and the two synapses 111 are respectively connected to the grooves 121 of the two secondary crescent plates 120.

[0044] It should be noted that in order to ensure uniform radial clearance compensation effect, the number of synapses 111 on the main crescent plate 110 is two, so that each of the auxiliary crescent plates 120 has a corresponding synapse 111 to be close and tightly attached. Therefore, a groove 121 is correspondingly provided in the inner arc segment of each auxiliary crescent plate 120, thereby correspondingly connecting the synapses 111.

[0045] As a preferred embodiment of the present invention, it also includes an ear-shaped sealing ring 220, which is correspondingly arranged at the oil hole 212, and the ear-shaped sealing ring 220 located above is connected between the pump cover 420 and the upper floating side plate 210, and the ear-shaped sealing ring 220 located below is connected between the bottom end of the pump body 410 and the lower floating side plate 210.

[0046] It is worth mentioning that the ear-shaped sealing ring 220 is used to prevent oil leakage to ensure that the oil can only enter and exit from the oil hole 212 and will not leak to other positions of the floating side plate 210. Therefore, its corresponding enclosure is arranged at the oil hole 212, and the upper ear-shaped sealing ring 220 is fixed between the upper floating side plate 210 and the pump cover 420, while the lower ear-shaped sealing ring 220 is fixed between the lower floating side plate 210 and the bottom end of the pump body 410; it is worth mentioning that in this way, under the action of the pump cover 420 and the bottom of the pump body 410, a pre-compression force will be applied to the ear-shaped sealing ring 220, and this pre-compression force will also drive the floating side plate 210 to be close to the upper and lower end faces of the gear pair 30 to further ensure the effect of axial clearance compensation.

[0047] As a preferred embodiment of the present invention, it also includes two stop pins 430, and the middle part of the main crescent plate 110 is recessed inward along both sides of the axial direction to form a stop groove 113, and each of the floating side plates 210 is provided with a mounting hole 213 for the stop pin 430 to pass through, and the stop pin 430 passes through the mounting hole 213 and extends into the stop groove 113 to be connected thereto.

[0048] It is worth noting that the stop pin 430 is used to fix the main crescent plate 110 to prevent the main crescent plate 110 from deviating and rotating. Therefore, the middle part of the main crescent plate 110 is recessed inward along the axial direction on both sides to form a stop groove 113 for the stop pin 430 to be installed and connected. Considering that there are floating side plates 210 on both sides of the end surface, it is also necessary to open a mounting hole 213 for the stop pin 430 to pass through on the floating side plate 210, so that the two stop pins 430 pass through the upper and lower mounting holes 213 from top to bottom and extend into the corresponding stop groove 113, and the protruding position is just set between the two auxiliary crescent plates 120. For details, please refer to the attached Figure 1 and attached Fig. 9 .

[0049] Furthermore, a dovetail groove 214 is formed on the floating side plate 210 , and the dovetail groove 214 is arranged opposite to the oil guide chamber 112 .

[0050] It should be understood that the dovetail groove 214 can facilitate part of the high-pressure oil to quickly enter the oil guide chamber 112 between the primary crescent plate 110 and the secondary crescent plate 120 to achieve the radial clearance compensation function, thereby improving the efficiency of the radial clearance compensation.

[0051] Furthermore, it also includes a lubricating sleeve 440, which is connected at the side plate shaft hole 211 of the upper floating side plate 210 and between the side plate shaft hole 211 of the lower floating side plate 210 and the pump body shaft hole 411.

[0052] It should be noted that the lubricating sleeve 440 is used to reduce wear to increase service life. The lubricating sleeve 440 located at the side plate shaft hole 211 of the upper floating side plate 210 is used to protect the motor shaft portion between the upper floating side plate 210 and the pump cover 420, while the lubricating sleeve 440 located between the side plate shaft hole 211 of the lower floating side plate 210 and the pump body shaft hole 411 is used to protect the electric shaft portion between the lower floating side plate 210 and the bottom of the pump body 410.

[0053] Furthermore, the arc width of the groove 121 is greater than the arc width of the synapse 111 .

[0054] It should be noted that this allows for a certain amount of room for movement between the synapse 111 and the groove 121 when they are squeezed and pressed together, thereby improving the adaptability of the device, avoiding damage to components due to excessive squeezing, and extending the life of the device.

[0055] Furthermore, a bushing 450 is included, and the bushing 450 is sleeved on the outer side of the external gear 320 .

[0056] It can be understood that the bushing 450 is used to reduce the wear of the outer side of the outer gear 320 to increase the service life of the component, so it is sleeved on the outer side of the outer gear 320.

