Gear pump structure and electro-hydraulic power steering system

Abstract

Provided are a gear pump structure (100) and an electro-hydraulic power steering system (10). A base (110) of the gear pump structure (100) comprises a plurality of grooves (112). An elastic member (120) is arranged in the grooves (112) and protrudes out of the grooves, and comprises a plurality of elastic parts (122, 124, 126). The elastic parts have a plurality of protruding distances relative to the base (110), and the protruding distances are different from each other. One end of a gear assembly (130) is connected to the elastic member (120). The elastic member (120) is squeezed by the gear assembly (130) and the base (110) and is then deformed, so that the elastic parts are tightly engaged between the gear assembly (130) and the base (110). Thus, by means of the elastic member (120) having a height difference, the pressure retention and oil sealing effects are achieved, and leakage can be effectively prevented.

Description

Gear pump structure and electronic hydraulic power steering system Technical Field

[0001] The present invention relates to a gear pump structure and an electronic hydraulic power steering system, and in particular to a gear pump structure and an electronic hydraulic power steering system applied to electric vehicles. Background Art

[0002] Electronic power steering has many advantages such as energy saving, environmental protection and safety, and is currently a hot topic in the research of electrification of power steering. The gear components of the current electronic hydraulic power steering (EHPS) system are connected through gaskets. However, conventional gaskets are often prone to leakage due to loose connections. In addition, the general EHPS system uses an oil pot structure as an oil storage carrier, which is used to replenish or store oil. However, the conventional gear pump structure and oil pot structure allow the oil to flow along an oil return path in the oil pot structure. This oil return path directly leads to the oil surface above, so there is a problem of oil surface disturbance. It can be seen that the market currently lacks a gear pump structure and EHPS system that can effectively prevent leakage, have safe pressure relief and can slow down and prevent oil surface disturbances, so relevant industry players are all looking for solutions.

[0003] Summary of the Invention

[0004] Therefore, the object of the present invention is to provide a gear pump structure and an electronic hydraulic power steering system, which utilizes elastic members with special structures to achieve pressure holding and oil sealing effects, thereby solving the problem of leakage in conventional structures due to loose assembly.

[0005] According to one embodiment of the present invention, a gear pump structure is provided, comprising a base, an elastic member, and a gear assembly. The base includes a plurality of grooves. The elastic member protrudes from these grooves and includes a plurality of elastic portions. These elastic portions protrude from the base at various distances, each of which differs from the other. One end of the gear assembly is connected to the elastic member. The elastic member is deformed by compression between the gear assembly and the base, thereby tightly engaging the elastic portions between the gear assembly and the base.

[0006] Thus, the gear pump structure of the present invention can effectively prevent leakage by generating pressure-holding and oil-sealing effects through the elastic member with a height difference.

[0007] Other embodiments of the aforementioned embodiment are as follows: The aforementioned protrusion distances include a first protrusion distance and a second protrusion distance, and the elastic portions include a first elastic portion, a second elastic portion, and a third elastic portion. The first elastic portion has a first protrusion distance relative to the base. The second elastic portion is connected to the first elastic portion and located outside the first elastic portion. The third elastic portion is connected to the second elastic portion and located outside the second elastic portion. The third elastic portion has a second protrusion distance relative to the base, and the second protrusion distance is greater than the first protrusion distance.

[0008] Other embodiments of the aforementioned embodiment are as follows: the aforementioned first elastic portion is heart-shaped and has a first thickness, the second elastic portion is annular and has a second thickness, the third elastic portion is annular and has a third thickness, the first thickness is greater than the second thickness, and the third thickness is greater than the first thickness.

[0009] Other embodiments of the aforementioned embodiment are as follows: The aforementioned gear pump structure further includes another elastic member and an end cap. This other elastic member is connected to the other end of the gear assembly and has the same structure as the elastic member. The end cap is disposed at the other end of the gear assembly and connected to the other elastic member, with the end cap facing the base. Furthermore, the gear assembly includes a housing and two gears. The housing defines a gear housing space. The two gears are disposed in the gear housing space and mesh with each other.

