A stable rotor type oil pump

Abstract

The present invention relates to the field of variable displacement mechanical pumps, specifically a stable rotor type oil pump, which structure includes a pump body and a pump cover, a concave matching groove is provided at the bottom of the inner cavity of the pump body, a cavity ring is installed in the matching groove, the cavity ring cooperates with an inner rotor, an outer rotor and the pump cover to form a pump cavity, a driving assembly is provided on the pump body and is connected with the cavity ring to enable the cavity ring to change the position of the working surface of the pump cavity formed by it. The present invention provides a cavity ring on the inner side of the pump body to cooperate with the inner rotor, the outer rotor and the pump cover to form a pump cavity, so that the structural part of the pump cavity formed on the pump body is separately arranged and realized by the cavity ring. When cavitation affects the pump body, it only needs to remove and replace the cavity ring, so that the oil pump can be quickly repaired to ensure the stable use of the oil pump, and a driving assembly is provided on the pump body to drive the cavity ring to rotate intermittently, so that the cavity ring changes the position of the working surface of the pump cavity formed by it, so that the single use time of the cavity ring is longer.

Description

Technical Field

[0001] The invention relates to the field of variable displacement mechanical pumps, in particular to a stable rotor type oil pump. Background Art

[0002] A variable displacement mechanical pump is a pump that uses the change in the volume of the pump's internal cavity to achieve fluid suction and discharge. It is widely used in various industrial and automotive fields. For example, a rotor oil pump is an important component in an internal combustion engine system. A rotor oil pump usually consists of a pair of rotors, a pump body, a pump cover, etc. The rotation of the rotor is used to change the volume of the pump cavity, thereby achieving the suction and discharge of oil.

[0003] When the pump is in use, cavitation occurs, which refers to the phenomenon that when there is gas or vapor in the liquid, the gas or vapor precipitates from the liquid to form bubbles due to the pressure reduction, and then the bubbles collapse rapidly when the pressure increases, causing high-frequency impact and local erosion on the material surface; in a rotor oil pump, the rotor rotates to increase the volume of the pump chamber and produce negative pressure, thereby sucking in oil, and then the rotor continues to rotate to reduce the volume of the pump chamber and increase the pressure, thereby discharging the oil. Due to the increase in the volume of the pump chamber and the decrease in pressure, cavitation will occur when the pressure drops below the saturation pressure of the gas or vapor in the oil. When the oil temperature is too high, the solubility of the gas or vapor therein will decrease, increasing the risk of cavitation. Moreover, with use, the higher the pump speed, the more drastic the pressure change in the pump chamber, and the more likely cavitation will occur.

[0004] In the prior art, the rotor-type oil pump occurs in a pump chamber, which is formed by the inner and outer rotors and the inner walls of the pump body and pump cover. Cavitation will damage these structures and reduce the actual flow rate of the pump. This uncontrollable situation makes the use of the pump relatively unstable. In practice, the structure of components such as the rotor and pump cover is relatively simple, low in cost, and easy to replace, while the pump body is the main structure of the oil pump, which has a complex structure and is more troublesome to replace, and is more inconvenient in actual maintenance. Summary of the invention

[0005] In view of the above problems, the present invention provides a stable rotor type oil pump, the structure of which includes a pump body provided with an inner cavity and a pump cover arranged at the open end of the inner cavity, the inner cavity is also nested with an inner rotor and an outer rotor, and the pump body is provided with a driving wheel, wherein the pump body is provided with an outward through hole, the through hole is eccentrically arranged with the inner cavity, the driving wheel is provided with a main rotating shaft, and the main rotating shaft passes through the through hole and is connected with the inner rotor; the bottom of the inner cavity is a side opposite to the pump cover and is provided with a concave matching groove, the matching groove is concentrically arranged with the inner cavity, a cavity surface ring is installed in the matching groove, and the cavity surface ring The ring cooperates with the inner rotor, the outer rotor and the pump cover to form a pump chamber; an assembly reference surface of the cavity surface ring is provided on the bottom of the matching groove, and the inner and outer sides of the cavity surface ring located in the matching groove are clearance-matched with the inner and outer sides of the matching groove, and the bottom of the inner cavity forms a center island on the inner side of the matching groove and the through hole is located in the center island; two pump ports are provided on the pump cover for liquid to enter and exit the pump chamber, and the projection area of ​​the cavity surface ring on the pump cover is larger than the area of ​​the pump port and does not intersect with the area of ​​the pump port; a driving assembly is provided on the pump body and is connected to the cavity surface ring to enable the cavity surface ring to change the working surface position of the pump chamber formed by it.

