High-pressure oil pump executing mechanism and high-pressure oil pump

Abstract

The invention provides a high-pressure oil pump executing mechanism and a high-pressure oil pump, and belongs to the technical field of oil pumps. The pump cover is connected with the pump body, and the pump cover is provided with a second high-pressure cavity; the rotor assembly is located between the pump body and the pump cover and divides the first high-pressure cavity and the second high-pressure cavity, the rotor assembly comprises an inner rotor and an outer rotor, the inner rotor and the outer rotor are rotationally connected with the pump body and are eccentric, the inner rotor is provided with a first balance hole, and the outer rotor is provided with a second balance hole. And when the inner rotor rotates to a specified position, the first high-pressure cavity and the second high-pressure cavity are communicated through the first balance hole. According to the invention, the pressure difference between the pump body and the high-pressure area of the pump cover is effectively reduced, and the axial unbalanced force acting on the rotor assembly is obviously reduced; and dry friction between the gear and the pump cover / pump body is relieved, so that abrasion is greatly reduced, and the service life is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of oil pump technology, and relates to a high-pressure oil pump actuator and a high-pressure oil pump. Background Technology

[0002] In existing high-pressure oil pumps, the pump body and pump cover are usually used to form a closed working chamber, in which the inner and outer rotors are eccentrically set to realize the intake and discharge of oil. When the oil pump is under high pressure, there is often a significant pressure difference between the high-pressure areas on the pump body side and the pump cover side. Since the pump body and pump cover are separate structures and the high-pressure chambers between them are isolated from each other, this pressure difference will directly act on both ends of the rotor assembly, generating a large net axial force.

[0003] This axial force forces the rotor end face to continuously press against the mating end face of the pump cover or pump body. In the absence of an effective pressure equalization mechanism, this not only leads to excessive local stress on the sealing surface, but also makes it difficult to maintain a stable lubrication state between the rotor and the end face. Under long-term operation, the end face wear intensifies, the gap increases, and this leads to increased internal leakage and decreased volumetric efficiency. In severe cases, it can even cause jamming or failure, significantly shortening the service life of the oil pump.

[0004] Current common solutions mostly rely on external pressure relief valves or fixed throttling orifices, but such structures cannot dynamically respond to pressure changes as the rotor rotates, making it difficult to achieve accurate and timely axial force balance, and there is considerable room for improvement. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a high-pressure oil pump actuator and a high-pressure oil pump.

[0006] The objective of this invention can be achieved through the following technical solution: a high-pressure oil pump actuator, comprising: The pump body is provided with a first high-pressure chamber; A pump cover, which is connected to the pump body, and the pump cover is provided with a second high-pressure chamber; A rotor assembly is located between the pump body and the pump cover and separates the first high-pressure chamber and the second high-pressure chamber. The rotor assembly includes an inner rotor and an outer rotor. Both the inner rotor and the outer rotor are rotatably connected to the pump body and are eccentric to each other. The inner rotor is provided with a first balance hole. When the inner rotor rotates to a designated position, the first high-pressure chamber and the second high-pressure chamber are connected through the first balance hole.

[0007] In the aforementioned high-pressure oil pump actuator, a first high-pressure groove is provided on the side of the first high-pressure chamber, and a second high-pressure groove is provided on the side of the second high-pressure chamber. When the inner rotor rotates to a designated position, the first high-pressure groove and the second high-pressure groove are connected through the first balance hole.

[0008] In the aforementioned high-pressure oil pump actuator, the pump cover is further provided with a balance groove, which is an annular groove and distributed around the circumference of the inner rotor.

[0009] In the aforementioned high-pressure oil pump actuator, the pump body is further provided with a first rotor cavity and a low-pressure groove. At least a portion of the inner rotor is located in the first rotor cavity, and the low-pressure groove is connected to the first rotor cavity. The inner rotor is also provided with a second balance hole. When the inner rotor rotates to a designated position, the balance groove and the low-pressure groove are connected through the second balance hole.