[0010] Other examples of the aforementioned embodiment are as follows: The aforementioned gear pump structure further includes a pressure relief column, which is arranged between the end cover and the base, and includes a pressure relief column housing, an elastomer, a gasket and a blocking member. The pressure relief column housing has a receiving space and a pressure relief channel. The elastomer is arranged in the receiving space. The gasket is arranged in the receiving space and is connected to the elastomer. The blocking member is arranged in the receiving space and is connected to the gasket. The blocking member is located at one end of the pressure relief channel. The blocking member is detachably connected to the pressure relief column housing through the elastomer and the gasket to open and close the pressure relief channel.

[0011] According to another embodiment of the structural aspect of the present invention, an electronic hydraulic power steering system is provided, which includes an oil pot structure and a gear pump structure. The oil pot structure has an oil pot accommodating space. The gear pump structure is arranged in the oil pot accommodating space and includes a base, an elastic member and a gear assembly. The base includes a plurality of grooves. The elastic member is protruding from these grooves and includes a plurality of elastic parts. These elastic parts have a plurality of protruding distances relative to the base, and these protruding distances are different from each other. One end of the gear assembly is connected to the elastic member. The elastic member is squeezed and deformed by the gear assembly and the base, so that these elastic parts are tightly engaged between the gear assembly and the base.

[0012] Thus, the gear pump structure of the electronic hydraulic power steering system of the present invention can effectively prevent leakage by generating pressure holding and oil sealing effects through the elastic member with a height difference.

[0013] Other embodiments of the aforementioned embodiment are as follows: The aforementioned protrusion distances include a first protrusion distance and a second protrusion distance, and the elastic portions include a first elastic portion, a second elastic portion, and a third elastic portion. The first elastic portion has a first protrusion distance relative to the base. The second elastic portion is connected to the first elastic portion and located outside the first elastic portion. The third elastic portion is connected to the second elastic portion and located outside the second elastic portion. The third elastic portion has a second protrusion distance relative to the base, the second protrusion distance being greater than the first protrusion distance. The first elastic portion is heart-shaped and has a first thickness, the second elastic portion is annular and has a second thickness, and the third elastic portion is annular and has a third thickness. The first thickness is greater than the second thickness, and the third thickness is greater than the first thickness.

[0014] Other embodiments of the aforementioned embodiment are as follows: The aforementioned gear pump structure further includes another elastic member and an end cap. This other elastic member is connected to the other end of the gear assembly and has the same structure as the elastic member. The end cap is disposed at the other end of the gear assembly and connected to the other elastic member, with the end cap facing the base. Furthermore, the gear assembly includes a housing and two gears. The housing defines a gear housing space. The two gears are disposed in the gear housing space and mesh with each other.

[0015] Other examples of the aforementioned embodiment are as follows: The aforementioned gear pump structure further includes a pressure relief column, which is arranged between the end cover and the base, and includes a pressure relief column housing, an elastomer, a gasket and a blocking member. The pressure relief column housing has a receiving space and a pressure relief channel. The elastomer is arranged in the receiving space. The gasket is arranged in the receiving space and is connected to the elastomer. The blocking member is arranged in the receiving space and is connected to the gasket, and the blocking member is located at one end of the pressure relief channel. The blocking member is detachably connected to the pressure relief column housing through the elastomer and the gasket to open and close the pressure relief channel.

[0016] Other embodiments of the aforementioned embodiment are as follows: The aforementioned oil pot structure includes an oil return pipe joint connected to the oil pot housing space. A virtual extension line of the oil return pipe joint toward the gear pump structure and an edge of the gear pump structure form a virtual oil return path. The gear pump structure further includes a blocking portion protruding from the end cap and located on the virtual oil return path to prevent oil from flowing along the virtual oil return path. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a perspective schematic diagram illustrating a gear pump structure according to a first embodiment of the present invention;

[0018] FIG2 is a cross-sectional view of the gear pump structure of FIG1 taken along section line 2-2;

[0019] FIG3 is an exploded view illustrating the gear pump structure of FIG1 ;

[0020] FIG4 is a schematic diagram illustrating a base combined with an elastic member of the gear pump structure of FIG3 ;

[0021] FIG5 is a schematic diagram illustrating the elastic member of FIG4;

[0022] FIG6 is a cross-sectional view taken along section line 6-6 of FIG4 after the base and the elastic member are combined;

[0023] 7A is a side perspective view of a pressure relief column of the gear pump structure of FIG. 3 ;

[0024] FIG7B is an exploded view of the pressure relief column of FIG7A ;

[0025] FIG8 is a perspective schematic diagram illustrating an electronic hydraulic power steering system according to a second embodiment of the present invention;

[0026] FIG9 is an exploded view of the electronic hydraulic power steering system of FIG8 ;

[0027] FIG10 is a top perspective view of the electronic hydraulic power steering system of FIG8; and

[0028] FIG. 11 is a side perspective view illustrating the electronic hydraulic power steering system of FIG. 8 .

