Shaft sleeve, gear pump and vehicle

Abstract

The utility model relates to the technical field of hydraulic elements, and provides a shaft sleeve, a gear pump and a vehicle, the shaft sleeve comprises a shaft sleeve body and an abutting part arranged on the shaft sleeve body, and the abutting part is used for abutting against a top cover so that the surface of the side, opposite to the abutting part, of the shaft sleeve body can make contact with a gear assembly. The abutting piece abuts against the top cover so that the surface of the shaft sleeve body can make contact with the gear assembly, and therefore the problem that due to the fact that a large gap exists between the shaft sleeve and the gear assembly, running-in between the contact faces of the gear assembly and the shaft sleeve is not uniform is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic elements, in particular to a shaft sleeve, a gear pump and a vehicle. BACKGROUND

[0002] In the initial stage of operation of the gear pump, there is often a gap between the shaft sleeve and the gear assembly, and the shaft sleeve is thus prone to tilt to a certain extent, resulting in uneven running of the surfaces of the gear assembly and the shaft sleeve, and causing wear of the contact surface of the gear assembly and the shaft sleeve, which further leads to problems such as reduced mechanical efficiency, reduced volumetric efficiency, increased noise and reduced service life of the gear pump. CONTENT OF THE UTILITY MODEL

[0003] The embodiments of the present application provide a shaft sleeve, a gear pump and a vehicle to at least partially solve the problem of uneven running of the surfaces of the gear assembly and the shaft sleeve.

[0004] To achieve the above-mentioned purpose, according to a first aspect of the present application, a shaft sleeve is provided, comprising: a shaft sleeve body and an abutting member provided on the shaft sleeve body, the abutting member being used for abutting against a top cover to make the surface of the shaft sleeve body on the side relative to the abutting member contact with a gear assembly.

[0005] Optionally, the abutting member comprises an abutting surface for abutting against the top cover, and the width of the abutting surface is greater than or equal to 0.03 mm and less than or equal to 0.15 mm.

[0006] Optionally, the width of the abutting surface is equal to 0.05 mm.

[0007] Optionally, the length of the abutting surface is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

[0008] Optionally, the length of the abutting surface is equal to 1 mm.

[0009] Optionally, a plurality of abutting members are provided on the shaft sleeve body in intervals, and the abutting surfaces of the plurality of abutting members are coplanar.

[0010] Optionally, the plurality of abutting members are arranged along the edges of the shaft sleeve body.

[0011] Optionally, the shaft sleeve body comprises a plurality of edge sections, each of the abutting members is located on one side of one of the edge sections and parallel to the edge section.

[0012] Optionally, a connecting section is further provided between any two adjacent edge sections, and the lengths of any two connecting sections are equal.

[0013] Optionally, the abutting member comprises an abutting portion, and the abutting surface is located on a side of the abutting portion away from the sleeve body; wherein the width of the abutting portion gradually decreases in a direction away from the sleeve body.

[0014] Optionally, a plurality of unloading grooves are arranged on the surface of the sleeve body away from the abutting member.

[0015] Optionally, the sleeve body has a first through hole for the driving gear of the gear assembly to pass through and a second through hole for the driven gear of the gear assembly to pass through, and the two unloading grooves are respectively arranged on two sides of a line connecting the axial center of the first through hole and the axial center of the second through hole.

[0016] Optionally, the first distance between one of the unloading grooves and the line is smaller than the second distance between the other unloading groove and the line.

[0017] According to a second aspect of the present application, a gear pump is provided, which comprises a gear assembly, a top cover and the sleeve according to any one of the preceding claims, the abutting member abuts against the top cover so that the surface of the sleeve body is in contact with the gear assembly.

[0018] Optionally, the gear assembly comprises a driving gear and a driven gear, and the number of teeth of the driving gear and the driven gear is greater than or equal to 13.

[0019] Optionally, the pressure angle of the gear assembly is greater than or equal to 23° and less than or equal to 26°.

[0020] Optionally, the pressure angle of the gear assembly is 24°.

[0021] According to a third aspect of the present application, a vehicle is also provided, which comprises the gear pump as described above.