[0010] In the aforementioned high-pressure oil pump actuator, the pump cover is further provided with a second rotor cavity, at least a portion of the inner rotor is located in the second rotor cavity, and the inner rotor separates the first rotor cavity from the second rotor cavity.

[0011] In the aforementioned high-pressure oil pump actuator, the inner rotor is further provided with a third balance hole, the two ends of which are respectively connected to the first rotor cavity and the second rotor cavity.

[0012] In the aforementioned high-pressure oil pump actuator, the inner rotor is provided with an axial channel, which is distributed along the axial direction of the inner rotor, and the two ends of the axial channel are respectively connected to the first rotor cavity and the second rotor cavity.

[0013] In the aforementioned high-pressure oil pump actuator, the pump body is further provided with a first low-pressure chamber, the pump cover is further provided with a second low-pressure chamber, and the rotor assembly separates the first low-pressure chamber and the second low-pressure chamber.

[0014] In the aforementioned high-pressure oil pump actuator, the pump body is further provided with a first connecting channel, and the pump cover is further provided with a second connecting channel. The first connecting channel is connected to the first low-pressure chamber, and the second connecting channel is connected to the second low-pressure chamber. The first connecting channel is also connected to the second connecting channel.

[0015] Secondly, a high-pressure oil pump, including the aforementioned high-pressure oil pump actuator.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting a first balance hole on the inner rotor (gear) and connecting the first high-pressure chamber of the pump body and the second high-pressure chamber of the pump cover when it rotates to a designated position, the pressure difference between the high-pressure areas of the pump body and the pump cover is effectively reduced, significantly reducing the axial unbalanced force acting on the rotor assembly; at the same time, the balance hole, as a key node of the lubrication circuit, guides high-pressure oil to participate in the formation of the end face oil film, alleviating the dry friction between the gear and the pump cover / pump body, thereby greatly reducing wear and extending service life; a first high-pressure groove and a second high-pressure groove are respectively set on the sides of the first high-pressure chamber and the second high-pressure chamber, and periodically connected through the first balance hole, which not only further evens out the pressure difference, but also provides a more balanced and efficient lubrication system. The design balances the pressure in the high-pressure areas on both sides of the pump body and pump cover, and provides a stable flow path for high-pressure oil. This structure allows high-pressure oil to continuously flow through the gear end face and the mating surface of the pump cover / pump body, forming a dynamic load-bearing oil film, effectively preventing direct metal-to-metal contact and significantly improving wear resistance and operational stability. An annular balance groove distributed around the inner rotor is provided on the pump cover, working in conjunction with the balance holes on the gears to form a continuous pressure buffer and lubrication distribution channel. This annular groove can evenly collect the high-pressure oil flowing out through the balance holes and distribute it throughout the entire end face area, ensuring that the contact surface between the pump cover and the gear is always fully lubricated, greatly improving end face wear problems, and is especially suitable for high-load, long-cycle operation conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the high-pressure oil pump actuator of the present invention; Figure 2 This is an exploded view of the high-pressure oil pump actuator of the present invention; Figure 3 This is an exploded view of the high-pressure oil pump actuator of the present invention from another perspective. Figure 4 This is a schematic diagram of the pump body of the present invention; Figure 5 This is a top view of the high-pressure oil pump actuator of the present invention; Figure 6 for Figure 5 A cross-sectional view from the perspective of AA.

[0018] In the figure, 100 is the pump body; 110 is the first high-pressure chamber; 111 is the first high-pressure groove; 120 is the first rotor chamber; 130 is the low-pressure groove; 140 is the first low-pressure chamber; 150 is the first connecting channel; 200 is the pump cover; 210 is the second high-pressure chamber; 211 is the second high-pressure groove; 220 is the balance groove; 230 is the second rotor chamber; 240 is the second low-pressure chamber; 250 is the second connecting channel; 300 is the rotor assembly; 310 is the inner rotor; 311 is the first balance hole; 312 is the second balance hole; 313 is the third balance hole; 314 is the axial channel; and 320 is the outer rotor. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0021] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0024] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0025] like Figures 1-6 As shown, a high-pressure oil pump actuator includes: a pump body 100, a pump cover 200, and a rotor assembly 300.

