Gear pump, suspension system and vehicle

Abstract

The invention discloses a gear pump, a suspension system and a vehicle, the gear pump comprises a pump body and a gear set, a first cavity and a second cavity are formed in the pump body, at least one part of the gear set is arranged in the pump body, the gear set comprises a first gear and a second gear, and the first gear is arranged in the first cavity. Teeth of the first gear are meshed and matched with teeth of the second gear, the first cavity and the second cavity are separated through a meshing line of the first gear and the second gear, the number of the teeth of the first gear and the number of the teeth of the second gear are both N, and N is larger than or equal to 13. According to the gear pump, the number of the first gears and the number of the second gears are reasonably set, the undercut probability is reduced, the transmission stability is improved, vibration is reduced, the volume efficiency is improved, and noise is also reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a gear pump, a suspension system and a vehicle. Background Art

[0002] The gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport liquid or increase its pressure. It consists of two closed spaces, two gears, a pump body, and front and rear covers. When the gears rotate, the volume of the space on the side where the gears are disengaged changes from small to large, forming a vacuum to suck in the liquid, and the volume of the space on the side where the gears are meshing changes from large to small, squeezing the liquid into the pipeline.

[0003] In the related art, gears are susceptible to root cutting, which reduces the transmission overlap, resulting in unstable gear transmission and low volumetric efficiency. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a gear pump, in which the number of first gears and second gears is reasonably set, the probability of undercutting is reduced, the transmission stability is improved, the vibration is reduced, the volumetric efficiency is improved, and the noise is reduced.

[0005] Another object of the present invention is to provide a suspension system using the gear pump.

[0006] Another object of the present invention is to provide a vehicle using the above suspension system.

[0007] This application is based on the inventor's discovery and understanding of the following facts and problems: A gear pump according to an embodiment of the first aspect of the present invention comprises: a pump body, a first cavity and a second cavity are formed in the pump body; a gear set, at least a portion of which is disposed in the pump body, the gear set comprising a first gear and a second gear, the teeth of the first gear and the teeth of the second gear being meshed with each other, the first cavity and the second cavity being separated by a meshing line of the first gear and the second gear, the number of teeth of the first gear and the number of teeth of the second gear being both N, wherein N satisfies: N≥13.

[0008] According to the gear pump of the present invention, the number of teeth of the first gear and the number of teeth of the second gear are reasonably set. Compared with the gear tooth number of 12 in the traditional technology, the overlap between the first gear and the second gear is improved, and the probability of root cutting of the gear pump is reduced, thereby improving the smoothness of rotation of the first gear and the second gear, reducing the noise generated by the gear pump, and also reducing the probability of oil leakage, thereby improving the volumetric efficiency, thereby improving the performance of the gear pump.

[0009] According to some embodiments of the present invention, N further satisfies: 13≤N≤17.

[0010] According to some embodiments of the present invention, the pressure angle of the gear set is w, wherein w satisfies: 20°≤w≤28°.

[0011] According to some embodiments of the present invention, w further satisfies: 23°≤w≤26°.

[0012] According to some embodiments of the present invention, the gear set also includes a first gear shaft and a second gear shaft, the first gear and the second gear are respectively located on the outer peripheral sides of the first gear shaft and the second gear shaft, and the gear pump also includes: a sleeve, the sleeve includes a first sleeve part and a second sleeve part, the first sleeve part and the second sleeve part are respectively sleeved on the first gear shaft and the second gear shaft, and the sleeve is an integral structural part.

[0013] According to some embodiments of the present invention, the first sleeve portion and the second sleeve portion are arranged along a first direction, a first unloading groove and a second unloading groove are formed on a surface of the sleeve facing the first gear, the first unloading groove and the second unloading groove are arranged at intervals along the second direction, the first unloading groove and the second unloading groove are asymmetrically arranged with respect to a center line of the sleeve along the first direction, and the first direction is perpendicular to the second direction.

[0014] According to some embodiments of the present invention, the first unloading groove and the second unloading groove extend along the second direction, and the first unloading groove and the second unloading groove have different lengths.

[0015] According to some embodiments of the present invention, the distance between one end of the first unloading groove close to the center line of the sleeve and the center line is L1, wherein L1 satisfies: 1.45mm≤L1≤1.55mm; and / or, the distance between one end of the second unloading groove close to the center line of the sleeve and the center line is L2, wherein L2 satisfies: 0.77mm≤L2≤0.83mm.

[0016] According to some embodiments of the present invention, a distance between one end of the first unloading groove away from the center line of the sleeve and the center line is L3, wherein L3 satisfies: 3.97mm≤L3≤7.10mm; and / or a distance between one end of the second unloading groove away from the center line of the sleeve and the center line is L4, wherein L4 satisfies: 3.97mm≤L4≤7.10mm.

[0017] According to some embodiments of the present invention, the inner wall surface of the first unloading groove close to the center line and the inner walls on both sides of the first unloading groove along the first direction are transitioned by a first rounded corner; and / or, the inner wall surface of the second unloading groove close to the center line and the inner walls on both sides of the second unloading groove along the first direction are transitioned by a second rounded corner.

[0018] According to some embodiments of the present invention, the radius of the first rounded corner is r1, wherein r1 satisfies: 0.45mm≤r1≤1.05mm; and / or the radius of the second rounded corner is r2, wherein r2 satisfies: 0.45mm≤r2≤1.05mm.

[0019] According to some embodiments of the present invention, the pump body includes a first pump body and a second pump body arranged and connected along a third direction, a first mounting groove is formed on the first pump body, a second mounting groove is formed on the second pump body, the second mounting groove and the first mounting groove jointly define an installation space, the gear set is arranged in the installation space, and the third direction is the extension direction of the first gear shaft.

[0020] According to some embodiments of the present invention, the first gear and the second gear are located in the second mounting groove, the sleeve is located on the side of the first gear and the second gear close to the first pump body, and one end of the sleeve away from the second pump body is fitted in the first mounting groove.

[0021] According to some embodiments of the present invention, a first sealing ring is provided between the first mounting groove and the outer peripheral side of the end portion of the sleeve away from the second pump body.

[0022] According to some embodiments of the present invention, a retaining ring is provided on a side of the first sealing ring away from the second pump body.

[0023] According to some embodiments of the present invention, a groove is formed on a surface of the first pump body facing the second pump body, the groove extends along the circumference of the first pump body, a second sealing ring is provided between the first pump body and the second pump body, and at least a portion of the second sealing ring fits in the groove.

[0024] According to some embodiments of the present invention, the gear pump further comprises: at least one positioning column, two ends of which are respectively passed through the first pump body and the second pump body, and the positioning column extends along the third direction.

[0025] According to some embodiments of the present invention, the gear pump further comprises: at least one fastener, wherein the fastener passes through the first pump body from a side of the first pump body away from the second pump body and is connected to the second pump body.

[0026] According to some embodiments of the present invention, a third mounting groove is formed on the second pump body, the third mounting groove is located radially outside the second mounting groove, and the third mounting groove is connected to the second mounting groove, and the gear pump further includes: a filter element, the filter element is arranged in the third mounting groove. The suspension system according to the second embodiment of the present invention includes the gear pump according to the first embodiment of the present invention.

[0027] According to some embodiments of the present invention, the suspension system further comprises a transmission mechanism, and the transmission mechanism is connected to the gear pump.

[0028] According to some embodiments of the present invention, the transmission mechanism comprises a brushless motor.