[0022] In the gear pump of the embodiments of the present application, the abutting member abuts against the top cover, so that the surface of the sleeve body is in contact with the gear assembly, thereby effectively avoiding the problem that a large gap exists between the sleeve and the gear assembly, which causes uneven wear between the contact surfaces of the gear assembly and the sleeve. Therefore, the sleeve provided in the embodiments of the present application can effectively guarantee the mechanical efficiency of the gear pump to which it is applied, improve the volumetric efficiency of the gear pump, reduce the noise of the gear pump during operation, and prolong the service life of the gear pump. In addition, a good fitting state can be formed between the sleeve and the gear assembly during the entire operation of the gear pump, which can guarantee the efficient operation of the gear pump.

[0023] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0025] In order to more completely understand the present application and its beneficial effects, the following will be combined with the drawings to explain the following, wherein the same reference numerals in the following description represent the same parts.

[0026] Figure 1 is a structural schematic diagram of a gear pump provided by some embodiments of the present disclosure;

[0027] Figure 2 is a structural schematic diagram of a shaft sleeve provided by some embodiments of the present disclosure;

[0028] Figure 3 is a top view of a shaft sleeve provided by some embodiments of the present disclosure;

[0029] Figure 4 is a partial structural schematic diagram of a shaft sleeve provided by some embodiments of the present disclosure;

[0030] Figure 5 is a bottom view of a shaft sleeve provided by some embodiments of the present disclosure;

[0031] Figure 6 is a structural schematic diagram of a gear pump provided by some other embodiments of the present disclosure;

[0032] Figure 7 is a top view of a driving gear or a driven gear according to some embodiments of the present disclosure.

[0033] Explanation of reference numerals:

[0034] 10, shaft sleeve; 100, gear pump; 11, shaft sleeve body; 110, unloading groove; 111, edge section; 112, connecting section; 12, abutting member; 120, abutting surface; 121, abutting portion; 122, base portion;

[0035] 20, top cover;

[0036] 30, gear assembly; 31, driving gear; 32, driven gear;

[0037] 40, bottom shell;

[0038] 51, upper sealing member; 52, check ring; 53, lower sealing member; 54, positioning column; 55, filter screen;

[0039] D1, first distance; D2, second distance; K1, first through hole; K2, second through hole; L, connecting line. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative effort fall within the protection scope of the present application.

[0041] Some embodiments of the present application provide a shaft sleeve, such as Figures 1 to 3 As shown, the shaft sleeve 10 comprises a shaft sleeve body 11 and an abutting piece 12 arranged on the shaft sleeve body 11, the abutting piece 12 is used to abut against the top cover 20, so that the surface of the shaft sleeve body 11 on the side opposite to the abutting piece 12 is in contact with the gear assembly 30.

[0042] In this way, by abutting the abutting piece 12 against the top cover 20, the surface of the shaft sleeve body 11 is in contact with the gear assembly 30, thereby effectively avoiding the problem that there is a large gap between the shaft sleeve 10 and the gear assembly 30, and thus the contact surfaces of the gear assembly 30 and the shaft sleeve 10 are unevenly worn. Therefore, the shaft sleeve provided in the embodiments of the present application can effectively guarantee the mechanical efficiency of the gear pump to which it is applied, improve the volumetric efficiency of the gear pump, reduce the noise of the gear pump during operation, and prolong the service life of the gear pump. The volumetric efficiency refers to the ratio of the actual flow rate to the theoretical flow rate of the gear pump, and the higher the volumetric efficiency, the higher the operating efficiency of the gear pump.

[0043] It is worth noting that by abutting the abutting piece 12 against the top cover 20, the shaft sleeve body 11 can be in good contact with the gear assembly 30 at the initial stage of operation of the gear pump, thereby relieving the problem that the shaft sleeve body 11 is inclined and the contact surfaces of the shaft sleeve body 11 and the gear assembly 30 are unevenly worn. In the later stage of operation of the gear pump, the side of the shaft sleeve body 11 away from the gear assembly 30 is subjected to a high pressure (for example, reaching 20 MPa), so that the shaft sleeve body 11 is in close contact with the gear assembly 30. Therefore, the shaft sleeve 10 provided in the embodiments of the present application can form a good close contact state between the shaft sleeve 10 and the gear assembly 30 throughout the operation of the gear pump, thereby guaranteeing the efficient operation of the gear pump.