[0006] Furthermore, a toothed surface is provided on one side of the cavity surface ring close to the inner cavity, and the toothed surface is perpendicular to the back side of the cavity surface ring. The driving assembly includes a first transmission gear provided at the bottom of the mating groove through a rotating shaft structure, and the first transmission gear is meshed with the toothed surface to drive the cavity surface ring to rotate.

[0007] Furthermore, the back side of the cavity ring has a layered protrusion structure and cooperates with the cavity ring to form a first-level step with two different thicknesses, and the tooth surface is arranged on the side of the step structure; a layered protrusion mating step is extended from the bottom of the mating groove, and there is a spacing space between the mating step and the inner wall of one side of the mating groove, and the layered protrusion structure on the back side of the cavity ring is embedded and engaged in the spacing space between the mating step and the inner wall of the mating groove, and the side of the back side of the cavity ring located outside the spacing space is fit and matched with the end face of the mating step; the first transmission gear is located in the mating step and meshes with the tooth surface in the spacing space.

[0008] Furthermore, the mating step end surface at the bottom of the mating groove is an assembly reference surface, or the inner end surface of the spacing space at the bottom of the mating groove and the mating step end surface at the bottom of the mating groove are both assembly reference surfaces; the outer surface of the cavity surface ring is flush with or deeper than the bottom surface of the inner cavity in the mating groove, and the deep direction is the direction pointing to the bottom of the mating groove.

[0009] Furthermore, the rotating shaft structure of the first transmission gear is provided with a wheel structure outside the pump body, and the wheel structure is in transmission cooperation with the main rotating shaft where the driving wheel is located.

[0010] Furthermore, the drive assembly also includes a second transmission gear, which is mounted on the main shaft and coaxially connected to the driving wheel, and the second transmission gear is located between the pump body and the driving wheel; the drive assembly also includes a third transmission gear, which is arranged on the pump cover at the side end of the second transmission gear and meshes with the second transmission gear, and the wheel structure of the first transmission gear is transmitted and matched with the second transmission gear through the third transmission gear.

[0011] Further, the wheel structure of the first transmission gear is a synchronous indexing wheel, and a recessed tooth groove is arranged around the synchronous indexing wheel; a circular guide groove is arranged around the inner side of the third transmission gear, and a recessed and movable protruding give-way groove is arranged on the guide groove path, and the recessed direction of the give-way groove points to the direction of the axis of the third transmission gear and the protrusion can be moved in the opposite direction; the inner part of the third transmission gear forms a cam structure through the guide groove and the recessed give-way groove, or forms a circular ring structure through the guide groove and the raised give-way groove; a connecting rod-type driving arm is arranged between the synchronous indexing wheel and the third transmission gear, the head end of the driving arm cooperates with the guide groove and the give-way groove and the end contacts with the synchronous indexing wheel, and an elastic member is arranged between the driving arm and the pump body to drive the driving arm to swing in the direction of the third transmission gear, and the head end of the driving arm cooperates with the guide groove and the recessed give-way groove to transmit part of the rotation of the third transmission gear to the synchronous indexing wheel.

[0012] Furthermore, a shaft is provided in the middle part of the driving arm, and the driving arm is mounted on the pump body through a rotating shaft structure and in cooperation with the shaft; a follower wheel is provided at the front end of the driving arm, and the follower wheel is engaged in the guide groove and the give-way groove; a pawl is provided at the end of the driving arm, and the pawl is swingably mounted at the end of the driving arm and an elastic member is provided between the pawl and the driving arm, and the elastic member provides an elastic force for swinging the pawl in the direction of the third transmission gear; there are gaps between the two ends of the driving arm and the recessed give-way groove close to it and the tooth groove of the synchronous dividing wheel close to it, respectively, so that the driving arm has the freedom to swing between the recessed give-way groove and the synchronous dividing wheel.

[0013] Furthermore, when the follower wheel of the driving arm is located in the recessed give way groove, the connection point between its end and the pawl, the end of the pawl, and the center point of the synchronous dividing wheel form a triangle, which is an obtuse triangle. The obtuse angle tip of the obtuse triangle points in the direction in which the driving arm swings after the follower wheel moves from the recessed give way groove to the guide groove.

[0014] Furthermore, the give way groove part in the third transmission gear is formed by a strip-shaped displacement strip, the guide groove and the give way groove near the middle part of the third transmission gear have a cavity, and the displacement strip is equipped with a counterweight block on the inner side of the cavity; a tension spring is connected between the counterweight block and the inside of the cavity, and the tension spring provides a pulling force to drive the displacement strip and the counterweight block to move toward the middle part of the third transmission gear; the displacement strip forms a concave give way groove under the cooperation of the counterweight block and the tension spring, and then forms a cam structure with the guide groove; the displacement strip starts to bulge outward as a whole when the third transmission gear rotates to the point where the displacement strip and the counterweight block form a circular ring structure with the guide groove.