[0029] [Description of symbols] 10: Electronic hydraulic power steering system 100: Gear pump structure 110: Base 112: Groove 120, 140: Elastic member 122: First elastic portion 124: Second elastic portion 126: Third elastic portion 130: Gear assembly 132: Accommodation body 1322: Gear accommodating space 134: Gear 150: End cover 160: Fixing member 170: Pressure relief column 172: Pressure relief column housing 1722: First housing 1724: Second housing 174: Elastic body 176: Gasket 1 78: Blocking member 180: Blocking portion 200: Oil pot structure 210: Oil return pipe joint 300: Housing terminal structure 400: Motor structure 410: Motor 420: Heat dissipation structure 500: Bracket structure AS: Accommodation space CH: Pressure relief channel D1: First protrusion distance D2: Second protrusion distance OAS: Oil pot accommodation space OP1: Virtual oil return path OP2, OP3: Actual oil return path T1: First thickness T2: Second thickness T3: Third thickness X, Y, Z: Axial direction DETAILED DESCRIPTION

[0030] The following describes various embodiments of the present invention with reference to the accompanying drawings. For clarity, many practical details will be included in the following description. However, it should be understood that these practical details are not intended to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not essential. Furthermore, to simplify the drawings, some commonly used structures and components are depicted in simplified schematic form; and duplicate components may be represented using the same reference numerals.

[0031] In addition, in this article, when an element (or component or assembly, etc.) is "connected" to another element, it may mean that the element is directly connected to the other element, or it may mean that the element is indirectly connected to the other element, that is, there are other elements between the element and the other element. When it is explicitly stated that an element is "directly connected" to another element, it means that there are no other elements between the element and the other element. The terms "first", "second", "third", etc. are only used to describe different elements and do not limit the elements themselves. Therefore, the first element can also be renamed as the second element. Moreover, the combination of elements / components / assemblies in this article is not a generally known, conventional or customary combination in this field. Whether the elements / components / assemblies themselves are known cannot be used to determine whether their combination relationship can be easily completed by ordinary knowledge in the technical field.

[0032] Please refer to Figures 1, 2, and 3. Figure 1 is a schematic perspective view of a gear pump structure 100 according to a first embodiment of the present invention; Figure 2 is a cross-sectional view of the gear pump structure 100 of Figure 1 taken along line 2-2; and Figure 3 is an exploded view of the gear pump structure 100 of Figure 1. The gear pump structure 100 includes a base 110, an elastic member 120, and a gear assembly 130. The base 110 includes a plurality of grooves 112. The elastic member 120 protrudes from the grooves 112 and includes a plurality of elastic portions. The elastic portions have a plurality of protrusion distances relative to the base 110, and these protrusion distances are different from each other. One end of the gear assembly 130 is connected to the elastic member 120. The elastic member 120 is squeezed and deformed by the gear assembly 130 and the base 110, thereby allowing the elastic portion to be tightly engaged between the gear assembly 130 and the base 110. Thus, the gear pump structure 100 of the present invention achieves pressure holding and oil sealing effects through the elastic member 120 of the special structure, which can effectively prevent leakage.