[0044] In some examples, the gear assembly 30 comprises a driving gear and a driven gear, and in the case that the abutting piece 12 abuts against the top cover 20, the shaft sleeve body 11 can be in contact with the side surface of the driving gear and the driven gear.

[0045] In some embodiments, as shown in Figure 4As shown, the abutting member 12 includes an abutting surface 120 for abutting against the top cover 20, and the width of the abutting surface 120 is greater than or equal to 0.03 mm and less than or equal to 0.15 mm. In this way, it can be avoided that the width of the abutting surface 120 is too small, so that the contact area between the abutting member 12 and the top cover 20 is too small, and then the pressure between the abutting member 12 and the top cover 20 is too large and causes damage to the top cover 20. Also, it can be avoided that the width of the abutting surface 120 is too large, so that the force of the top cover 20 on the shaft sleeve 10 is too large, which causes the surface of the shaft sleeve body 11 to be tightly attached to the gear assembly 30, and then affects the rotation of the gears in the gear assembly 30. Therefore, by setting the width of the abutting surface 120 in the range of 0.03 mm to 0.15 mm, the surface of the shaft sleeve body 11 is slightly attached to the gear assembly 30, so as to ensure that the shaft sleeve 10 is in a good posture, so as to improve the uniformity of the running-in of the gear assembly 30 and the surface of the shaft sleeve body 11, and then improve the volumetric efficiency of the gear pump and reduce the noise of the gear pump during operation.

[0046] It should be noted that the difference between the tight attachment and the slight attachment is the difference in the contact area between the abutting member 12 and the top cover 20. In the case of slight attachment, the contact area between the abutting member 12 and the top cover 20 is small; in the case of tight attachment, the contact area between the abutting member 12 and the top cover 20 is large.

[0047] In some examples, the width of the abutting surface 120 can be 0.03 mm, 0.05 mm, 0.07 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.14 mm or 0.15 mm, etc. The present application does not limit the specific value thereof, as long as it is in the range of 0.03 mm to 0.15 mm.

[0048] In some embodiments, the width of the abutting surface 120 is equal to 0.05 mm. In this case, the abutting member 12 and the top cover 20 can have a certain abutting area, so as to ensure that the surface of the shaft sleeve body 11 is slightly attached to the gear assembly 30. In addition, by setting the width of the abutting surface 120 to 0.05 mm, it is also convenient for the manufacture of the abutting member 12.

[0049] In some embodiments, the length of the abutting surface 120 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

[0050] In this way, the abutting surface 120 can have a certain area to form a good abutment with the top cover 20, so as to ensure that the surface of the shaft sleeve body 11 is in contact with the gear assembly 30, and then avoid the posture of the gear assembly 30 from being tilted.

[0051] As an example, the length of the abutting surface 120 can be 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, or other values between 0.5 mm and 1.5 mm.

[0052] In some examples, the length of the abutting surface 120 can be 1 mm, so that the abutting surface 120 has a certain area to form a good abutment with the top cover 20, thereby ensuring a certain contact area between the surface of the shaft sleeve body 11 and the gear assembly 30.

[0053] It is worth noting that in the case of abutment between the abutting surface 120 and the top cover 20, the surface of the shaft sleeve body 11 near the gear assembly 30 side forms a contact with the gear assembly 30 in the thickness direction of the shaft sleeve body 11 corresponding to the area of the abutting surface 120, thereby making the gear assembly 30 have good attitude stability.

[0054] In some examples, the height of the abutting member 12 can be greater than or equal to 0.13 mm and less than or equal to 0.15 mm, so that the abutting member 12 can form an effective abutment with the top cover 20, thereby ensuring the contact between the shaft sleeve body 11 and the gear assembly 30. Of course, the height of the abutting member 12 can also be adaptively adjusted according to the thickness of the shaft sleeve body 11 and the thickness of the gear assembly 30 and other parameters, as long as the abutting member 12 can abut with the top cover 20 and ensure the contact between the surface of the shaft sleeve body 11 and the gear assembly 30.