[0026] The pump body 100 is provided with a first high-pressure chamber 110.

[0027] The pump cover 200 is connected to the pump body 100, and the pump cover 200 is provided with a second high-pressure chamber 210.

[0028] The rotor assembly 300 is located between the pump body 100 and the pump cover 200, separating the first high-pressure chamber 110 and the second high-pressure chamber 210. The rotor assembly 300 includes an inner rotor 310 and an outer rotor 320. Both the inner rotor 310 and the outer rotor 320 are rotatably connected to the pump body 100 and are eccentric to each other. The inner rotor 310 is provided with a first balance hole 311. When the inner rotor 310 rotates to a designated position, the first high-pressure chamber 110 and the second high-pressure chamber 210 are connected through the first balance hole 311.

[0029] In this embodiment, by providing a first balance hole 311 on the inner rotor 310 (gear) and connecting the first high-pressure chamber 110 of the pump body 100 and the second high-pressure chamber 210 of the pump cover 200 when it rotates to a designated position, the pressure difference between the high-pressure areas of the pump body 100 and the pump cover 200 is effectively reduced, and the axial unbalanced force acting on the rotor assembly 300 is significantly reduced. At the same time, as a key node of the lubrication circuit, the balance hole guides high-pressure oil to participate in the formation of the end face oil film, alleviating the dry friction between the gear and the pump cover 200 / pump body 100, thereby greatly reducing wear and extending service life.

[0030] like Figures 1-6 As shown, based on the above embodiment, the first high-pressure chamber 110 is provided with a first high-pressure groove 111 on its side, and the second high-pressure chamber 210 is provided with a second high-pressure groove 211 on its side. When the inner rotor 310 rotates to a designated position, the first high-pressure groove 111 and the second high-pressure groove 211 are connected through the first balance hole 311.

[0031] In this embodiment, a first high-pressure groove 111 and a second high-pressure groove 211 are respectively provided on the sides of the first high-pressure chamber 110 and the second high-pressure chamber 210, and are periodically connected through the first balance hole 311. This not only further balances the pressure of the high-pressure areas on both sides of the pump body 100 and the pump cover 200, but also provides a stable flow path for the high-pressure oil. This structure allows the high-pressure oil to continuously flow through the gear end face and the mating surface of the pump cover 200 / pump body 100, forming a dynamic bearing oil film, effectively preventing direct metal contact, and significantly improving wear resistance and operational stability.

[0032] like Figures 1-6 As shown, based on the above embodiment, the pump cover 200 is also provided with a balance groove 220, which is an annular groove and distributed around the circumference of the inner rotor 310.

[0033] In this embodiment, an annular balance groove 220 is provided on the pump cover 200, which is distributed around the inner rotor 310. It works in conjunction with the balance hole on the gear to form a continuous pressure buffer and lubrication distribution channel. The annular groove can evenly collect the high-pressure oil flowing out of the balance hole and distribute it to the entire end face area, ensuring that the contact surface between the pump cover 200 and the gear is always in a fully lubricated state, which greatly improves the end face wear problem and is especially suitable for high load and long cycle operation conditions.

[0034] like Figures 1-6 As shown, based on the above embodiment, the pump body 100 is further provided with a first rotor cavity 120 and a low-pressure groove 130. At least a portion of the inner rotor 310 is located in the first rotor cavity 120. The low-pressure groove 130 is connected to the first rotor cavity 120. The inner rotor 310 is also provided with a second balance hole 312. When the inner rotor 310 rotates to a designated position, the balance groove 220 and the low-pressure groove 130 are connected through the second balance hole 312.

[0035] In this embodiment, by adding a second balance hole 312 to the inner rotor 310 and connecting the annular balance groove 220 of the pump cover 200 and the low-pressure groove 130 of the pump body 100 in a specific phase, a complete lubrication circuit is constructed from the high-pressure zone → balance hole → annular groove → second balance hole 312 → low-pressure groove 130. This circuit not only achieves pressure balance between the high and low pressure zones, but also ensures that a large amount of lubricating oil continuously flows through the sliding pair surfaces of the gear and the pump body 100 / pump cover 200, forming a stable oil film; at the same time, the lubricating oil eventually flows into the low-pressure groove 130 and supplies the sliding bearing, realizing the self-lubrication of the bearing and doubly reducing the wear of the key friction pairs.