[0033] In detail, the gear pump structure 100 further includes another elastic member 140, an end cap 150, and a plurality of fixing members 160. The other elastic member 140 is connected between the other end of the gear assembly 130 and the end cap 150. The structure of the other elastic member 140 is the same as that of the elastic member 120. The end cap 150 is disposed at the other end of the gear assembly 130 and is connected to the other elastic member 140. The end cap 150 is opposite to the base 110. The fixing member 160 is inserted between the end cap 150 and the base 110. The base 110 and the end cap 150 can be screwed together by the fixing member 160, so that the base 110, the gear assembly 130, and the end cap 150 are pressed and fixed to each other, thereby squeezing the elastic member 120 and the other elastic member 140. In addition, the gear assembly 130 includes a housing 132 and two gears 134. The housing 132 has a gear accommodating space 1322. The two gears 134 are disposed in the gear accommodation space 1322 and mesh with each other. In this embodiment, each gear 134 has 11 teeth, a tooth thickness of 12 mm, and a rotational speed of 4200 rpm. The cross-sectional area (in the plane formed by the axial directions X and Y) of two adjacent teeth that do not overlap (the teeth of the two gears 134 that are not connected) is 7.415 mm. 2 , its volume is 0.00008898L(7.415mm 2 ×12mm=88.98mm 3 = 0.00008898L); the cross-sectional area (in the plane formed by the axial directions X and Y) of the two overlapping adjacent teeth (the teeth connected to the two gears 134) is 3.594mm 2 , its volume is 0.000043128L (3.594mm 2 ×12mm=43.128mm 3 = 0.000043128 L). The theoretical volume of these two gears 134 per full rotation can be calculated by calculating the number of teeth, tooth thickness, rotational speed, and cross-sectional area: 6.2292384 L (0.00008898 × ​​11 × 2 × 4200 - 0.000043128 × 11 × 4200 = 8.221752 - 1.9925136 = 6.2292384). Each gear 134 undergoes grinding and heat treatment to maintain wear resistance.

[0034] In other embodiments, the structure of the elastic member may differ from that of another elastic member, depending on the structure of the base and end cap, as well as the application requirements. The number and shape of the fixing members, the number of teeth on each gear, the tooth thickness, the rotational speed, and the cross-sectional area may also vary depending on the application requirements, and the present invention is not limited to the foregoing.

[0035] Please refer to Figures 3, 4, 5, and 6. Figure 4 is a schematic diagram illustrating the base 110 of the gear pump structure 100 of Figure 3 in combination with the elastic member 120; Figure 5 is a schematic diagram illustrating the elastic member 120 of Figure 4; and Figure 6 is a cross-sectional view taken along section line 6-6 of the base 110 and elastic member 120 of Figure 4 after they are combined. The base 110 is combined with the elastic member 120 by engaging the multiple elastic portions of the elastic member 120 with the multiple grooves 112 of the base 110. The elastic portion of the elastic member 120 includes a first elastic portion 122, a second elastic portion 124, and a third elastic portion 126. The first elastic portion 122 protrudes a first distance D1 (along the axial direction Z) relative to the base 110. The second elastic portion 124 is connected to the first elastic portion 122 and is located outside the first elastic portion 122. The third elastic portion 126 is connected to the second elastic portion 124 and is located outside the second elastic portion 124. The third elastic portion 126 protrudes from the base 110 by a second distance D2 (along the axial direction Z). In other words, the multiple protrusion distances of the elastic portion of the elastic member 120 relative to the base 110 include a first distance D1 and a second distance D2, with the second distance D2 being greater than the first distance D1. The protrusion distance represents the distance between the top surface of the base 110 and the top surface of the corresponding elastic portion and is equal to the thickness of the elastic portion minus the depth of the corresponding groove 112.

[0036] In this embodiment, the first elastic portion 122 is heart-shaped and has a first thickness T1 (along the axial direction Z), the second elastic portion 124 is annular and has a second thickness T2 (along the axial direction Z), and the third elastic portion 126 is annular and has a third thickness T3 (along the axial direction Z). The first thickness T1 is greater than the second thickness T2, and the third thickness T3 is greater than the first thickness T1. The first elastic portion 122, the second elastic portion 124, and the third elastic portion 126 are respectively embedded in the three grooves 112, and the first elastic portion 122, the second elastic portion 124, and the third elastic portion 126 are integrally formed. Furthermore, first elastic portions 122, second elastic portions 124, and third elastic portions 126 of different thicknesses can be used with grooves 112 of different depths. For example, the first thickness T1 of the first elastic portion 122, the second thickness T2 of the second elastic portion 124, and the third thickness T3 of the third elastic portion 126 may be 1.7 mm, 1.6 mm, and 2.15 mm, respectively. The corresponding depths of the three grooves 112 may be 1.6 mm, 1.6 mm, and 1.9 mm, respectively. The first protrusion distance D1 is equal to 0.1 mm (1.7 mm - 1.6 mm), and the second protrusion distance D2 is equal to 0.25 mm (2.15 mm - 1.9 mm). The second protrusion distance D2 is greater than the first protrusion distance D1.