[0055] In some embodiments, as shown in Figure 2 and Figure 3 The shaft sleeve body 11 is provided with a plurality of abutting members 12, and the abutting surfaces 120 of the plurality of abutting members 12 are coplanar.

[0056] Since the abutting surfaces 120 of the plurality of abutting members 12 are located in the same plane, all the abutting members 12 can abut with the top cover 20 to ensure the attitude stability of the shaft sleeve 10. In addition, by arranging the plurality of abutting members 12 to abut with the top cover 20 at different positions, it is also beneficial to correct different positions of the shaft sleeve 10 to improve the attitude stability of the shaft sleeve 10, thereby effectively avoiding the problem of uneven wear between the shaft sleeve 10 and the gear assembly 30 caused by the inclination of the shaft sleeve 10.

[0057] In some embodiments, as shown in Figure 3 The plurality of abutting members 12 are arranged along the edge of the shaft sleeve body 11.

[0058] The inclined position of the shaft sleeve 10 is usually located at the edge position in the initial operation of the gear pump, and the plurality of abutting pieces 12 are arranged along the edge of the shaft sleeve body 11 in the embodiment, so that the edge position of the shaft sleeve body 11 is supported by the top cover 20, the posture stability of the shaft sleeve 10 as a whole is better, and the problem of uneven wear between the shaft sleeve 10 and the gear assembly 30 caused by the inclination of the shaft sleeve 10 is effectively avoided.

[0059] In some examples, the plurality of abutting pieces 12 are uniformly arranged. In this way, the stability of mutual support between the shaft sleeve 10 and the top cover 20 is enhanced, so as to improve the posture stability of the shaft sleeve 10.

[0060] In some examples, the edge of the shaft sleeve body 11 can include an arc shape.

[0061] In some embodiments, please continue to refer to Figure 3 The shaft sleeve body 11 includes a plurality of edge sections 111, and each abutting piece 12 is located at one side of one edge section 111 and parallel to the edge section 111. The number of edge sections 111 can be the same as the number of abutting pieces 12.

[0062] For example, the number of abutting pieces 12 can be 8. In this way, the shaft sleeve body 11 and the gear assembly 30 have a certain contact area, so as to ensure that the shaft sleeve body 11 and the gear assembly 30 are slightly attached, thereby improving the posture stability of the shaft sleeve 10.

[0063] It is worth noting that each abutting piece 12 is parallel to an edge section 111 means that each abutting piece 12 has an equal spacing distance at different positions of the edge section 111.

[0064] By arranging each abutting piece 12 parallel to the edge section 111 corresponding to the abutting piece 12, the uniformity of the arrangement of the abutting piece 12 is improved, thereby improving the posture stability of the shaft sleeve 10.

[0065] In some examples, the edge section 111 is linear, the plurality of sides of the abutting piece 12 close to and away from the edge section 111 are also linear, and the edge section 111 and the sides of the abutting piece 12 are parallel.

[0066] In other examples, the edge section 111 is arc-shaped, the plurality of sides of the abutting piece 12 close to and away from the edge section 111 are also arc-shaped, and the curvature of the sides of the abutting piece 12 is the same as or substantially the same as the curvature of the edge section 111.

[0067] In some examples, the edge segment 111 comprises a plurality of sub-edge segments connected in sequence, the plurality of sides of the edge segment 111 close to and away from the abutting member 12 also comprises a plurality of sub-sides connected in sequence, the plurality of sub-edge segments and the plurality of sub-sides are in one-to-one correspondence, and each sub-edge segment is parallel to and has an equal spacing with a corresponding sub-side.

[0068] In some embodiments, please refer to Figure 3 , the two adjacent edge segments 111 are further provided with a connecting segment 112, and the length of any two connecting segments 112 is equal.

[0069] In some examples, the connecting segment 112 can be arc-shaped, and the radii of the connecting segments 112 at different positions can be equal or unequal, which is not limited in the embodiments of the present application.