[0029] A vehicle according to an embodiment of a third aspect of the present invention comprises a suspension system according to an embodiment of the second aspect of the present invention.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is an exploded schematic diagram of a gear pump according to an embodiment of the present invention; Figure 2 is a schematic diagram of a shaft sleeve of a gear pump according to an embodiment of the present invention; Figure 3 is a schematic diagram of a shaft sleeve of a gear pump according to an embodiment of the present invention from another angle; Figure 4 is a bottom view of a shaft sleeve of a gear pump according to an embodiment of the present invention; Figure 5 is a schematic diagram of assembling a second gear and a second gear shaft of a gear pump according to an embodiment of the present invention; Figure 6 is an assembly bottom view of a second gear and a second gear shaft of a gear pump according to an embodiment of the present invention; Figure 6-1 is an assembly bottom view of a first gear and a second gear of a gear pump according to an embodiment of the present invention; Figure 6-2 is an assembly top view of a first gear and a second gear of a gear pump according to an embodiment of the present invention; Figure 7 is an internal schematic diagram of a gear pump according to an embodiment of the present invention; Figure 8is a cross-sectional side view of a gear pump according to an embodiment of the present invention; Fig. 9 is a schematic diagram of assembling a shaft sleeve and a second pump body of a gear pump according to an embodiment of the present invention; Fig.10 4 is a cross-sectional view of a second pump body of a gear pump according to an embodiment of the present invention.

[0032] Reference numerals: 100. Gear pump; 1. pump body; 11. first pump body; 111. first mounting groove; 112. groove; 12; second pump body; 121, second mounting groove; 1211, fifth fillet; 1213, first side wall; 1214, second side wall; 122. third mounting slot; 13. mounting space; 14. First cavity; 15. Second cavity; 2. Gear set; 21. First gear; 22. Second gear; 23. First gear shaft; 24. Second gear shaft; 25, a sleeve; 251, a first sleeve portion; 252, a second sleeve portion; 253, first unloading groove; 2531, first fillet; 254, second unloading groove; 2541, second fillet; 255, third fillet; 256, fourth fillet; 3. retaining ring; 4. first sealing ring; 5. second sealing ring; 6. Filter element; 7. Positioning column; 8. Fastener. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 10 A gear pump 100 according to an embodiment of a first aspect of the present invention will be described.

[0034] like Figure 1 As shown, the gear pump 100 according to the first embodiment of the present invention includes a pump body 1 and a gear set 2.

[0035] Specifically, a first cavity 14 and a second cavity 15 are formed in the pump body 1, at least a portion of the gear set 2 is disposed in the pump body 1, the gear set 2 includes a first gear 21 and a second gear 22, the teeth of the first gear 21 and the teeth of the second gear 22 are meshed, the first cavity 14 and the second cavity 15 are separated by the meshing line of the first gear 21 and the second gear 22, the number of teeth of the first gear 21 and the number of teeth of the second gear 22 are both N, wherein N satisfies: N≥13.

[0036] For example, in Figure 1 , Figure 7 and Figure 8 In the example, the upper and middle parts of the gear set 2 (ie, at least a part of the gear set 2) are located in the pump body 1. The first cavity 14 is located on the front side of the meshing line of the first gear 21 and the second gear 22 (ie, Figure 8 The second cavity 15 is located on the right side of the first gear 21 in the middle), and the second cavity 15 is located on the rear side of the meshing line between the first gear 21 and the second gear 22 (i.e. Figure 8 The first chamber 14 is the low pressure area (also called the oil suction area) of the gear pump 100, and the second chamber 15 is the high pressure area (also called the oil discharge area) of the gear pump 100. During the use of the gear pump 100, the first gear 21 and the second gear 22 rotate in coordination in the pump body 1, the front sides of the first gear 21 and the second gear 22 are disengaged, the space volume of the first chamber 14 changes from small to large, the pressure is reduced to form a vacuum, and the liquid (such as oil) is sucked in, the back sides of the first gear 21 and the second gear 22 are meshed, and the space volume of the second chamber 15 changes from large to small, squeezing the liquid out. The flow path of the liquid is as follows: Figure 8 The direction indicated by arrow A.

[0037] When the number of teeth of the first gear 21 and the number of teeth of the second gear 22 are both less than 13, the number of teeth of the first gear 21 and the number of teeth of the second gear 22 are relatively small, and root cutting is prone to occur during the use of the gear pump 100 (that is, during the meshing of the first gear 21 and the second gear 22, when the intersection of the tooth top of the first gear 21 and the meshing line exceeds the limit meshing point of the second gear 22, a part of the involute tooth profile of the tooth root of the second gear 22 is cut off), which reduces the overlap of the gear set 2, reduces the stability of the transmission process of the first gear 21 and the second gear 22, and causes the gear pump 100 to vibrate during use, thereby causing the gear pump 100 to generate greater noise, and also reduces the volumetric efficiency of the gear pump 100, thereby reducing the performance of the gear pump 100.

[0038] When the number of teeth of the first gear 21 and the number of teeth of the second gear 22 are respectively greater than or equal to 13, for example, in combination with Table 1, after experimental verification, when the number of teeth of the first gear 21 and the second gear 22 are respectively 13, the overlap of the first gear 21 and the second gear 22 can reach 1.683, which is significantly higher than the overlap (1.306) when the number of teeth is 12 in the conventional technology, effectively reducing the probability of root cutting of the gear pump 100, thereby improving the stability of the rotation of the first gear 21 and the second gear 22, thereby reducing the probability of oil leakage, improving the volumetric efficiency, and also extending the service life of the gear pump 100. Moreover, while improving the stability of the rotation of the first gear 21 and the second gear 22, the vibration of the first gear 21 and the second gear 22 during the rotation process is reduced, thereby reducing the noise of the gear pump 100.

[0039] Therefore, by setting the number of teeth of the first gear 21 and the number of teeth of the second gear 22 to satisfy: when N≥13, the number of teeth of the first gear 21 and the number of teeth of the second gear 22 are reasonably set, and the overlap degree of the first gear 21 and the second gear 22 during the use of the first gear 21 and the second gear 22 is improved, thereby effectively reducing the probability of root cutting of the first gear 21 and the second gear 22, improving the stability of the rotation of the first gear 21 and the second gear 22, avoiding vibration, and thus reducing the noise of the gear pump 100, and also reducing the probability of oil leakage, improving the volumetric efficiency, and extending the service life of the gear pump 100. For example, in the conventional technology, the noise generated by the gear pump 100 is mostly above 75DB, while the noise of the gear pump 100 in the present application is below 68DB, and the gear pump 100 is more than 10% ahead of the industry level in terms of noise.

[0040] According to the gear pump 100 of the present invention, the number of teeth of the first gear 21 and the number of teeth of the second gear 22 are reasonably set. Compared with the gear number of 12 in the conventional technology, the overlap between the first gear 21 and the second gear 22 is improved, and the probability of root cutting of the gear pump 100 is reduced, thereby improving the smoothness of rotation of the first gear 21 and the second gear 22, reducing the noise generated by the gear pump 100, reducing the probability of oil leakage, and improving the volumetric efficiency, thereby improving the performance of the gear pump 100.

[0041] According to some embodiments of the present invention, N further satisfies: 13≤N≤17. For example, when the number of teeth of the first gear 21 and the number of teeth N of the second gear 22 are both greater than 17, and the sizes of the first gear 21 and the second gear 22 remain unchanged, the teeth of the first gear 21 and the second gear 22 are thinner, which reduces the structural strength of the first gear 21 and the second gear 22. After long-term use, the teeth on the first gear 21 and the second gear 22 are easy to break, thereby shortening the service life of the gear pump 100. In addition, the number of teeth of the first gear 21 and the number of teeth of the second gear 22 are large, which increases the difficulty of processing the first gear 21 and the second gear 22, and is not easy to produce.