[0015] Furthermore, the displacement strip is made of metal, and takes the arc state of the circular ring structure as a basic state and is concave toward the middle of the third transmission gear as a deformation state.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention provides a cavity surface ring inside the pump body, and the cavity surface ring cooperates with the inner rotor, the outer rotor and the pump cover to form a pump cavity for pumping oil, so that the structural part forming the pump cavity on the pump body is separately arranged and realized by the cavity surface ring. When the cavity surface ring of the pump cavity is damaged due to cavitation and needs to be repaired, it is only necessary to remove and replace the cavity surface ring without replacing the entire pump body, which facilitates the rapid repair of the oil pump to ensure the stable use of the oil pump.

[0018] 2. The present invention provides a driving assembly on the pump body, a first transmission gear meshing with the cavity surface ring is provided inside the pump body, and a second transmission gear coaxially arranged with the driving wheel is used outside the pump body to rotate and drive the pump body. The third transmission gear and the driving arm cooperate to drive the synchronous dividing wheel axially connected to the first transmission gear to rotate intermittently, so that the cavity surface ring is intermittently rotated to change the working surface position of the pump cavity formed by it, so that the cavity surface ring can be used for a longer time at a time.

[0019] 3. The present invention provides a guide groove and a convertible give way groove on the inner side of the third transmission gear, and utilizes the recessed give way groove to cooperate with the guide groove to form a cam mechanism, thereby driving the driving arm to swing, so that the ratchet moves back and forth on the synchronous indexing wheel to move the synchronous indexing wheel, and then the cavity surface ring intermittently moves within a rotation cycle of the third transmission gear, and the give way groove is protruded by the driving to make the give way groove cooperate with the guide groove to form a circular ring mechanism. Since the circular track cannot make the driving arm swing and the synchronous indexing wheel is fixed, the cavity surface ring that intermittently moves does not move under a certain working state, thereby avoiding unnecessary power consumption increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a schematic diagram of the three-dimensional structure of a stable rotor type oil pump and two types of pump covers of the present invention.

[0021] Figure 2 This is a schematic diagram of the structural explosion of a stable rotor type oil pump of the present invention.

[0022] Figure 3 It is a front structural schematic diagram of the working surface of the cavity face ring of the present invention and a top view partial cross-sectional schematic diagram of the cooperation between the cavity face ring and the matching groove.

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the matching slot layout and drive component layout of the present invention.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the cooperation between the drive assembly and the cavity surface ring of the present invention.

[0025] Figure 6 It is a schematic diagram of the working state of the driving component of the present invention.

[0026] Figure 7 It is a schematic diagram of the transformation of the give way slot of the present invention.

[0027] In the figure: 1. pump body; 2. pump cover; 3. inner rotor; 4. outer rotor; 5. main shaft; 6. driving wheel; 7. cavity surface ring; 8. drive assembly;

[0028] 1a, inner cavity; 1b, matching groove; 1c, center island; 1d, matching step; 2a, pump port; 7a, tooth surface; 81, first transmission gear; 82, synchronous indexing wheel; 83, second transmission gear; 84, third transmission gear; 85, driving arm;

[0029] 84a, guide groove; 84b, give way groove; 841, displacement bar; 842, counterweight block; 843, tension spring; 851, follower wheel; 852, pawl; 85a, shaft. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Examples, such as Figure 1-Figure 7As shown: The present invention provides a stable rotor type oil pump, including a basic rotor type pump structure, specifically including a pump body 1 provided with an inner cavity 1a and a pump cover 2 provided at the open end of the inner cavity 1a, an inner rotor 3 and an outer rotor 4 are nested in the inner cavity 1a, and a driving wheel 6 is provided outside the pump body 1, an outward through hole is provided in the pump body 1, the through hole is eccentrically arranged with the inner cavity 1a, the driving wheel 6 is provided with a main rotating shaft 5 and the main rotating shaft 5 passes through the through hole and is connected with the inner rotor 3, the driving wheel 6 rotates through the main rotating shaft 5 to drive the inner rotor 3 to rotate, the inner rotor 3 is meshed with the outer rotor 4, and thus drives the outer rotor 4 to rotate in the inner cavity 1a;

[0032] In this embodiment, the bottom of the inner cavity 1a is a side opposite to the pump cover 2 and is provided with a concave matching groove 1b, the matching groove 1b is concentrically arranged with the inner cavity 1a, a cavity surface ring 7 is arranged in the matching groove 1b, and the cavity surface ring 7 cooperates with the inner rotor 3, the outer rotor 4 and the pump cover 2 to form a pump cavity, so that the structural part forming the pump cavity on the pump body 1 is separately arranged and realized by the cavity surface ring 7;