[0037] In other embodiments, the first, second, and third elastic portions of the same thickness may be configured with grooves of different depths. For example, the first thickness of the first elastic portion, the second thickness of the second elastic portion, and the third thickness of the third elastic portion may all be 1.6 mm, and the corresponding groove depths of the three grooves may be 1.5 mm, 1.6 mm, and 1.35 mm, respectively. The first protrusion distance is equal to 0.1 mm (1.6 mm - 1.5 mm), and the second protrusion distance is equal to 0.25 mm (1.6 mm - 1.35 mm), with the second protrusion distance being greater than the first protrusion distance.

[0038] In other embodiments, the first, second, and third elastic portions of different thicknesses may be used with grooves of the same depth. For example, the first thickness of the first elastic portion, the second thickness of the second elastic portion, and the third thickness of the third elastic portion may be 1.7 mm, 1.6 mm, and 1.85 mm, respectively, and the corresponding groove depths of the three grooves may all be 1.6 mm. The first protrusion distance is equal to 0.1 mm (1.7 mm - 1.6 mm), and the second protrusion distance is equal to 0.25 mm (1.85 mm - 1.6 mm). The second protrusion distance is greater than the first protrusion distance, but the present invention is not limited to this.

[0039] Please refer to Figures 3, 7A, and 7B. Figure 7A is a side perspective view of the pressure relief column 170 of the gear pump structure 100 of Figure 3, and Figure 7B is an exploded view of the pressure relief column 170 of Figure 7A. The gear pump structure 100 further includes a pressure relief column 170, which is disposed between the end cap 150 and the base 110 and includes a pressure relief column housing 172, an elastic body 174, a gasket 176, and a blocking member 178. The pressure relief column housing 172 includes a first housing 1722 and a second housing 1724. The first housing 1722 has an accommodating space AS, and the second housing 1724 has a pressure relief channel CH. The first housing 1722 is detachably connected to the second housing 1724. The elastic body 174 is disposed in the accommodating space AS. The gasket 176 is disposed in the accommodating space AS and is connected to the elastic body 174. The blocking member 178 is arranged in the accommodating space AS and is connected to the gasket 176. The blocking member 178 is located at one end of the pressure relief channel CH. The blocking member 178 is detachably connected to the second shell 1724 of the pressure relief column shell 172 through the elastomer 174 and the gasket 176 to open and close the pressure relief channel CH. In the present embodiment, the blocking member 178 is a sphere and the elastomer 174 is a spring. In other embodiments, the blocking member may be a cone or a cylinder, and the present invention is not limited to the above. Thereby, the pressure relief column 170 of the gear pump structure 100 of the present invention generates pre-pressure to block the pressure relief channel CH through the elastomer 174 and the blocking member 178, and uses the gasket 176 to increase the spring pre-pressure to adjust and control the safety pressure relief pressure.

[0040] Please refer to Figures 3, 8, 9, 10, and 11, wherein Figure 8 is a perspective view of an electronic hydraulic power steering (EHPS) system 10 according to a second embodiment of the present invention; Figure 9 is an exploded view of the EHPS system 10 of Figure 8; Figure 10 is a top perspective view of the EHPS system 10 of Figure 8; and Figure 11 is a side perspective view of the EHPS system 10 of Figure 8. The EHPS system 10 includes a gear pump structure 100, an oil tank structure 200, a housing terminal structure 300, a motor structure 400, and a bracket structure 500.

[0041] The gear pump structure 100 includes a base 110, an elastic member 120, a gear assembly 130, another elastic member 140, an end cap 150, a plurality of fixing members 160, a pressure relief column 170, and a barrier portion 180. The structures of the base 110, elastic member 120, gear assembly 130, another elastic member 140, end cap 150, a plurality of fixing members 160, and the pressure relief column 170 are respectively identical to the structures of the base 110, elastic member 120, gear assembly 130, another elastic member 140, end cap 150, a plurality of fixing members 160, and the pressure relief column 170 in FIG3 , and are not further described. The barrier portion 180 is protruded from the end cap 150 (extending in the axial direction X) and has an arcuate shape.