[0042] Therefore, by setting N to further satisfy: when 13≤N≤17, the number of teeth of the first gear 21 and the number of teeth of the second gear 22 are reasonably set, and the thickness of the teeth on the first gear 21 and the second gear 22 is increased while ensuring that the probability of root cutting of the first gear 21 and the second gear 22 can be reduced, the structural strength of the first gear 21 and the second gear 22 is improved, and the probability of the teeth of the first gear 21 and the second gear 22 being broken is reduced, thereby extending the service life of the first gear 21 and the second gear 22, so that the gear pump 100 can be used normally for a long time. In addition, the number of teeth of the first gear 21 and the number of teeth of the second gear 22 are also reduced, the processing difficulty of the first gear 21 and the second gear 22 is reduced, and the production efficiency of the gear pump 100 is improved.

[0043] According to some embodiments of the present invention, N satisfies: 13≤N≤15. Thus, the structural strength of the first gear 21 and the second gear 22 is further improved, thereby further extending the service life of the gear pump 100, so as to further meet the requirements of production and use of the gear pump 100 in practice. Moreover, the processing difficulty of the first gear 21 and the second gear 22 is further reduced.

[0044] According to some embodiments of the present invention, the pressure angle of the gear set 2 is w, wherein w satisfies: 20°≤w≤28°. For example, when the pressure angle of the gear set 2 is less than 20°, the pressure angle of the gear set 2 is small, which reduces the overlap of the gear pump 100, reduces the transmission efficiency of the gear set 2, and improves the noise of the gear pump 100. When the pressure angle of the gear set 2 is greater than 28°, the pressure angle of the gear set 2 is large, which increases the torque of the gear pump 100, thereby reducing the volumetric efficiency.

[0045] Therefore, by setting the pressure angle w of the gear set 2 to satisfy: 20°≤w≤28°, the pressure angle of the gear set 2 is set reasonably, further increasing the overlap of the gear pump 100, improving the transmission efficiency of the gear set 2, and further reducing the noise of the gear pump 100. In addition, the torque of the gear pump 100 is reduced, thereby further improving the volumetric efficiency of the gear pump 100 and further improving the performance of the gear pump 100. For example, the pressure angle can be 24°.

[0046] According to some embodiments of the present invention, w further satisfies: 23°≤w≤26°. For example, when the displacement of the gear pump 100 is 0.3 ml / r, the number of teeth on the shaft of the first gear 21 and the number of teeth on the shaft of the second gear 22 are both 13, the pressure angle is 24°, which has the same performance effect as the pressure angle between 23° and 26°.

[0047] Further, refer to Figure 1 , Figure 5 and Figure 6The gear set 2 further includes a first gear shaft 23 and a second gear shaft 24, and the first gear 21 and the second gear 22 are respectively located on the outer peripheral sides of the first gear shaft 23 and the second gear shaft 24. Figure 1 , Figure 5 and Figure 6 In the example, the first gear 21 is located on the outer circumference of the first gear shaft 23, and the second gear 22 is located on the outer circumference of the second gear shaft 24. The first gear 21 rotates along the central axis of the first gear shaft 23, and the second gear 22 rotates along the central axis of the second gear shaft 24. Thus, the first gear shaft 23 and the second gear shaft 24 drive the first gear 21 and the second gear 22 to rotate respectively, so that the first gear 21 and the second gear 22 are meshed and matched.

[0048] Combination Figure 1 and Figure 2 The gear pump 100 further includes a sleeve 25 , which includes a first sleeve portion 251 and a second sleeve portion 252 . The first sleeve portion 251 and the second sleeve portion 252 are respectively sleeved on the first gear shaft 23 and the second gear shaft 24 . The sleeve 25 is an integral structural component.

[0049] For example, in Figure 1 and Figure 2 In the example, the first sleeve portion 251 is sleeved on the first gear shaft 23, and the lower end face of the first sleeve portion 251 contacts the upper side face of the first gear 21. The second sleeve portion 252 is sleeved on the second gear shaft 24, and the lower end face of the second sleeve portion 252 contacts the upper side face of the second gear 22. In this way, the sleeve 25 is an integral structural member, so that the first sleeve portion 251 and the second sleeve portion 252 are firmly connected, thereby helping to improve the stability of the transmission of the first gear shaft 23 and the second gear shaft 24 and reduce the noise of the gear pump 100. In addition, the production difficulty of the contact surface on the pump body 1 that contacts the outer peripheral side of the sleeve 25 (such as the side wall surface of the second mounting groove 121 on the second pump body 12) is reduced, thereby reducing the production difficulty of the gear pump 100 and improving the production efficiency of the gear pump 100. It should be noted that the sleeve 25 can also be an integrally formed part, so that the first sleeve portion 251 and the second sleeve portion 252 are quickly connected into one, which is more convenient to process and improves the production efficiency of the sleeve 25. For example, the shaft sleeve 25 can be processed into an integrally formed part by a numerically controlled milling machine (CNC), which has high processing efficiency and low cost.

[0050] According to some embodiments of the present invention, referring to Figure 2 and Figure 4 The first sleeve portion 251 and the second sleeve portion 252 are arranged along a first direction (eg Figure 2The first unloading groove 253 and the second unloading groove 254 are formed on the surface of the sleeve 25 facing the first gear 21. The first unloading groove 253 and the second unloading groove 254 are arranged along the second direction (as shown in the left and right direction). Figure 2 The first unloading groove 253 and the second unloading groove 254 are arranged at intervals with respect to the center line of the sleeve 25 along the first direction, and the first direction and the second direction are perpendicular.

[0051] For example, in Figure 2 , Figure 3 and Figure 4 In the example, the first unloading groove 253 and the second unloading groove 254 are formed at the connection between the first sleeve portion 251 and the second sleeve portion 252, and the first unloading groove 253 and the second unloading groove 254 are arranged at intervals. As a result, the first unloading groove 253 and the second unloading groove 254 are arranged asymmetrically, which reduces the difficulty of machining the machining center equipment by the CNC milling machine, improves the production efficiency of the sleeve 25, and also improves the sealing of the gear pump 100, avoiding oil leakage of the gear pump 100, so that the gear pump 100 can be used normally for a long time. In addition, the asymmetrical setting cooperates with the high overlap of the gear set 2, solves the oil trap problem, improves the transmission stability, thereby improving the volumetric efficiency, flow, current, noise and other performance indicators of the gear pump 100, leading the industry level by 10% to 20%.

[0052] According to some embodiments of the present invention, referring to Figure 4 The first unloading groove 253 and the second unloading groove 254 are arranged along the second direction (eg Figure 4 The first unloading groove 253 and the second unloading groove 254 extend in the front-to-rear direction as shown, and the lengths of the first unloading groove 253 and the second unloading groove 254 are different.

[0053] With such arrangement, the lengths of the first unloading groove 253 and the second unloading groove 254 are different, which further effectively ensures that the first unloading groove 253 and the second unloading groove 254 are arranged asymmetrically, thereby effectively reducing the influence of oil entrapment and oil leakage of the gear pump 100 on the performance of the gear pump 100, thereby improving the volumetric efficiency of the gear pump 100, improving the mechanical efficiency of the gear pump 100, and improving the assembly efficiency. It should be noted that the ends of the first unloading groove 253 and the second unloading groove 254 that are away from each other respectively penetrate the side wall surface of the shaft sleeve 25. During the use of the gear pump 100, it is convenient for liquid to enter the first unloading groove 253 and the second unloading groove 254, thereby avoiding oil entrapment in the gear pump 100 and reducing the influence of oil entrapment on the gear pump 100.