[0033] It should be noted that two pump ports 2a are provided on the pump cover 2 for allowing liquid to enter and exit the pump cavity. The projection area of ​​the cavity surface ring 7 on the pump cover 2 is larger than the area of ​​the pump port 2a and does not intersect with the area of ​​the pump port 2a. Moreover, a center island 1c is formed on the inner side of the matching groove 1b at the bottom of the inner cavity 1a and the through hole is located in the center island 1c. The center island 1c serves as the edge of the inner limit of the range of the pump port 2a and is used to carry out matching design in combination with the inner limit of the range of the pump port 2a, the eccentric distance between the through hole of the pump body 1 and the inner cavity 1a, so that technical personnel in this field can have margin for setting.

[0034] At the same time, the reference setting of the cavity surface ring 7 includes the end surface setting and the edge setting;

[0035] For the end surface setting: the bottom of the matching groove 1b is provided with an assembly reference surface of the cavity surface ring 7, which can be the end surface of the bottom of the matching groove 1b, or a surface of the structure extending from the bottom of the matching groove 1b and parallel to the end surface. The position of the surface of the cavity surface ring 7 is determined by the assembly reference surface. It should be noted that the outer surface of the cavity surface ring 7 is flush with or deeper than the bottom surface of the inner cavity 1a in the matching groove 1b, and the deep direction is the direction pointing to the bottom of the matching groove 1b, so as to avoid continuous friction contact between the cavity surface ring 7 and the inner rotor 3 and the outer rotor 4, so that the assembly reference of the outer rotor 4 is still mainly based on the bottom surface of the inner cavity 1a;

[0036] For the edge setting: the inner and outer sides of the cavity surface ring 7 located in the matching groove 1b are clearance-fitted with the inner and outer sides of the matching groove 1b. It should be noted that the clearance-fitting state of the cavity surface ring 7 is within the matching groove 1b. It is optional for technical personnel in this field. The matching groove 1b can be processed into a truncated cone form with a slightly narrow opening and a slightly wider bottom. Before assembly, the diameter of the cavity surface ring 7 can be equal to or slightly larger than the matching groove 1b. Then, the cavity surface ring 7 is shrunk and assembled into the matching groove 1b in the form of liquid nitrogen freezing. It is only necessary to ensure that the cavity surface ring 7 maintains a clearance fit with the matching groove 1b when it expands under high-temperature working conditions.

[0037] Due to the limitation of the thickness of the cavity surface ring 7 structure, the structures of the inner rotor 3 and the outer rotor 4 are relatively thick in the pump cavity structure surface, and the direction of oil inlet and outlet is parallel to the working surface of the inner rotor 3 and the outer rotor 4. The inner rotor 3 and the outer rotor 4 can withstand a relatively serious state. In the prior art, the negative effects caused by damage to the inner end surface of the pump body 1 perpendicular to the direction of oil inlet and outlet are usually more serious. Therefore, in order to make the maintenance time of the added cavity surface ring 7 more compatible with the inner rotor 3 and the outer rotor 4, and to make the single use time of the cavity surface ring 7 longer, in this embodiment, a drive assembly 8 is provided on the pump body 1 and connected with the cavity surface ring 7 for changing the working surface position of the pump cavity formed by the cavity surface ring 7. To this end, it includes the setting of the matching groove 1b and the setting of the drive assembly 8:

[0038] Regarding the arrangement of the matching groove 1b: a tooth surface 7a is provided on one side of the cavity surface ring 7 close to the inner cavity 1a, and the tooth surface 7a is perpendicular to the back side of the cavity surface ring 7. The back side of the cavity surface ring 7 has a layered convex structure and cooperates with the cavity surface ring 7 to form a first-level step with two different thicknesses, and the tooth surface 7a is provided on the side of the step structure;

[0039] A layered protruding mating step 1d is extended from the bottom of the mating groove 1b, and there is a spacing space between the mating step 1d and the inner wall of one side of the mating groove 1b. The layered protrusion structure on the back of the cavity ring 7 is embedded and engaged in the spacing space between the mating step 1d and the inner wall of the mating groove 1b, and the back side of the cavity ring 7 located outside the spacing space is fit together with the end face of the mating step 1d. Since the mating step 1d is an extension of the bottom of the mating groove 1b, the end face of the mating step 1d at the bottom of the mating groove 1b is the assembly reference surface, and technicians in this field can optionally set the inner end face of the spacing space at the bottom of the mating groove 1b and the end face of the mating step 1d at the bottom of the mating groove 1b as the assembly reference surface according to actual needs.