[0036] like Figures 1-6 As shown, based on the above embodiment, the pump cover 200 is further provided with a second rotor cavity 230, at least a portion of the inner rotor 310 is located in the second rotor cavity 230, and the inner rotor 310 separates the first rotor cavity 120 and the second rotor cavity 230.

[0037] In this embodiment, the pump body 100 is divided into a first rotor chamber 120 and a second rotor chamber 230, separated by an inner rotor 310, providing a structural basis for constructing a multi-path pressure balance and lubrication circulation. This dual-chamber layout allows high-pressure oil to flow to the end face of the pump cover 200 and the end face of the pump body 100 through different balance holes, achieving more comprehensive axial force cancellation and end face lubrication coverage, avoiding local overheating or uneven wear, and improving overall reliability.

[0038] like Figures 1-6As shown, based on the above embodiment, the inner rotor 310 is also provided with a third balance hole 313, the two ends of which are respectively connected to the first rotor cavity 120 and the second rotor cavity 230.

[0039] In this embodiment, a third balancing hole 313 is provided on the inner rotor 310, directly connecting the first rotor cavity 120 and the second rotor cavity 230. This allows for pressure equalization between the two working chambers, further reducing the internal pressure difference caused by eccentric meshing. This structure not only reduces internal leakage losses and improves volumetric efficiency, but also guides the flow of lubricating oil between the two chambers, assisting in cooling and lubricating the rotor sides and reducing the risk of radial wear.

[0040] like Figures 1-6 As shown, based on the above embodiment, the inner rotor 310 is provided with an axial channel 314, which is distributed along the axial direction of the inner rotor 310. The two ends of the axial channel 314 are respectively connected to the first rotor cavity 120 and the second rotor cavity 230.

[0041] In this embodiment, an axial channel 314 is provided inside the inner rotor 310, connecting the first rotor cavity 120 and the second rotor cavity 230. Compared with the micro balance hole, it has a larger flow cross section, which can efficiently transmit pressure and deliver sufficient lubricating oil. This channel ensures that even under high viscosity oil or low temperature start-up conditions, it can still maintain good intercavity pressure balance and lubrication supply, significantly improving the adaptability and durability of the oil pump under harsh working conditions.

[0042] like Figures 1-6 As shown, based on the above embodiment, the pump body 100 is further provided with a first low-pressure chamber 140, the pump cover 200 is further provided with a second low-pressure chamber 240, and the rotor assembly 300 separates the first low-pressure chamber 140 and the second low-pressure chamber 240.

[0043] In this embodiment, a first low-pressure chamber 140 and a second low-pressure chamber 240 are respectively provided in the pump body 100 and the pump cover 200, and are separated by the rotor assembly 300 to form a symmetrical low-pressure zone. This structure helps to balance the back pressure on both sides of the rotor and reduce the net axial force; at the same time, the low-pressure chamber, as the end point of the lubrication circuit, collects the return oil after end face lubrication, providing a stable oil source for subsequent flow to the sliding bearing, ensuring the long-term reliable operation of the bearing.

[0044] like Figures 1-6As shown, based on the above embodiment, the pump body 100 is further provided with a first connecting channel 150, and the pump cover 200 is further provided with a second connecting channel 250. The first connecting channel 150 is connected to the first low-pressure chamber 140, and the second connecting channel 250 is connected to the second low-pressure chamber 240. The first connecting channel 150 is connected to the second connecting channel 250.

[0045] In this embodiment, by setting up a first connecting channel 150 and a second connecting channel 250 that are interconnected, the low-pressure chambers of the pump body 100 and the pump cover 200 are connected to ensure that the pressure of the entire low-pressure circuit is consistent. This design not only optimizes the oil suction performance, but more importantly, it provides a smooth outlet path for the lubrication circuit. The oil after end face lubrication can smoothly flow into the low-pressure chamber and be centrally supplied to the sliding bearing through the channel, realizing the integration of "end face lubrication + bearing lubrication" and comprehensively reducing system wear.