[0070] In some embodiments, please refer to Figure 3 , the shaft sleeve body 11 can comprise eight edge segments 111 and eight connecting segments 112. The three edge segments 111 located on one side of the shaft sleeve body 11 have the same radius, and the central angles corresponding to the three edge segments 111 coincide. The three edge segments 111 located on the other side of the shaft sleeve body 11 have the same radius, and the central angles corresponding to the three edge segments 111 coincide. The two edge segments 111 located at the middle position of the shaft sleeve body 11 have opposite bending directions.

[0071] In some embodiments, as shown in Figure 4 , the abutting member 12 comprises an abutting portion 121, and the abutting surface 120 is located on the side of the abutting portion 121 away from the shaft sleeve body 11. In the direction away from the shaft sleeve body 11, the width of the abutting portion 121 gradually decreases. That is, the abutting portion 121 has a structure with a large area at one end and a small area at the other end, and the cross-sectional area of the abutting portion 121 gradually decreases in the direction away from the shaft sleeve body 11.

[0072] In this way, the abutting member 12 has a large supporting strength, which can ensure that the abutting portion 121 has a good abutting effect with the top cover 20, so that the shaft sleeve body 11 has a good contact with the gear assembly 30.

[0073] In some examples, the width of the cross section of the abutting portion 121 away from the abutting surface 120 can be 0.25 mm, which can effectively ensure the structural stability of the abutting portion 121.

[0074] In some examples, the abutting member 12 further comprises a base portion 122 located between the abutting portion 121 and the shaft sleeve body 11, and the base portion 122 is fixed on the shaft sleeve body 11. The width of any cross section of the base portion 122 (in the height direction thereof) can be 0.25 mm.

[0075] In some embodiments, as shown in Figure 5 The surface of the shaft sleeve body 11 on the side away from the abutting member 12 is provided with a plurality of unloading grooves 110.

[0076] In the working process of the gear pump, the meshing of the gears will cause the oil trapping phenomenon (i.e. a closed volume space is formed in the area where the gears mesh), which affects the operation of the gear pump. By providing a plurality of unloading grooves 110 on the surface of the shaft sleeve body 11 on the side close to the gear assembly 30, the closed volume space is thus communicated with the oil suction chamber or the oil pressure chamber of the gear pump, so as to eliminate the oil trapping phenomenon and thus ensure the stable operation of the gear pump.

[0077] In some embodiments, please continue to refer to Figure 5 The shaft sleeve body 11 has a first through hole K1 for the driving gear assembly of the gear assembly 30 to pass through and a second through hole K2 for the driven gear assembly of the gear assembly 30 to pass through, and the two unloading grooves 110 are respectively located on both sides of a connecting line L of the axis of the first through hole K1 and the axis of the second through hole K2. Among them, the axis of the first through hole K1 is the geometric center of the first through hole K1 in the plan view of the shaft sleeve body 11, and the axis of the second through hole K2 is the geometric center of the second through hole K2 in the plan view of the shaft sleeve body 11.

[0078] In the two unloading grooves 110, one unloading groove 110 can be communicated with the oil suction chamber of the gear pump, and the other unloading groove 110 can be communicated with the oil pressure chamber of the gear pump, so as to eliminate the oil trapping phenomenon.

[0079] In some examples, in the two unloading grooves 110, one unloading groove 110 has a first distance D1 from the connecting line L, and the other unloading groove 110 has a second distance D2 from the connecting line L, and the first distance D1 is less than the second distance D2. In this way, the two unloading grooves 110 are asymmetric, which is beneficial to alleviate the influence of vibration and noise, and is also beneficial to reduce the manufacturing difficulty of the shaft sleeve 10.

[0080] Some embodiments of the present application provide a gear pump, as shown in Figure 1 and Figure 6 The gear pump 100 includes a gear assembly 30, a top cover 20, and a shaft sleeve 10 located between the gear assembly 30 and the top cover 20, and the abutting member 12 abuts against the top cover 20, so that one side surface of the shaft sleeve body 11 is in contact with the gear assembly 30.

[0081] In this way, the surface of the shaft sleeve body 11 is in contact with the gear assembly 30 by abutting the top cover 20 with the abutting member 12, thereby effectively avoiding the problem of uneven wear between the contact surface of the gear assembly 30 and the shaft sleeve 10 due to the large gap between the shaft sleeve 10 and the gear assembly 30. Therefore, the gear pump 100 provided by the embodiment has good mechanical efficiency and volumetric efficiency, low working noise, and a long service life. In addition, the shaft sleeve 10 and the gear assembly 30 can form a good fit throughout the operation of the gear pump, thereby ensuring efficient operation of the gear pump 100.