[0040] Regarding the setting of the driving assembly 8: the driving assembly 8 includes a first transmission gear 81 provided at the bottom of the matching groove 1b through a rotating shaft structure. Specifically, the first transmission gear 81 is located in the matching step 1d and meshes with the tooth surface 7a in the interval space. The first transmission gear 81 meshes with the tooth surface 7a to drive the cavity surface ring 7 to rotate. The rotating shaft structure of the first transmission gear 81 is provided with a wheel structure outside the pump body 1, and the wheel structure is matched with the main rotating shaft 5 where the driving wheel 6 is located.

[0041] The driving assembly 8 also includes a second transmission gear 83, which is mounted on the main shaft 5 and is coaxially connected to the driving wheel 6. The second transmission gear 83 is located between the pump body 1 and the driving wheel 6; the driving assembly 8 also includes a third transmission gear 84, which is arranged on the pump cover 2 at the side end of the second transmission gear 83 and meshes with the second transmission gear 83. The wheel structure of the first transmission gear 81 is matched with the second transmission gear 83 through the third transmission gear 84. In the usual setting, the rotation of the driving wheel 6 can be reduced by multi-stage gear meshing or belt transmission through the second transmission gear 81. The moving gear 83 and the third transmission gear 84 are transmitted to the wheel structure of the first transmission gear 81, but this will make the cavity surface ring 7 meshing with the first transmission gear 81 continue to be in a state of motion. In this embodiment, on the basis of the above transmission structure, the cavity surface ring 7 is allowed to intermittently move and the transmission is disconnected under a certain working state so that the cavity surface ring 7 does not move. It should be noted that it still retains the function of moving or having a movement tendency under the required working state, thereby making it unnecessary for the cavity surface ring 7 to move continuously, avoiding unnecessary increase in power consumption, and reducing unknown adverse factors caused by excessive movement;

[0042] Specifically, the wheel structure of the first transmission gear 81 is a synchronous indexing wheel 82, and a recessed tooth groove is arranged around the synchronous indexing wheel 82, which can be specifically set as a ratchet tooth groove;

[0043] Next, the synchronous indexing wheel 82 is driven to perform intermittent motion. For the intermittent motion: a circular guide groove 84a is arranged around the inner side of the third transmission gear 84, and a recessed and movable protruding paving groove 84b is arranged on the path of the guide groove 84a. The recessed direction of the paving groove 84b points to the direction of the axis of the third transmission gear 84 and can move the protrusion in the opposite direction. The inner part of the third transmission gear 84 forms a cam structure through the guide groove 84a and the recessed paving groove 84b.

[0044] At the same time, a connecting rod type driving arm 85 is provided between the synchronous indexing wheel 82 and the third transmission gear 84, and a shaft portion 85a is provided in the middle part of the driving arm 85. The driving arm 85 is mounted on the pump body 1 through a rotating shaft structure in cooperation with the shaft portion 85a. An elastic member is provided between the driving arm 85 and the pump body 1 to drive the driving arm 85 to swing toward the third transmission gear 84. A following wheel 851 is provided at the head end of the driving arm 85, and the following wheel 851 is meshed in the guide groove 84a and the yield groove 84b. A ratchet 852 is provided at the end of the driving arm 85. The ratchet 852 is provided at the end of the driving arm 85. The pawl 852 is swingably mounted at the end of the driving arm 85 and an elastic member is provided between the driving arm 85, the elastic member provides elastic force to make the ratchet 852 swing toward the third transmission gear 84, and there is a gap between the two ends of the driving arm 85 and the recessed clearance groove 84b close to it and the tooth groove of the synchronous indexing wheel 82 close to it, so that the driving arm 85 has the freedom to swing between the recessed clearance groove 84b and the synchronous indexing wheel 82, and the front end of the driving arm 85 cooperates with the guide groove 84a and the clearance groove 84b, and the rear end is aligned with the synchronous indexing wheel 82. The first end of the driving arm 85 cooperates with the guide groove 84a and the recessed clearance groove 84b to transmit part of the rotation of the third transmission gear 84 to the synchronous indexing wheel 82. Specifically, when the third transmission gear 84 rotates to move the recessed clearance groove 84b to the following wheel 851, the elastic member of the driving arm 85 pulls the following wheel 85 into the recessed clearance groove 84b, so that the driving arm 85 swings with the shaft 85a as the fulcrum, so that the end of the driving arm 85 is lifted from the synchronous indexing wheel 82, and then the elastic member of the ratchet 852 drives the ratchet 852 to rotate. The pawl 852 swings back and engages with the tooth groove on the proximal synchronous indexing wheel 82. Then, when the third transmission gear 84 rotates to move the follower wheel 851 from the recessed give way groove 84b to the guide groove 84a, the driving arm 85 is ejected to cause the pawl 852 to push the synchronous indexing wheel 82 to rotate forward a required distance, thereby causing the cavity surface ring 7 to perform intermittent motion without continuous rotation to generate unnecessary power consumption and instability. A person skilled in the art may optionally set limiting engaging teeth on the synchronous indexing wheel 82 to prevent it from reversing.