[0046] like Figures 1-6 A high-pressure oil pump, including the aforementioned high-pressure oil pump actuator.

[0047] In this embodiment, the high-pressure oil pump actuator integrating pressure balancing, end face lubrication, and bearing oil supply is applied to the high-pressure oil pump of the whole machine, which fundamentally solves the problem of axial force imbalance caused by excessive pressure difference in the high-pressure area in the traditional structure. The closed-loop lubrication circuit constructed by the gear balance hole and the oil groove of the pump body 100 / pump cover 200 ensures that the gear end face, pump cover 200, pump body 100 and sliding bearing are all adequately lubricated.

[0048] This oil pump not only operates smoothly, with low noise and high efficiency, but also has minimal wear on key friction pairs, significantly extending its service life. It is particularly suitable for applications such as new energy vehicles and construction machinery, where the reliability and durability of high-pressure oil pumps are extremely important.

Claims

1. A high-pressure oil pump actuator, characterized in that, include: The pump body is provided with a first high-pressure chamber; A pump cover, which is connected to the pump body, and the pump cover is provided with a second high-pressure chamber; A rotor assembly is located between the pump body and the pump cover and separates the first high-pressure chamber and the second high-pressure chamber. The rotor assembly includes an inner rotor and an outer rotor. Both the inner rotor and the outer rotor are rotatably connected to the pump body and are eccentric to each other. The inner rotor is provided with a first balance hole. When the inner rotor rotates to a designated position, the first high-pressure chamber and the second high-pressure chamber are connected through the first balance hole.

2. The high-pressure oil pump actuator as described in claim 1, characterized in that: The first high-pressure chamber has a first high-pressure groove on its side, and the second high-pressure chamber has a second high-pressure groove on its side. When the inner rotor rotates to a designated position, the first high-pressure groove and the second high-pressure groove are connected through the first balance hole.

3. The high-pressure oil pump actuator as described in claim 2, characterized in that: The pump cover is also provided with a balancing groove, which is an annular groove and distributed around the circumference of the inner rotor.

4. The high-pressure oil pump actuator as described in claim 3, characterized in that: The pump body is also provided with a first rotor cavity and a low-pressure groove. At least a part of the inner rotor is located in the first rotor cavity. The low-pressure groove is connected to the first rotor cavity. The inner rotor is also provided with a second balance hole. When the inner rotor rotates to a designated position, the balance groove and the low-pressure groove are connected through the second balance hole.

5. The high-pressure oil pump actuator as described in claim 4, characterized in that: The pump cover is also provided with a second rotor cavity, at least a portion of the inner rotor is located in the second rotor cavity, and the inner rotor separates the first rotor cavity from the second rotor cavity.

6. The high-pressure oil pump actuator as described in claim 5, characterized in that: The inner rotor is also provided with a third balancing hole, the two ends of which are respectively connected to the first rotor cavity and the second rotor cavity.

7. The high-pressure oil pump actuator as described in claim 5, characterized in that: The inner rotor is provided with an axial channel, which is distributed along the axial direction of the inner rotor, and the two ends of the axial channel are respectively connected to the first rotor cavity and the second rotor cavity.

8. The high-pressure oil pump actuator as described in claim 1, characterized in that: The pump body is further provided with a first low-pressure chamber, the pump cover is further provided with a second low-pressure chamber, and the rotor assembly separates the first low-pressure chamber and the second low-pressure chamber.

9. The high-pressure oil pump actuator as described in claim 8, characterized in that: The pump body is also provided with a first connecting channel, and the pump cover is also provided with a second connecting channel. The first connecting channel is connected to the first low-pressure chamber, the second connecting channel is connected to the second low-pressure chamber, and the first connecting channel is connected to the second connecting channel.

10. A high-pressure oil pump, characterized in that, include: A high-pressure oil pump actuator as described in any one of claims 1-9.

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