[0082] In some embodiments, as shown in Figure 6 The gear pump 100 further includes a bottom shell 40, and the gear assembly 30 can be installed in the accommodating cavity of the bottom shell 40. For example, the gear assembly 30 includes a rotating shaft, and the rotating shaft can be inserted into the opening of the bottom shell 40, so that the driving gear and the driven gear in the gear assembly 30 are positioned on a horizontal plane and the meshing between the driving gear and the driven gear is maintained.

[0083] In some examples, the gear pump 100 further includes a filter screen 55, which can filter the liquid entering the oil suction cavity and the liquid from the oil pressure cavity to avoid damage to the operation of the gear assembly 30 due to the presence of solids in the liquid.

[0084] The gear pump 100 further includes a lower sealing member 53, which can seal between the gear assembly 30 and the bottom shell 40, thereby improving the volumetric efficiency of the gear pump 100.

[0085] The gear pump 100 can further include an upper sealing member 51 and a retainer ring 52 arranged in sequence on the shaft sleeve 10, and the upper sealing member 51 and the retainer ring 52 are located between the top cover 20 and the shaft sleeve 10. The upper sealing member 51 can seal the gap between the shaft sleeve 10 and the top cover 20, thereby improving the volumetric efficiency of the gear pump 100. The retainer ring 52 can fix the upper sealing member 51 to ensure the stability of the upper sealing member 51.

[0086] As an example, the gear pump 100 can further include a positioning column 54, which can cooperate with the openings in the top cover 20 and the bottom shell 40 to achieve positioning of the top cover 20 and the bottom shell 40, so that the top cover 20 and the bottom shell 40 have a good alignment relationship. The top cover 20 and the bottom shell 40 can be connected by a fixing member to achieve the fixation of the top cover 20 and the bottom shell 40, thereby completing the assembly of the gear pump 100.

[0087] In some embodiments, as shown in Figure 6 and Figure 7 The gear assembly 30 includes a driving gear and a driven gear, and the number of teeth of the driving gear and the driven gear is greater than or equal to 13.

[0088] In the related art, for a gear pump with a flow rate of 0.3 ml / r, the number of teeth of the driving gear and the driven gear is usually less than 12, and the gear pump is affected by undercutting, the transmission is unstable, and the noise is large. By setting the number of teeth of the driving gear and the driven gear to be more than 13, the flow rate pulsation can be reduced, the transmission between the gears is more stable, and the flow rate is more stable. In addition, the increase in the number of teeth can also uniformly distribute the load, reduce leakage, and improve the sealing performance of the gear pump 100.

[0089] In some embodiments, the pressure angle of the gear assembly 30 is greater than or equal to 23° and less than or equal to 26°.

[0090] In the related art, for a gear pump with 12 teeth of the driving gear and the driven gear, the gear overlap can only reach 1.3, and the operating noise can reach 75 decibels. However, when the number of teeth of the driving gear and the driven gear is set to 13 and the pressure angle is set to be within the range of 23° to 26°, the gear overlap can reach 1.68, thereby improving the volumetric efficiency of the gear pump 100 to 91% to 99%. In addition, due to the improvement of the gear overlap, the operating noise of the gear pump 100 can be reduced to less than 68 decibels. Therefore, compared with the gear pump in the related art, the gear pump 100 provided by the present application can improve the volumetric efficiency by more than 15%, increase the flow rate by more than 10%, and reduce the noise by at least 10%.

[0091] In some examples, the pressure angle of the gear assembly 30 is equal to 24°.

[0092] For the gear assembly 30, when the number of teeth of the gear is 13, the modulus is 1.0, the pressure angle is 24°, the base circle diameter is 11.88 mm, the base circle pitch is 2.84 mm, the addendum coefficient is 1.25, and the modification coefficient is 0.03, the gear overlap of the gear assembly 30 can be 1.68. Therefore, the gear pump 100 provided by the present application has different degrees of improvement in volumetric efficiency, flow rate, noise, and the like.