[0045] It should be noted that when the follower wheel 851 of the driving arm 85 is located in the recessed give way groove 84b, the connection point between its end and the pawl 852, the end of the pawl 852, and the center point of the synchronous indexing wheel 82 form a triangle, and it is an obtuse triangle. The obtuse tip of the obtuse triangle points in the direction in which the driving arm 85 swings after the follower wheel 851 moves from the recessed give way groove 84b to the guide groove 84a, thereby limiting the direction in which the pawl 852 pushes forward, thereby limiting the driving arm 85 from driving the pawl 852 to swing back, and the pawl 852 supports the synchronous indexing wheel 82 back, thereby preventing it from continuing to push.

[0046] On the basis of intermittent motion, the transmission is disconnected under certain working conditions: the clearance groove 84b can be movably protruded, and the inner part of the third transmission gear 84 forms a ring structure through the guide groove 84a and the protruding clearance groove 84b. The circular track cannot make the driving arm 85 swing, so that the synchronous indexing wheel 82 is fixed;

[0047] Specifically, the displacement groove 84b in the third transmission gear 84 is formed by a strip-shaped displacement strip 841. The displacement strip 841 is in a circular arc state of a circular ring structure as a basic state and is recessed toward the middle of the third transmission gear 84 as a deformation state. The guide groove 84a and the displacement groove 84b near the middle of the third transmission gear 84 have a cavity. The displacement strip 841 is provided with a counterweight 842 on the inner side of the cavity. The counterweight 842 is used to subject the displacement strip 841 located at the upper part after rotation to a downward pulling force. In order to stabilize the state of the counterweight 842 on the displacement strip 841, A tension spring 843 is connected between the weight block 842 and the inside of the cavity. The tension spring 843 provides a pulling force to drive the displacement bar 841 and the counterweight block 842 to move toward the middle of the third transmission gear 84. Therefore, when the third transmission gear 84 rotates at a low speed, the displacement bar 841 forms a concave clearance groove 84b under the cooperation of the counterweight block 842 and the tension spring 843, and then forms a cam structure with the clearance groove 84b; and when the third transmission gear 84 rotates at a high speed, the counterweight block 842 is thrown out, so that the displacement bar 841 and the counterweight block 842 form a whole bulge outward, and then form a circular ring structure with the guide groove 84a.

[0048] It should be noted that the tension of the tension spring 843 is greater than the sum of the gravity on the counterweight block 842 located below and the elastic force of the displacement bar 841 to pop out and return to its original position. Technical personnel in this field can set the tension of the tension spring 843 according to actual needs, so that the overall shape formed by the displacement bar 841 and the counterweight block 842 will not undergo significant deformation when stationary and in low-speed rotation. Since the contact position between the clearance groove 84b and the follower wheel 851 of the driving arm 85 is at the top, the setting of the tension of the tension spring 843 is mainly used to stabilize the counterweight block 842 that swings downward, and to ensure that the clearance groove 84b can be concave when needed.

[0049] In summary, in specific implementation, the first transmission gear 81 is installed in the matching step 1d through the shaft structure, and the end face of the matching step 1d at the bottom of the matching groove 1b is used as the assembly reference surface. The cavity surface ring 7 is shrunk and assembled into the matching groove 1b in the form of liquid nitrogen freezing, so that the tooth surface 7a of the cavity surface ring 7 is meshed with the transmission gear 81, and then the inner rotor 3, the outer rotor 4 and the pump cover 2 are installed, and the cavity surface ring 7 is matched with the three to form a pump cavity. The driving wheel 6 rotates to drive the inner rotor 3 to rotate through the main shaft 5, and the inner rotor 3 is meshed with the outer rotor 4 to drive the outer rotor 4 to rotate in the inner cavity 1a. The inner rotor 3 and the outer rotor 4 are eccentrically arranged so that when the inner rotor 3 drives the outer rotor 4 to rotate, the gap in the meshing area changes, that is, the change in the size of the pump cavity, so as to realize the pumping in and out of the oil at the two pump ports 2a, and the cavity surface ring 7 can be removed and replaced when it is worn due to cavitation, without replacing the entire pump body 1;