[0042] The oiler structure 200 has an oiler accommodating space OAS, and the gear pump structure 100 is disposed within the oiler accommodating space OAS. In other words, the oiler structure 200 is disposed outside the gear pump structure 100. The oiler structure 200 includes an oil return pipe connector 210 that connects to the oiler accommodating space OAS. A virtual extension line of the oil return pipe connector 210 toward the gear pump structure 100 and the edge of the gear pump structure 100 (along the axial direction Z) form a virtual oil return path OP1.

[0043] The housing terminal structure 300 connects the gear pump structure 100 and the oil tank structure 200 and can be used to connect an external power source or signal line. The motor structure 400 connects the gear pump structure 100 and the housing terminal structure 300 and can be used to drive the gear pump structure 100. The bracket structure 500 is disposed on the housing terminal structure 300 and can be used to support the housing terminal structure 300 and connect to other vehicle components. Furthermore, the blocking portion 180 of the gear pump structure 100 is located on the virtual oil return path OP1 to prevent oil from flowing along the virtual oil return path OP1. In other words, after the oil originally flows from the return oil pipe joint 210 into the oil tank accommodating space OAS of the oil tank structure 200, it will flow along the virtual oil return path OP1. However, the blocking portion 180 can change the oil flow path, causing the oil to flow along the actual oil return paths OP2 and OP3. Thus, the electronic hydraulic power steering system 10 of the present invention sets a blocking portion 180 on the gear pump structure 100 according to the virtual oil return path OP1. The blocking portion 180 can effectively prevent and reduce oil surface disturbance caused by the original oil body flowing along the virtual oil return path OP1.

[0044] In this embodiment, the motor structure 400 includes a motor 410 and a heat dissipation structure 420. The motor 410 includes a rotating shaft, which passes through the housing terminal structure 300 and is connected to the gear pump structure 100 to drive the gear pump structure 100. The heat dissipation structure 420 is arranged on the outside of the motor 410 and is used to dissipate the heat generated by the motor 410. The heat dissipation structure 420 includes a plurality of heat dissipation fins, each of which is strip-shaped and made of aluminum alloy to increase the heat dissipation area and lightweight effect. In other embodiments, each heat dissipation fin may be L-shaped or made of other lightweight materials, and the present invention is not limited to the above.

[0045] It can be seen from the above embodiments that the present invention has the following advantages: First, the pressure holding and oil sealing effects are achieved through elastic parts with height differences, which can effectively prevent leakage. Second, the pressure relief column generates pre-pressure through the elastic body and the blocking part to block the pressure relief channel, and the spring pre-load is increased by using a gasket, so that the safety pressure relief pressure can be adjusted and controlled. Third, the mutual arrangement of the housing and the gears of the gear assembly can achieve smooth gear meshing. Fourth, the barrier part can effectively prevent and mitigate the oil surface disturbance caused by the original oil body flowing along the virtual oil return path. Fifth, the heat dissipation fins of the heat dissipation structure are strip-shaped and made of aluminum alloy, which can increase the heat dissipation area and lightweight effect.

[0046] Although the present invention has been disclosed above in terms of embodiments, this is not intended to limit the present invention. Anyone skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A gear pump structure, characterized in that, Comprising: A base, comprising a plurality of grooves; An elastic member, protruding from the plurality of grooves and comprising a plurality of elastic parts, the plurality of elastic parts having a plurality of protruding distances relative to the base, the plurality of protruding distances being different from each other; and A gear assembly, one end of the gear assembly being connected to the elastic member; Wherein, the elastic member is deformed by the extrusion of the gear assembly and the base, so as to make the plurality of elastic parts closely engage between the gear assembly and the base.

2. The gear pump structure according to claim 1, characterized in that, The plurality of protruding distances include a first protruding distance and a second protruding distance, and the plurality of elastic parts include: A first elastic part, having the first protruding distance relative to the base; A second elastic part, connected to the first elastic part and located outside the first elastic part; and A third elastic part, connected to the second elastic part and located outside the second elastic part, the third elastic part having the second protruding distance relative to the base, the second protruding distance being greater than the first protruding distance.