[0093] For example, the gear overlap can be calculated according to the following formula:

[0094]

[0095] wherein ε represents the gear overlap, B1B2 represents the length of the actual meshing line, P a represents the normal pitch of the gear. b

[0096] ​In some examples, the pressure angle of the gear assembly 30 can also be 23°, 25°, or 26°, etc., which are not limited in the embodiments of the present application.

[0097] Some embodiments of the present application provide a vehicle, which comprises the gear pump 100 according to any one of the above embodiments.

[0098] Due to the gear pump 100, the vehicle has the technical effects of the gear pump 100, which are not repeated here.

[0099] In the description of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0100] In the above embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0101] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0102] The above are only the preferred embodiments of the present application, and do not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution content of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A bushing, characterized in that, include: The bushing body (11); and An abutment (12) is provided on the bushing body (11) to abut against the top cover (20) so that the surface of the bushing body (11) opposite to the abutment (12) contacts the gear assembly (30).

2. The bushing according to claim 1, characterized in that, The abutment (12) includes an abutment surface (120) for abutting the top cover (20), the width of the abutment surface (120) being greater than or equal to 0.03 mm and less than or equal to 0.15 mm.

3. The bushing according to claim 2, characterized in that, The width of the contact surface (120) is equal to 0.05 mm.

4. The bushing according to claim 2, characterized in that, The length of the contact surface (120) is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

5. The bushing according to claim 4, characterized in that, The length of the contact surface (120) is 1 mm.

6. The bushing according to any one of claims 1-5, characterized in that, The bushing body (11) is provided with a plurality of abutting members (12) spaced apart, and the abutting surfaces (120) of the plurality of abutting members (12) are coplanar.

7. The bushing according to claim 6, characterized in that, Multiple abutments (12) are disposed along the edge of the bushing body (11).

8. The bushing according to claim 6, characterized in that, The bushing body (11) includes a plurality of edge segments (111), each of the abutments (12) being located on one side of an edge segment (111) and parallel to the edge segment (111).

9. The bushing according to claim 8, characterized in that, A connecting segment (112) is provided between two adjacent edge segments (111), and any two connecting segments (112) have the same length.

10. The bushing according to any one of claims 2-5, characterized in that, The abutting member (12) includes an abutting portion (121), and the abutting surface (120) is located on the side of the abutting portion (121) away from the bushing body (11); wherein, along the direction of the abutting portion (121) away from the bushing body (11), the width of the abutting portion (121) gradually decreases.

11. The bushing according to any one of claims 1-5, characterized in that, The bushing body (11) has a plurality of unloading grooves (110) on the side away from the abutment (12).

12. The bushing according to claim 11, characterized in that, The bushing body (11) has a first through hole (K1) through which the driving gear of the gear assembly (30) passes and a second through hole (K2) through which the driven gear of the gear assembly (30) passes. The two unloading grooves (110) are located on both sides of the line (L) connecting the axis of the first through hole (K1) and the axis of the second through hole (K2).

13. The bushing according to claim 12, characterized in that, One of the unloading grooves (110) has a first gap (D1) between it and the connecting line (L), and the other unloading groove (110) has a second gap (D2) between it and the connecting line (L), wherein the first gap (D1) is smaller than the second gap (D2).

14. A gear pump, characterized in that, include: The gear assembly (30), the top cover (20), and the bushing (10) according to any one of claims 1-13, wherein the abutment (12) abuts against the top cover (20) such that one side surface of the bushing body (11) contacts the gear assembly (30).

15. The gear pump according to claim 14, characterized in that, The gear assembly (30) includes a driving gear and a driven gear, wherein the number of teeth of the driving gear and the driven gear is greater than or equal to 13.

16. The gear pump according to claim 15, characterized in that, The pressure angle of the gear assembly (30) is greater than or equal to 23° and less than or equal to 26°.

17. The gear pump according to claim 16, characterized in that, The pressure angle of the gear assembly (30) is 24°.

18. A vehicle, characterized in that, Includes the gear pump (100) according to any one of claims 14-17.

Images