[0050] When the driving wheel 6 rotates, the second transmission gear 83 rotates through the coaxial connection, and the third transmission gear 84 rotates through meshing. As the engine power increases, the speed of the oil pump also increases accordingly, thereby increasing the oil flow rate. For example, when the overall speed of the oil pump is between 500r / min-4000r / min and the oil pump is at a low speed, such as 500r / min-1200r / min, the cooperation of the counterweight block 842 and the tension spring 843 allows the displacement strip 841 to form a concave give-way groove 84b. When the third transmission gear 84 rotates to move the concave give-way groove 84b to the following wheel 851, the elastic member of the driving arm 85 pulls the following wheel 85 into the concave give-way groove 84b, so that the driving arm 85 swings with the shaft portion 85a as the fulcrum, allowing the driving arm 85 The end is lifted from the synchronous indexing wheel 82, and then the elastic member of the ratchet 852 drives the ratchet 852 to swing back and engage with the tooth groove on the near side of the synchronous indexing wheel 82. Then, when the third transmission gear 84 rotates to move the following wheel 851 from the recessed give way groove 84b to the guide groove 84a, the driving arm 85 is pushed out to make the ratchet 852 push the synchronous indexing wheel 82 to rotate forward a required distance, so that the cavity surface ring 7 performs intermittent motion. When the speed is accelerated, such as 2000r / min-4000r / min, the counterweight block 842 is thrown out, so that the whole formed by the displacement strip 841 and the counterweight block 842 protrudes outward, and then forms a circular ring structure with the guide groove 84a. The circular ring-shaped trajectory cannot make the driving arm 85 swing, so that the synchronous indexing wheel 82 is fixed;

[0051] For the intermediate transition speed part, such as 1200r / min-2000r / min, the recessed give way groove 84b may bulge outwards. Those skilled in the art can make use of it according to the matching relationship between the pawl 852 and the synchronous indexing wheel 82. For example, the normally recessed give way groove 84b will make the pawl 852 move across 4 tooth grooves of the synchronous indexing wheel 82, and then the outward bulge will become 3, 2, etc., so that the give way groove 84b in the transition speed will bulge outwards. The pawl 852 still has a driving effect on the synchronous dividing wheel 82. Similarly, those skilled in the art can set the displacement bar 841 to support the direction after deformation, so that it can maintain the deformed state before reaching the required rotation speed. After reaching the required rotation speed, the displacement bar 841 quickly crosses the deformation dividing line and resets to a circular arc convex shape. This deformation dividing line is usually the connecting line at both ends of the displacement bar 841. Those skilled in the art can choose according to actual needs, which will not be elaborated here.

[0052] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A stable rotor type oil pump, comprising a pump body with an inner cavity and a pump cover provided at an open end of the inner cavity, wherein an inner rotor and an outer rotor are nested in the inner cavity and a driving wheel is provided outside the pump body, characterized in that: The pump body is provided with an outward through hole, the through hole is eccentrically arranged with the inner cavity, the driving wheel is provided with a main rotating shaft, and the main rotating shaft passes through the through hole and is connected with the inner rotor; The bottom of the inner cavity is a side opposite to the pump cover and is provided with a concave matching groove, the matching groove is concentrically arranged with the inner cavity, a cavity surface ring is installed in the matching groove, and the cavity surface ring cooperates with the inner rotor, the outer rotor and the pump cover to form a pump cavity; The bottom of the matching groove is provided with an assembly reference surface of the cavity surface ring, the inner and outer sides of the cavity surface ring located in the matching groove are clearance-matched with the inner and outer sides of the matching groove, the bottom of the inner cavity forms a center island on the inner side of the matching groove and the through hole is located in the center island; the pump cover is provided with two pump ports for liquid to enter and exit the pump cavity, the projection area of ​​the cavity surface ring on the pump cover is larger than the area of ​​the pump port and does not intersect with the area of ​​the pump port; The pump body is provided with a driving assembly connected with the cavity surface ring for enabling the cavity surface ring to change the position of the working surface of the pump cavity formed by it.

2. A stable rotor type oil pump according to claim 1, characterized in that: A toothed surface is provided on one side of the cavity surface ring close to the inner cavity, and the toothed surface is perpendicular to the back side of the cavity surface ring. The driving component includes a first transmission gear provided at the bottom of the matching groove through a rotating shaft structure, and the first transmission gear is meshed with the toothed surface to drive the cavity surface ring to rotate.