3. The gear pump structure according to claim 2, wherein, The first elastic part is heart-shaped and has a first thickness, the second elastic part is annular and has a second thickness, the third elastic part is annular and has a third thickness, the first thickness is greater than the second thickness, and the third thickness is greater than the first thickness.

4. The gear pump structure according to claim 1, wherein, Further comprising: Another elastic member, connected to the other end of the gear assembly, the structure of the other elastic member being the same as that of the elastic member; and An end cap, disposed at the other end of the gear assembly and connected to the other elastic member, the end cap being opposite to the base; Wherein, the gear assembly includes: A housing, having a gear accommodation space; and Two gears, disposed in the gear accommodation space and meshing with each other.

5. The gear pump structure according to claim 4, wherein, Further comprising: A pressure relief column, disposed between the end cap and the base and comprising: A pressure relief column housing, having an accommodation space and a pressure relief channel; An elastic body, disposed in the accommodation space; A gasket, disposed in the accommodation space and connected to the elastic body; and A blocking member, disposed in the accommodation space and connected to the gasket, the blocking member being located at one end of the pressure relief channel; Wherein, the blocking member is separably connected to the pressure relief column housing through the elastic body and the gasket to open and close the pressure relief channel.

6. An electronic hydraulic power steering system, characterized in that, Comprising: An oil pot structure, having an oil pot accommodation space; and A gear pump structure, disposed in the oil pot accommodation space and comprising: A base, comprising a plurality of grooves; An elastic member, protruding from the plurality of grooves and comprising a plurality of elastic parts, the plurality of elastic parts having a plurality of protruding distances relative to the base, the plurality of protruding distances being different from each other; and A gear assembly, one end of the gear assembly being connected to the elastic member; Wherein, the elastic member is deformed by the extrusion of the gear assembly and the base, so as to make the plurality of elastic parts closely engage between the gear assembly and the base.

7. The electronic hydraulic power steering system according to claim 6, wherein The plurality of protruding distances include a first protruding distance and a second protruding distance, and the plurality of elastic parts include: A first elastic part, having the first protruding distance relative to the base; A second elastic part, connected to the first elastic part and located outside the first elastic part; and A third elastic part, connecting the second elastic part and located outside the second elastic part, has a second protruding distance relative to the base, and the second protruding distance is greater than the first protruding distance; Wherein, the first elastic part is heart-shaped and has a first thickness, the second elastic part is annular and has a second thickness, the third elastic part is annular and has a third thickness, the first thickness is greater than the second thickness, and the third thickness is greater than the first thickness.

8. The electronic hydraulic power steering system according to claim 6, wherein, The gear pump structure further includes: Another elastic member, connected to the other end of the gear assembly, and the structure of the other elastic member is the same as that of the elastic member; and An end cover, arranged at the other end of the gear assembly and connected to the other elastic member, and the end cover is relative to the base; Wherein, the gear assembly includes: A housing body, having a gear accommodation space; and Two gears, arranged in the gear accommodation space and meshing with each other.

9. The electronic hydraulic power steering system according to claim 8, characterized in that, The gear pump structure further includes: A pressure relief column, arranged between the end cover and the base, and includes: A pressure relief column housing, having an accommodation space and a pressure relief channel; An elastic body, arranged in the accommodation space; A gasket, arranged in the accommodation space and connected to the elastic body; and A blocking member, arranged in the accommodation space and connected to the gasket, and the blocking member is located at one end of the pressure relief channel; Wherein, the blocking member is separably connected to the pressure relief column housing through the elastic body to open and close the pressure relief channel.

10. The electronic hydraulic power steering system according to claim 8, wherein The oil pot structure includes: A return oil pipe joint, connecting the oil pot accommodation space, and a virtual extension line of the return oil pipe joint facing the gear pump structure forms a virtual return oil path with the edge of the gear pump structure; and The gear pump structure further includes: A blocking part, protruding from the end cover and located on the virtual return oil path, so as to prevent an oil body from flowing along the virtual return oil path.

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