[0054] According to some embodiments of the present invention, referring to Figure 4 The distance between one end of the first unloading groove 253 close to the center line of the sleeve 25 and the center line is L1, wherein L1 satisfies: 1.45mm≤L1≤1.55mm.

[0055] For example, when the distance between the end of the first unloading groove 253 close to the center line of the shaft sleeve 25 and the center line is less than 1.45mm, the distance between the front end of the first unloading groove 253 and the center line is small, oil leakage is likely to occur, and the volumetric efficiency of the gear pump 100 is reduced. When the distance between the end of the first unloading groove 253 close to the center line of the shaft sleeve 25 and the center line is greater than 1.55mm, the distance between the front end of the first unloading groove 253 and the center line is large, oil trapping is likely to occur, and the volumetric efficiency of the gear pump 100 is reduced. Thus, by setting the distance L1 between the end of the first unloading groove 253 close to the center line of the shaft sleeve 25 and the center line to meet: 1.45mm≤L1≤1.55mm, the distance between the front end of the first unloading groove 253 and the center line is reasonably set, effectively reducing the impact of oil trapping and oil leakage on the performance of the gear pump 100, thereby improving the volumetric efficiency of the gear pump 100 and also improving the assembly efficiency. For example, L1 can be 1.50mm.

[0056] According to other embodiments of the present invention, Figure 4 , the distance between the end of the second unloading groove 254 close to the center line of the shaft sleeve 25 and the center line is L2, wherein L2 satisfies: 0.77mm≤L2≤0.83mm. For example, when the distance between the end of the second unloading groove 254 close to the center line of the shaft sleeve 25 and the center line is less than 0.77, the distance between the rear end of the second unloading groove 254 and the center line is small, oil leakage is prone to occur, and the volumetric efficiency of the gear pump 100 is reduced. When the distance between the end of the second unloading groove 254 close to the center line of the shaft sleeve 25 and the center line is greater than 0.83mm, the distance between the rear end of the second unloading groove 254 and the center line is large, oil entrapment is prone to occur, and the volumetric efficiency of the gear pump 100 is reduced. Therefore, by setting the distance L2 between the end of the second unloading groove 254 close to the center line of the shaft sleeve 25 and the center line to meet the following conditions: 0.77 mm ≤ L2 ≤ 0.83 mm, the distance between the front end of the second unloading groove 254 and the center line is reasonably set, effectively reducing the impact of oil entrapment and oil leakage on the performance of the gear pump 100, thereby improving the volumetric efficiency of the gear pump 100 and also improving the assembly efficiency. For example, L2 can be 0.80 mm.

[0057] According to some further embodiments of the present invention, Figure 4, the distance between the end of the first unloading groove 253 close to the center line of the shaft sleeve 25 and the center line is L1, and the distance between the end of the second unloading groove 254 close to the center line of the shaft sleeve 25 and the center line is L2, wherein L1 and L2 respectively satisfy: 1.45mm≤L1≤1.55mm, 0.77mm≤L2≤0.83mm. Thus, the distances between the front end of the first unloading groove 253 and the rear end of the second unloading groove 254 and the center line are reasonably set, which effectively reduces the influence of oil entrapment and oil leakage on the performance of the gear pump 100, thereby improving the volumetric efficiency of the gear pump 100 and also improving the assembly efficiency.

[0058] According to some embodiments of the present invention, referring to Figure 4 , the distance between the end of the first unloading groove 253 away from the center line of the shaft sleeve 25 and the center line is L3, where L3 satisfies: 3.97mm≤L3≤7.10mm. For example, when the distance between the end of the first unloading groove 253 away from the center line of the shaft sleeve 25 and the center line is less than 3.97mm, the distance between the rear end of the first unloading groove 253 and the center line is small, which increases the gap between the side wall surface of the shaft sleeve 25 at the first unloading groove 253 and the installation location of the pump body 1 (i.e., the side wall surface of the second installation groove 121 of the second pump body 12), and the gear pump 100 will have oil leakage problems during use, which reduces the performance of the gear pump 100 in the performance test (such as torque, volumetric efficiency, current, flow rate and pressure, etc.). When the distance between one end of the first unloading groove 253 away from the center line of the sleeve 25 and the center line is greater than 7.10 mm, the distance between the rear end of the first unloading groove 253 and the center line is larger, which reduces the gap between the side wall surface of the sleeve 25 at the first unloading groove 253 and the installation point of the pump body 1, and the sleeve 25 cannot be installed in the second pump body 12 of the pump body 1.

[0059] Therefore, by setting the distance L3 between the end of the first unloading groove 253 away from the center line of the sleeve 25 and the center line to meet the following conditions: 3.97mm≤L3≤7.10mm, the distance between the rear end of the first unloading groove 253 and the center line is reasonably set, and the gap between the side wall surface of the sleeve 25 at the first unloading groove 253 and the installation position of the pump body 1 is reasonably set, thereby avoiding the oil leakage problem, improving the performance of the gear pump 100 in the performance test, and improving the performance of the gear pump 100. In addition, the sleeve 25 can be installed in the pump body 1, so that the gear pump 100 can be installed normally. For example, L3 further meets the following conditions: 5.18mm≤L3≤5.20mm, and L3 can be 5.19mm.

[0060] According to some embodiments of the present invention, referring to Figure 4, the distance between the end of the second unloading groove 254 away from the center line of the sleeve 25 and the center line is L4, where L4 satisfies: 3.97mm≤L4≤7.10mm. For example, when the distance between the end of the second unloading groove 254 away from the center line of the sleeve 25 and the center line is less than 3.97mm, the distance between the front end of the second unloading groove 254 and the center line is small, which increases the gap between the side wall surface of the sleeve 25 at the second unloading groove 254 and the side wall of the second mounting groove 121, and the gear pump 100 will have oil leakage problems during use, which reduces the performance of the gear pump 100 in the performance test. When the distance between the end of the second unloading groove 254 away from the center line of the sleeve 25 and the center line is greater than 7.10mm, the distance between the rear end of the second unloading groove 254 and the center line is large, which reduces the gap between the side wall surface of the sleeve 25 at the second unloading groove 254 and the side wall surface of the second mounting groove 121 of the pump body 1, and the sleeve 25 cannot be installed in the pump body 1.

[0061] Thus, by setting the distance L4 between the end of the second unloading groove 254 away from the center line of the sleeve 25 and the center line to meet the following conditions: 3.97mm≤L4≤7.10mm, the distance between the front end of the second unloading groove 254 and the center line is reasonably set, and the gap between the side wall surface of the sleeve 25 at the second unloading groove 254 and the side wall of the second mounting groove 121 is reasonably set, thereby avoiding the problem of oil leakage, improving the performance of the gear pump 100 in the performance test, and improving the performance of the gear pump 100. In addition, the sleeve 25 can be installed in the pump body 1, so that the gear pump 100 can be installed normally. For example, L4 further meets the following conditions: 5.18mm≤L4≤5.20mm, and L4 can be 5.19mm. Among them, the depths of the first unloading groove 253 and the second unloading groove 254 along the up and down directions can be d, and d meets the following conditions: 0.5mm≤d≤1.5mm, thereby eliminating trapped oil and avoiding oil leakage. For example, d can be 1mm.