3. A stable rotor type oil pump according to claim 2, characterized in that: The back of the cavity surface ring has a layered convex structure and cooperates with the cavity surface ring to form a one-level step with two different thicknesses, and the tooth surface is arranged on the side of the step structure; A layered protruding matching step is extended from the bottom of the matching groove, and there is a spacing space between the matching step and the inner wall of one side of the matching groove. The layered protruding structure on the back of the cavity surface ring is embedded and engaged in the spacing space between the matching step and the inner wall of the matching groove, and the back of the cavity surface ring is located outside the spacing space and fits with the end face of the matching step; The first transmission gear is located in the matching step and meshes with the tooth surface in the spacing space.

4. A stable rotor type oil pump according to claim 3, characterized in that: The end surface of the matching step at the bottom of the matching groove is the assembly reference surface, or the inner end surface of the spacing space at the bottom of the matching groove and the end surface of the matching step at the bottom of the matching groove are both the assembly reference surfaces; The outer surface of the cavity surface ring is flush with or deeper than the bottom surface of the inner cavity in the matching groove, and the deep direction is the direction pointing to the bottom of the matching groove.

5. A stable rotor type oil pump according to claim 2, 3 or 4, characterized in that: The rotating shaft structure of the first transmission gear is provided with a wheel structure outside the pump body, and the wheel structure is in transmission cooperation with the main rotating shaft where the driving wheel is located; The driving assembly further comprises a second transmission gear, which is mounted on the main shaft and coaxially connected to the driving wheel, and the second transmission gear is located between the pump body and the driving wheel; The driving assembly also includes a third transmission gear, which is arranged on the pump cover at the side end of the second transmission gear and meshes with the second transmission gear. The wheel structure of the first transmission gear is transmitted and matched with the second transmission gear through the third transmission gear.

6. A stable rotor type oil pump according to claim 5, characterized in that: The wheel structure of the first transmission gear is a synchronous indexing wheel, and the synchronous indexing wheel is surrounded by a concave tooth groove; A circular guide groove is arranged around the inner side of the third transmission gear, and a recessed and movable protruding paving groove is arranged on the path of the guide groove, and the recessed direction of the recessed groove points to the direction of the axis of the third transmission gear and the protrusion can be moved in the opposite direction; The inner side portion of the third transmission gear forms a cam structure through the guide groove and the recessed clearance groove, or forms a ring structure through the guide groove and the raised clearance groove; A connecting rod type driving arm is provided between the synchronous indexing wheel and the third transmission gear, the head end of the driving arm cooperates with the guide groove and the give way groove and the tail end contacts with the synchronous indexing wheel, an elastic member is provided between the driving arm and the pump body for driving the driving arm to swing toward the third transmission gear, the head end of the driving arm cooperates with the guide groove and the recessed give way groove to transmit part of the rotation of the third transmission gear to the synchronous indexing wheel.

7. A stable rotor type oil pump according to claim 6, characterized in that: The middle part of the driving arm is provided with a shaft, and the driving arm is mounted on the pump body through a rotating shaft structure in cooperation with the shaft; the head end of the driving arm is provided with a follower wheel, and the follower wheel is engaged in the guide groove and the yield groove; the end of the driving arm is provided with a pawl, and the pawl is swingably mounted at the end of the driving arm and an elastic member is provided between the pawl and the driving arm, and the elastic member provides an elastic force to swing the pawl toward the direction of the third transmission gear; There are intervals between the two ends of the driving arm and the concave give-way groove and the tooth groove of the synchronous indexing wheel close to it, so that the driving arm has the freedom to swing between the concave give-way groove and the synchronous indexing wheel.

8. The stable rotor type oil pump according to claim 7, characterized in that: When the follower wheel of the driving arm is located in the recessed give way groove, the connection point between its end and the pawl, the end of the pawl, and the center point of the synchronous dividing wheel form a triangle, which is an obtuse triangle. The obtuse angle tip of the obtuse triangle points in the direction in which the driving arm swings after the follower wheel moves from the recessed give way groove to the guide groove.

9. The stable rotor type oil pump according to claim 7, characterized in that: The clearance groove in the third transmission gear is formed by a strip-shaped displacement strip, the guide groove and the clearance groove have a cavity near the middle of the third transmission gear, and the displacement strip is provided with a counterweight block inside the cavity; A tension spring is connected between the counterweight block and the interior of the cavity, and the tension spring provides a pulling force to drive the displacement bar and the counterweight block to move toward the middle of the third transmission gear; The displacement strip forms a concave displacement groove under the cooperation of the counterweight block and the tension spring, and further forms a cam structure with the guide groove; The displacement bar starts to protrude outwards when the third transmission gear rotates until the displacement bar and the counterweight block form a whole, and then forms a circular ring structure with the guide groove.

10. The stable rotor type oil pump according to claim 9, characterized in that: The displacement strip is made of metal, and takes the arc state of the circular ring structure as the basic state and is concave toward the middle of the third transmission gear as the deformation state.

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