[0057] To facilitate the understanding of those skilled in the art, the working process of this device is briefly described as follows:

[0058] When the motor shaft rotates, the inner gear 310 drives the outer gear 320 to rotate, forming a reciprocating periodically changing volume cavity, thereby establishing oil pressure. The pressure causes the oil to enter the oil guide chamber 112 through the dovetail groove 214 on the floating side plate 210 and the gap between the main crescent plate 110 and the auxiliary crescent plate 120. The high-pressure areas of the main crescent plate 110 and the auxiliary crescent plate 120 are opened and pressed against the tooth tops of the inner gear 310 and the outer gear 320 respectively, and the low-pressure side of the auxiliary crescent plate 120 is close to and pressed against the synapse 111 of the main crescent plate 110 for sealing, thereby achieving the effect of radial clearance compensation, and the floating side plate 210 is pressed against the end face of the gear pair 30 under back pressure to form axial clearance compensation.

[0059] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A bidirectional internal gear pump with clearance compensation function, characterized in that: The invention comprises a gear pump body, a gear pair, a radial clearance compensation component and an axial clearance compensation component arranged in the gear pump body, wherein the gear pair comprises an internal gear and an external gear, and the internal gear and the external gear are eccentrically meshed with each other; wherein: The radial clearance compensation assembly includes a main crescent plate and two auxiliary crescent plates, the inner arc section of the main crescent plate is arranged to abut against the outer ring teeth of the inner gear, the two auxiliary crescent plates are arranged along the central axis of the main crescent plate on one side of the outer arc section of the main crescent plate, and the outer arc section of the auxiliary crescent plate is arranged to abut against the inner ring teeth of the outer gear; The outer arc section of the main crescent plate is convexly provided with a synapse, and the inner arc section of each auxiliary crescent plate is concavely provided with a groove matched with the synapse, the synapse is connected to the groove, and the outer arc section of the main crescent plate is concavely provided inwardly to form an oil guide chamber between the inner arc section of the auxiliary crescent plate; The axial clearance compensation component includes two floating side plates arranged opposite to each other in the axial direction, the two floating side plates are connected to both sides of the gear pair, and each of the floating side plates is provided with a side plate shaft hole for the motor shaft to pass through and an oil hole for the oil to enter and exit.

2. The bidirectional internal gear pump with clearance compensation function according to claim 1, characterized in that: There are two synapses, which are relatively convexly arranged on the outer arc section of the main crescent along the central axis of the main crescent, and each inner arc section of the auxiliary crescent is correspondingly provided with a groove, and the two synapses are respectively connected to the grooves of the two auxiliary crescents.

3. The bidirectional internal gear pump with clearance compensation function according to claim 1, characterized in that: The gear pump body includes a pump body and a pump cover. The gear pair, the radial clearance compensation assembly and the axial clearance compensation assembly are all arranged in the pump body. The pump cover is connected to the top of the pump body, and the pump cover has an oil inlet and an oil outlet. A pump body shaft hole coaxially arranged with the side plate shaft hole is opened at the bottom of the pump body.

4. The bidirectional internal gear pump with clearance compensation function according to claim 3, characterized in that: It also includes an ear-shaped sealing ring, which is correspondingly arranged at the oil hole, and the ear-shaped sealing ring located above is connected between the pump cover and the upper floating side plate, and the ear-shaped sealing ring located below is connected between the bottom end of the pump body and the lower floating side plate.

5. The bidirectional internal gear pump with clearance compensation function according to claim 3, characterized in that: It also includes two stop pins, and the middle part of the main crescent plate is recessed inward along both sides of the axial direction to form a stop groove, and each floating side plate is provided with a mounting hole for the stop pin to pass through, and the stop pin passes through the mounting hole and extends into the stop groove to be connected.

6. The bidirectional internal gear pump with clearance compensation function according to claim 1, characterized in that: The synapse is in an arc shape, and the groove is matched to be in an arc shape.

7. The bidirectional internal gear pump with clearance compensation function according to claim 1, characterized in that: The floating side plate is also provided with a dovetail groove, and the dovetail groove is arranged opposite to the oil guide chamber.

8. The bidirectional internal gear pump with clearance compensation function according to claim 3, characterized in that: It also includes a lubricating sleeve, which is connected at the side plate shaft hole of the upper floating side plate and between the side plate shaft hole of the lower floating side plate and the pump body shaft hole.

9. The bidirectional internal gear pump with clearance compensation function according to claim 1, characterized in that: The arc width of the groove is greater than the arc width of the synapse.

10. The bidirectional internal gear pump with clearance compensation function according to claim 6, characterized in that: It also includes a bushing, which is sleeved on the outer side of the external gear.

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