[0062] According to some embodiments of the present invention, referring to Figure 4, the distance between the end of the first unloading groove 253 away from the center line of the sleeve 25 and the center line is L3, and the distance between the end of the second unloading groove 254 away from the center line of the sleeve 25 and the center line is L4, wherein L3 and L4 respectively satisfy: 3.97mm≤L3≤7.10mm, 3.97mm≤L4≤7.10mm. Thus, the distances between the rear end of the first unloading groove 253 and the front end of the second unloading groove 254 and the center line are reasonably set, and the gap between the side wall surface of the sleeve 25 and the side wall of the second mounting groove 121 is reasonably set, thereby avoiding the problem of oil leakage, improving the performance of the gear pump 100 in the performance test, and improving the performance of the gear pump 100. In addition, the sleeve 25 can be installed in the pump body 1, so that the gear pump 100 can be installed normally. It should be noted that the distance between the end of the first unloading groove 253 away from the center line of the sleeve 25 and the end of the second unloading groove 254 away from the center line of the sleeve 25 is L5, that is, L5 is the sum of L3 and L4, wherein L5 satisfies: 7.94mm≤L5≤14.2mm, and the size of the sleeve 25 is set reasonably, which solves the problem of oil leakage and is also easy to install. Among them, the single-side gap can be set to 0.01mm, and the double-side gap can be set to 0.02mm.

[0063] According to some embodiments of the present invention, referring to Figure 4 The inner wall surface of the first unloading groove 253 close to the center line and the inner walls on both sides of the first unloading groove 253 along the first direction (i.e., the left and right direction) are transitioned by a first rounded corner 2531; and / or, the inner wall surface of the second unloading groove 254 close to the center line and the inner walls on both sides of the second unloading groove 254 along the first direction are transitioned by a second rounded corner 2541.

[0064] For example, the inner wall surface of the first unloading groove 253 close to the center line and the inner wall surface of the second unloading groove 254 close to the center line include the following situations: First, the inner wall surface of the first unloading groove 253 close to the center line and the inner walls of the first unloading groove 253 on both sides along the first direction are transitioned by a first rounded corner 2531. Second, the inner wall surface of the second unloading groove 254 close to the center line and the inner walls of the second unloading groove 254 on both sides along the first direction are transitioned by a second rounded corner 2541. Third, the inner wall surface of the first unloading groove 253 close to the center line and the inner walls of the first unloading groove 253 on both sides along the first direction are transitioned by a first rounded corner 2531. At the same time, the inner wall surface of the second unloading groove 254 close to the center line and the inner walls of the second unloading groove 254 on both sides along the first direction are transitioned by a second rounded corner 2541.

[0065] Thus, the arrangement of the first fillet 2531 and the second fillet 2541 further avoids the problem of oil trapping in the gear pump 100, thereby further improving the performance of the gear pump 100. In addition, the arrangement of the first fillet 2531 and the second fillet 2541 is simple, easy to process, and improves the production efficiency of the sleeve 25.

[0066] According to some embodiments of the present invention, referring to Figure 4 , the radius of the first fillet 2531 is r1, wherein r1 satisfies: 0.45mm≤r1≤1.05mm. For example, the first fillet 2531 is a part of a circle with a radius r1. When the radius of the first fillet 2531 is less than 0.45mm, the radius of the first fillet 2531 is small, the first fillet 2531 is close to a right angle, and enters the oil-trapped area, which is prone to oil leakage. When the radius of the first fillet 2531 is greater than 1.05mm, the radius of the first fillet 2531 is large, away from the oil-trapped area, and the problem of oil trapping is prone to occur. Therefore, by setting the radius r1 of the first fillet 2531 to satisfy: 0.45mm≤r1≤1.05mm, the problems of oil leakage and oil trapping are effectively avoided, thereby effectively improving the efficiency of the gear pump 100 and improving the performance of the gear pump 100. For example, r1 can be 0.75mm.

[0067] According to other embodiments of the present invention, Figure 4 , the radius of the second fillet 2541 is r2, wherein r2 satisfies: 0.45mm≤r2≤1.05mm. For example, the second fillet 2541 is a part of a circle with a radius r2. When the radius of the second fillet 2541 is less than 0.45mm, the radius of the second fillet 2541 is small, the second fillet 2541 is close to a right angle, and enters the oil-trapped area, which is prone to oil leakage. When the radius of the second fillet 2541 is greater than 1.05mm, the radius of the second fillet 2541 is large, away from the oil-trapped area, and the problem of oil trapping is prone to occur. Therefore, by setting the radius r1 of the second fillet 2541 to satisfy: 0.45mm≤r1≤1.05mm, the problems of oil leakage and oil trapping are effectively avoided, thereby effectively improving the efficiency of the gear pump 100 and improving the performance of the gear pump 100. For example, r2 can be 0.75mm.

[0068] According to some further embodiments of the present invention, Figure 4, the radius of the first fillet 2531 is r1, and the radius of the second fillet 2541 is r2, wherein r1 and r2 respectively satisfy: 0.45mm≤r1≤1.05mm, 0.45mm≤r2≤1.05mm. Therefore, the radius of the first fillet 2531 and the radius of the second fillet 2541 are reasonably set, effectively avoiding the problems of oil leakage and oil entrapment, thereby effectively improving the efficiency of the gear pump 100 and improving the performance of the gear pump 100. In addition, the design of the number of teeth of the sleeve 25 and the first gear 21 and the number of teeth of the second gear 22 reduces the difficulty of process processing, improves the sealing performance, improves the transmission stability, and the overlap is increased from 1.3 in the industry to 1.68. Therefore, due to the gear pump 100 factor, the assembly noise is reduced from 75DB in the industry to 68, and the volumetric efficiency of 91%~99% can also be achieved. The extremely high efficiency of the industry.

[0069] Optionally, the inner wall surface close to the center line of the first unloading groove 253 is connected to the inner walls on both sides of the first unloading groove 253 along the first direction through a first curved surface (not shown in the figure), and the first curved surface is a part of a first cylinder with a radius r3, wherein r3 satisfies: 0.45mm≤r3≤1.05mm; and / or, the inner walls on both sides of the second unloading groove 254 along the first direction are connected through a second curved surface (not shown in the figure), and the second curved surface is a part of a second cylinder with a radius r4, wherein r4 satisfies: 0.45mm≤r4≤1.05mm.

[0070] For example, the inner wall surface of the first unloading groove 253 close to the center line and the inner wall surface of the second unloading groove 254 close to the center line are arranged in the following situations: First, the inner wall surface of the first unloading groove 253 close to the center line and the inner walls on both sides of the first unloading groove 253 along the first direction are connected by a first arc surface, and the first arc surface is a part of the first cylindrical surface with a radius of r3, wherein r3 satisfies: 0.45mm≤r3≤1.05mm. Second, the inner walls on both sides of the second unloading groove 254 along the first direction are connected by a second arc surface, and the second arc surface is a part of the second cylindrical surface with a radius of r4, wherein r4 satisfies: 0.45mm≤r4≤1.05mm. Third, the inner wall surface close to the center line of the first unloading groove 253 is connected to the inner walls on both sides of the first unloading groove 253 along the first direction through a first arc surface, and the first arc surface is a part of the first cylinder with a radius of r3. The inner walls on both sides of the second unloading groove 254 along the first direction are connected through a second arc surface, and the second arc surface is a part of the second cylinder with a radius of r4, wherein r3 and r4 respectively satisfy: 0.45mm≤r3≤1.05mm, 0.45mm≤r4≤1.05mm.

[0071] For example, the first cylindrical surface and the second cylindrical surface are respectively the outer peripheral surfaces of the cylinder, and the cross-sectional shapes of the first curved surface and the second curved surface are respectively arc-shaped. In this way, the radius of the first curved surface and the radius of the second curved surface are reasonably set, which effectively avoids the problems of oil leakage and oil trapping, thereby effectively improving the efficiency of the gear pump 100 and improving the performance of the gear pump 100. In addition, the first curved surface and the second curved surface are simple in structure and easy to form, thereby improving the production efficiency of the sleeve 25. For example, r3 and r4 can be 0.75 mm respectively.

[0072] Optionally, refer to Figure 2 and Figure 4 The connection between the side wall of the first unloading groove 253 at the end away from the center line and the side surface of the sleeve 25 is a third rounded corner 255 of an arc surface, and the connection between the side wall of the second unloading groove 254 at the end away from the center line and the side surface of the sleeve 25 is a fourth rounded corner 256 of an arc surface. With such an arrangement, the connection between the first unloading groove 253 and the side wall of the sleeve 25, and the connection between the second unloading groove 254 and the side wall of the sleeve 25, prevent the formation of burrs during the processing process, thereby preventing the burrs from increasing the gap between the sleeve 25 and the second mounting groove 121, and also preventing the burrs from scratching the side wall of the second mounting groove 121, thereby preventing oil leakage. Among them, Figure 4 As shown, the third fillet 255 is a part of a circle with a radius of r5, and r5 satisfies: 0.25mm≤r5≤45mm. When r5 is 0.25mm, the edge of the third fillet 255 is shown as line C. When r5 is 45mm, the edge of the third fillet 255 is shown as line B. R5 further satisfies: 2.8mm≤r5≤2.82mm. The fourth fillet 255 is a part of a circle with a radius of r6, and r6 satisfies: 0.25mm≤r6≤45mm. When r6 is 0.25mm, the edge of the fourth fillet 256 is shown as line E. When r6 is 45mm, the fourth fillet 256 is shown as line D. R6 further satisfies: 2.5mm≤r6≤2.52mm.

[0073] When the displacement of the gear pump 100 is 0.3 ml / r, the number of teeth of the first gear 21 and the number of teeth of the second gear 22 are 13 respectively (e.g. Figure 6-1 and Figure 6-2As shown), the modulus is 1.0, the pressure angle is 24°, the coefficient is 0.03, the helix angle is 0°, the tooth top height coefficient is 1.25, the base circle pitch is 2.84, and the base circle diameter is 11.88mm. The overlap can reach 1.68, thereby improving the transmission stability of the gear pump 100, and achieving the industry's extremely high efficiency of 91%~99% in volumetric efficiency, and reducing the noise from 75DB to 68DB in the industry. Among them, the noise of the gear pump 100 is more than 10% ahead of the industry level, the volumetric efficiency is more than 15% ahead of the industry level, the flow rate is more than 10% ahead of the industry level, the wear of the gear pump 100 is reduced, and the life cycle is extended. As shown in Table 1 below.

[0074] Table 1 Gear pump overlap

[0075] It should be noted that, in order to ensure the smoothness of the transmission of the gear pump 100, the overlap is generally required to be greater than or equal to 1.2, and the larger the value, the better. In Table 1, compared with the number of teeth of the first gear and the number of teeth of the second gear of the gear pump in the prior art being 12 respectively, the overlap of the gear pump 100 of the present application is larger and has better performance.

[0076] Further, refer to Figure 1 and Figure 7 The pump body 1 includes a Figure 1 The first pump body 11 and the second pump body 12 are arranged and connected in the upper and lower directions (as shown in the figure), the first pump body 11 is formed with a first mounting groove 111, the second pump body 12 is formed with a second mounting groove 121, the second mounting groove 121 and the first mounting groove 111 jointly define an installation space 13, the gear set 2 is arranged in the installation space 13, and the third direction is the extension direction of the first gear shaft 23.

[0077] For example, in Figure 1 and Figure 7 In the example, the first pump body 11 is located above the second pump body 12. After the first pump body 11 and the second pump body 12 are assembled, the first mounting groove 111 and the second mounting groove 121 are connected to define the installation space 13. The upper part of the shaft sleeve 25 is fitted in the first mounting groove 111, and the lower part of the shaft sleeve 25 is fitted in the second mounting groove 121. In this way, the pump body 1 wraps the shaft sleeve 25, that is, the pump body 1 protects the shaft sleeve 25, avoids damage to the shaft sleeve 25, and thus extends the service life of the shaft sleeve 25. Moreover, the setting of the shaft sleeve 25 also improves the sealing of the assembly of the gear set 2 and the pump body 1. In addition, the setting of the first pump body 11 and the second pump body 12 facilitates the assembly of the pump body 1 and the shaft sleeve 25, reduces the difficulty of installing the gear pump 100, and thus improves the installation efficiency of the gear pump 100.

[0078] Among them, Figure 1 and Fig. 9As shown, the side wall surface of the second mounting groove 112 fits with the outer circumferential surface of the sleeve 25, that is, the shape of the side wall surface of the second mounting groove 112 is adapted to the shape of the outer circumferential surface of the sleeve 25, and a fifth fillet 1211 and a sixth fillet (not shown) are formed on the side wall surface of the second mounting groove 121. The fifth fillet 1211 is recessed inwardly and transitions to an arc surface, that is, the fifth fillet 1211 is a part of a circle with a radius r7, and r7 satisfies: 0.25mm≤r7≤45mm. The sixth fillet is recessed inwardly and transitions to an arc surface, that is, the sixth fillet is a part of a circle with a radius r8. The sixth fillet is matched with the fourth fillet 256, and r8 satisfies: 0.25mm≤r8≤45mm. The fifth fillet 1211 is opposite to the sixth fillet in the radial direction of the second pump body 12, so that the fifth fillet 1211 is matched with the third fillet 255, and the sixth fillet is matched with the fourth fillet 256, which facilitates the assembly of the sleeve 25 and the second pump body 12 and improves the assembly accuracy.

[0079] Optionally, refer to Fig.10 The side wall of the second mounting groove 121 includes a first side wall 1213 and a second side wall 1214 arranged along the axial direction of the second pump body 12, the upper end of the first side wall 1213 and the lower end of the second side wall 1214 are connected, the first side wall 1213 extends in the up-down direction, and the second side wall 1214 extends obliquely in the direction away from the first side wall 1213 and the direction away from the central axis of the second pump body 12. Therefore, in the process of assembling the shaft sleeve 25 with the second pump body 12, the preliminary assembly of the shaft sleeve 25 with the second pump body 12 is facilitated, the assembly difficulty of the shaft sleeve 25 with the second pump body 12 is reduced, and the assembly efficiency of the gear pump 100 is improved. Among them, the angle between the first side wall 1213 and the second side wall 1214 is α, α satisfies: 3°≤α≤13°, preferably, α is 8°. The height of the second side wall 1214 along the up and down direction is h, and h satisfies: 2.3mm≤h≤2.5mm. Preferably, h is 2.4mm, but not limited thereto. It can be specifically set according to actual use conditions to facilitate the use of the second pump body 12 and meet actual use requirements.

[0080] According to some embodiments of the present invention, referring to Figure 1 and Figure 7 , the first gear 21 and the second gear 22 are located in the second mounting groove 121, the sleeve 25 is located on the side of the first gear 21 and the second gear 22 close to the first pump body 11, and the end of the sleeve 25 away from the second pump body 12 is fitted in the first mounting groove 111. For example, Figure 1 and Figure 7In the example, the lower parts of the first gear 21 and the second gear 22 are directly matched with the second mounting groove 121, and the upper parts of the first gear 21 and the second gear 22 are matched with the shaft sleeve 25, and then one part is installed in the second mounting groove 121 and the other part is installed in the first mounting groove 111. In this way, the outer peripheral surface of the shaft sleeve 25 fits with the side wall of the first mounting groove 111 and the side wall of the second mounting groove 121, which improves the sealing performance of the gear pump 100 and avoids oil leakage, thereby improving the performance of the gear pump 100. In addition, the first mounting groove 111 and the second mounting groove 121 have a simple structure, are easy to install, and improve the installation efficiency.

[0081] According to some embodiments of the present invention, referring to Figure 1 and Figure 7 A first sealing ring 4 is provided between the first mounting groove 111 and the outer peripheral side of the end of the sleeve 25 away from the second pump body 12. Figure 1 and Figure 7 In the example, the lower end of the side wall of the first mounting groove 111 is stepped, and the first sealing ring 4 is located between the lower end of the first mounting groove 111 and the upper end of the shaft sleeve 25. With this arrangement, after the first pump body 11 and the shaft sleeve 25 are assembled, the first pump body 11 and the shaft sleeve 25 cooperate to squeeze the first sealing ring 4, thereby improving the sealing performance of the assembly of the first pump body 11 and the shaft sleeve 25, and effectively avoiding oil leakage during the use of the gear pump 100. Further, referring to Figure 1 and Figure 7 , a retaining ring 3 is provided on the side of the first sealing ring 4 away from the second pump body 12. For example, Figure 1 and Figure 7 In the example of , the retaining ring 3 is located between the lower end of the side wall of the first installation groove 111 and the first sealing ring 4. In this way, the retaining ring 3 blocks the first sealing ring 4, prevents the first sealing ring 4 from slipping out, and improves the use stability of the first sealing ring 4.

[0082] According to some embodiments of the present invention, referring to Figure 1 and Figure 7 A groove 112 is formed on the surface of the first pump body 11 facing the second pump body 12. The groove 112 extends along the circumference of the first pump body 11. A second sealing ring 5 is provided between the first pump body 11 and the second pump body 12. At least a part of the second sealing ring 5 fits in the groove 112. For example, Figure 1 and Figure 7In the example, the groove 112 is formed on the lower side of the first pump body 11, the upper part of the second sealing ring 5 fits in the groove 112, and the lower part of the second sealing ring 5 is interference fit with the upper side of the second pump body 12. In this way, after the first pump body 11 and the second pump body 12 are assembled, the second sealing ring 5 is squeezed and interference fits with the first pump body 11 and the second pump body 12, thereby improving the sealing between the first pump body 11 and the second pump body 12 and improving the sealing of the gear pump 100. In addition, the side wall of the groove 112 limits the second sealing ring 5, avoiding the second sealing ring 5 from sliding during the assembly process of the pump body 1, and reducing the difficulty of installing the pump body 1.

[0083] According to some embodiments of the present invention, referring to Figure 1 and Figure 7 The gear pump 100 further includes at least one positioning column 7, the two ends of which are respectively provided on the first pump body 11 and the second pump body 12, and the positioning column 7 extends along the third direction. Figure 1 and Figure 7 In the example, the upper end of the positioning column 7 is passed through the first pump body 11, and the lower end of the positioning column 7 is passed through the second pump body 12. With such a configuration, when the first pump body 11 and the second pump body 12 are installed, the positioning column 7 is used to position the first pump body 11 and the second pump body 12 so that the first pump body 11 and the second pump body 12 are pre-installed, thereby improving the accuracy of the installation of the first pump body 11 and the second pump body 12, thereby facilitating the normal use of the gear pump 100 for a long time. It should be noted that there can be multiple positioning columns 7, and the multiple positioning columns 7 are arranged at intervals along the circumference of the pump body 1, which further improves the accuracy of positioning, but is not limited to this. The number and arrangement of the positioning columns 7 can be specifically set according to actual use conditions to meet actual needs. In the description of the present invention, the meaning of "multiple" is two or more.

[0084] According to some embodiments of the present invention, referring to Figure 1 and Figure 7 The gear pump 100 further includes at least one fastener 8, which passes through the first pump body 11 from a side of the first pump body 11 away from the second pump body 12 and is connected to the second pump body 12. Figure 1 and Figure 7 In the example, the fastener 8 passes through the first pump body 11 and the second pump body 12 at the same time. In this way, the fastener 8 strengthens the connection strength between the first pump body 11 and the second pump body 12, avoids the first pump body 11 and the second pump body 12 from being separated during the use of the pump body 1, and improves the use stability of the pump body 1. It should be noted that there can be multiple fasteners 8 (such as bolts), and the multiple fasteners 8 are arranged at intervals along the circumference of the pump body 1, which further improves the connection strength, but is not limited to this. The number and arrangement of the fasteners 8 can be specifically set according to actual use conditions to meet actual needs.

[0085] According to some embodiments of the present invention, referring to Figure 1 and Figure 7 The second pump body 12 is formed with a third mounting groove 122, which is located radially outward of the second mounting groove 121 and communicates with the second mounting groove 121. The gear pump 100 further includes a filter element 6, which is disposed in the third mounting groove 122. For example, Figure 1 and Figure 7 In the example, a third mounting groove 122 is formed on the upper side of the second pump body 12, and the third mounting groove 122 on the upper side of the second pump body 12 is connected to the second cavity 15. A third mounting groove 122 is also formed on the lower side of the second pump body 12, and the third mounting groove 122 on the lower side of the second pump body 12 is connected to the first cavity 14. Both third mounting grooves 122 are connected to the second mounting groove 121, that is, the first cavity 14 and the second cavity 15 are connected to the second mounting groove 121. Filters 6 are installed in both third mounting grooves 122. Thus, the filter 6 can filter the oil passing through to prevent the oil from being mixed with other objects to block the second mounting groove 121, so that the gear pump 100 can be used normally for a long time.

[0086] The installation process of the gear pump 100 is as follows: first, the first gear 21, the second gear 22, the lower end of the first gear shaft 23 and the lower end of the first gear shaft 24 are installed in the second installation groove 121 of the second pump body 12, and the lower end surface of the first gear shaft 23 and the lower end surface of the second gear shaft 24 protrude from the lower side of the second pump body 121. Then, the sleeve 25 is respectively mounted on the first gear shaft 23 and the second gear shaft 24 and installed in the second installation groove 121, and the filter element 6 is installed in the second pump body 121. At the same time, the first sealing ring 4, the second sealing ring 5 and a plurality of positioning columns 7 are installed in the first pump body 111, and then the first pump body 111 and the second pump body 121 are assembled in the up and down direction. Finally, the fastener 8 passes through the first pump body 111 and the second pump body 121, and the first pump body 111 and the second pump body 121 are locked. It should be noted that the fastener 8 can be a bolt. With such a configuration, the gear pump 100 has a simple structure and is easy to form. The gear pump 100 has good sealing performance, which improves the mechanical performance of the gear pump 100. The flow path of the liquid entering the gear pump 100 is as follows: Figure 7 As shown by the arrow A in the figure, oil flows from the first cavity 14 into the second cavity 15, the front side of the meshing line between the first gear 21 and the second gear 22 is the oil suction area of ​​the gear pump 100 (i.e., the first cavity 14), and the rear side of the meshing line between the first gear 21 and the second gear 22 is the high-pressure area of ​​the gear pump 100 (i.e., the second cavity 15).

[0087] A suspension system (not shown) according to an embodiment of a second aspect of the present invention comprises a gear pump 100 according to an embodiment of the first aspect of the present invention.

[0088] According to the suspension system of the present invention, by adopting the gear pump 100, the stability of the use of the suspension system is improved and the noise of the use of the suspension system is reduced.

[0089] According to some embodiments of the present invention, the suspension system further includes a transmission mechanism (not shown in the figure), which is connected to the gear pump 100. The output shaft of the transmission mechanism is connected to one end of the first gear shaft 23 or the second gear shaft 24 close to the second pump body 12. When the output shaft of the transmission mechanism is connected to the first gear shaft 23, the transmission mechanism drives the first gear 21 to rotate actively, and the second gear 22 to rotate passively. When the output shaft of the transmission mechanism is connected to the second gear shaft 24, the transmission mechanism drives the second gear 22 to rotate actively, and the first gear 21 to rotate passively. The transmission structure drives the first gear 21 and the second gear 22 to rotate so that the gear pump 100 can be used normally.

[0090] Furthermore, the transmission mechanism includes a brushless motor. Therefore, the brushless motor has the advantages of no brushes, low interference, low noise, smooth operation, long life, and low maintenance cost, thereby improving the performance of the transmission mechanism and facilitating the use of the suspension system.

[0091] Optionally, the suspension system further includes an oil pot and a control component (such as a check valve, a damping valve or a central control cylinder, etc.), the oil pot is connected to the first chamber 14, and the control component is connected to the second chamber 15. Thus, under the action of the gear pump 100, the liquid can enter the first chamber 14 from the oil pot, and then flow from the first chamber 14 into the second chamber 15, the spatial volume of the second chamber 15 changes, and the liquid is squeezed into the control component, so that the control component cooperates with other components on the vehicle to control the movement of the vehicle body (such as lifting), so that the body moves according to actual needs to meet actual use. It should be noted that the gear pump 100 can also be used for the tail wing to rotate or twist the tail wing, but it is not limited to this. The gear pump 100 can also be used in other devices, and is specifically set according to actual use conditions to meet actual needs.

[0092] A vehicle (not shown) according to an embodiment of a third aspect of the present invention comprises a suspension system according to an embodiment of the second aspect of the present invention.

[0093] According to the vehicle of the present invention, by adopting the above suspension system, the noise of the vehicle is reduced and the use performance of the vehicle is improved.

[0094] The gear pump 100 , the suspension system and other components and operations of the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail herein.

[0095] In the description of the present invention, it is to be understood that the terms “center”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0097] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A gear pump, characterized in that: include: A pump body, wherein a first cavity and a second cavity are formed in the pump body; A gear set, at least a portion of which is disposed in the pump body, the gear set comprising a first gear and a second gear, the teeth of the first gear and the teeth of the second gear being meshed with each other, the first cavity and the second cavity being separated by a meshing line of the first gear and the second gear, the number of teeth of the first gear and the number of teeth of the second gear being both N, wherein N satisfies: N≥13.

2. The gear pump according to claim 1, characterized in that: The N further satisfies: 13≤N≤17.

3. The gear pump according to claim 1, characterized in that: The pressure angle of the gear set is w, wherein w satisfies: 20°≤w≤28°.

4. The gear pump according to claim 3, characterized in that: The w further satisfies: 23°≤w≤26°.

5. The gear pump according to claim 1, wherein the gear set further comprises a first gear shaft and a second gear shaft, wherein the first gear and the second gear are located at outer peripheral sides of the first gear shaft and the second gear shaft, respectively. The gear pump also includes: The shaft sleeve comprises a first shaft sleeve portion and a second shaft sleeve portion, the first shaft sleeve portion and the second shaft sleeve portion are respectively sleeved on the first gear shaft and the second gear shaft, and the shaft sleeve is an integral structural component.

6. The gear pump according to claim 5, characterized in that The first sleeve portion and the second sleeve portion are arranged along a first direction, and a first unloading groove and a second unloading groove are formed on a surface of the sleeve facing the first gear. The first unloading groove and the second unloading groove are arranged at intervals along the second direction, and the first unloading groove and the second unloading groove are asymmetrically arranged with respect to a center line of the sleeve along the first direction, and the first direction is perpendicular to the second direction.

7. The gear pump according to claim 6, characterized in that The first unloading groove and the second unloading groove extend along the second direction, and the first unloading groove and the second unloading groove have different lengths.

8. The gear pump according to claim 7, characterized in that: The distance between one end of the first unloading groove close to the center line of the sleeve and the center line is L1, wherein L1 satisfies: 1.45mm≤L1≤1.55mm; and / or A distance between one end of the second unloading groove close to the center line of the sleeve and the center line is L2, wherein L2 satisfies: 0.77 mm ≤ L2 ≤ 0.83 mm.

9. The gear pump according to claim 7, characterized in that: The distance between one end of the first unloading groove away from the center line of the sleeve and the center line is L3, wherein L3 satisfies: 3.97 mm ≤ L3 ≤ 7.10 mm; and / or A distance between one end of the second unloading groove away from the center line of the sleeve and the center line is L4, wherein L4 satisfies: 3.97 mm ≤ L4 ≤ 7.10 mm.

10. The gear pump according to claim 6, characterized in that The inner wall surface of the first unloading groove close to the center line and the inner walls on both sides of the first unloading groove along the first direction are transitioned by a first rounded corner; and / or An inner wall surface of the second unloading groove close to the center line and inner walls on both sides of the second unloading groove along the first direction are transitioned by a second rounded corner.

11. The gear pump according to claim 10, characterized in that The radius of the first fillet is r1, wherein r1 satisfies: 0.45 mm ≤ r1 ≤ 1.05 mm; and / or The radius of the second fillet is r2, wherein r2 satisfies: 0.45 mm ≤ r2 ≤ 1.05 mm.

12. The gear pump according to any one of claims 5 to 11, characterized in that: The pump body includes a first pump body and a second pump body connected along a third direction, a first mounting groove is formed on the first pump body, and a second mounting groove is formed on the second pump body, the second mounting groove and the first mounting groove jointly define an installation space, the gear set is arranged in the installation space, and the third direction is the extension direction of the first gear shaft.

13. The gear pump according to claim 12, characterized in that The first gear and the second gear are located in the second installation groove, the sleeve is located on the side of the first gear and the second gear close to the first pump body, and one end of the sleeve away from the second pump body is fitted in the first installation groove.

14. The gear pump according to claim 13, characterized in that A first sealing ring is provided between the first mounting groove and the outer peripheral side of the one end portion of the sleeve away from the second pump body.

15. The gear pump according to claim 14, characterized in that A retaining ring is provided on a side of the first sealing ring away from the second pump body.

16. The gear pump according to claim 12, characterized in that A groove is formed on a surface of the first pump body on one side facing the second pump body, and the groove extends along the circumference of the first pump body. A second sealing ring is provided between the first pump body and the second pump body, and at least a portion of the second sealing ring is fitted in the groove.

17. The gear pump according to claim 12, characterized in that Also includes: At least one positioning column, two ends of which are respectively passed through the first pump body and the second pump body, and the positioning column extends along the third direction.

18. The gear pump according to claim 12, characterized in that Also includes: At least one fastener, wherein the fastener passes through the first pump body from a side of the first pump body away from the second pump body and is connected to the second pump body.

19. The gear pump according to claim 12, characterized in that A third mounting groove is formed on the second pump body, the third mounting groove is located radially outside the second mounting groove, and the third mounting groove is communicated with the second mounting groove, and the gear pump further includes: A filter element is arranged in the third installation groove.

20. A suspension system, characterized in that: Comprising a gear pump according to any one of claims 1-19.

21. The suspension system according to claim 20, characterized in that Also includes: A transmission mechanism is connected to the gear pump.

22. The suspension system according to claim 21, characterized in that The transmission mechanism includes a brushless motor.

23. A vehicle, characterized in that: Comprising a suspension system according to any one of claims 20-22.

Images