A bidirectional meshing gear and an oil pump containing the bidirectional meshing gear

Abstract

This invention provides a bidirectional meshing gear, comprising two identical gear assemblies that mesh with each other. Each gear assembly includes an internal gear and an external gear. The outer circumferential surface of the internal gear has internal meshing teeth, and the external gear is located outside the internal gear. The inner circumferential surface of the external gear is machined with an internal meshing profile that meshes with the internal meshing teeth, and the outer circumferential surface of the external gear is machined with external meshing teeth. A lubricating oil pump is also provided, comprising a pump housing, within which are a distributor plate, a drive shaft, a driven shaft, and a bidirectional meshing gear. One gear assembly of the bidirectional meshing gear is mounted on the drive shaft, and the other gear assembly of the bidirectional meshing gear is mounted on the driven shaft. The two gear assemblies are located on the same side of the distributor plate and mesh with each other. The lubricating oil pump containing the bidirectional meshing gear can achieve the design goals of large displacement, high efficiency, and light weight, resulting in superior pump layout, performance, and efficiency, and improving the adaptability of the pump application.

Description

Technical Field

[0001] This invention belongs to the field of engines and relates to engine oil pump design technology, specifically a bidirectional meshing gear and an oil pump containing the bidirectional meshing gear. Background Technology

[0002] Currently, with the increasing demand for large-displacement oil pumps, traditional oil pump designs typically increase displacement by raising the pump's speed and increasing tooth thickness. However, this results in a linear increase in the pump's weight and a decrease in its efficiency, which is detrimental to maintaining pump efficiency. Furthermore, the increased pump weight directly leads to a decline in engine performance indicators. Summary of the Invention

[0003] The purpose of this invention is to provide a bidirectional meshing gear and an oil pump containing the bidirectional meshing gear. The bidirectional meshing gear can achieve the design goals of large displacement, high efficiency and light weight of the oil pump, and solve the problems of simple structure, displacement increasing with weight and low efficiency of traditional oil pumps. It makes the layout, performance and efficiency of the oil pump more superior and improves the adaptability of the oil pump to the engine.

[0004] The technical solution to achieve the purpose of the invention is as follows:

[0005] In a first aspect, the present invention provides a bidirectional meshing gear, comprising two gear assemblies with identical structures that mesh with each other;

[0006] The gear assembly includes an internal gear, the center of which is provided with a shaft mounting hole, and the outer circumferential surface of the internal gear is provided with internal meshing teeth;

[0007] An external gear is provided outside the internal gear. The inner circumferential surface of the external gear is machined with an internal meshing profile that meshes with the internal meshing teeth, and the outer circumferential surface of the external gear is machined with external meshing teeth.

[0008] Furthermore, the internal gear is machined with a weight-reducing groove.

[0009] Furthermore, the internal meshing profile is a cycloidal profile, and the eccentricity of the external gear relative to the internal gear is 1 to 6 mm.

[0010] In a second aspect, the present invention provides a lubricating oil pump, including a lubricating oil pump housing, wherein the lubricating oil pump housing is provided with an oil distribution plate, a drive shaft, a driven shaft, and the bidirectional meshing gear described in the first aspect;

[0011] The drive shaft is provided with one gear assembly of the bidirectional meshing gear, and the driven shaft is provided with another gear assembly of the bidirectional meshing gear, and the two gear assemblies are located on the same side of the oil distributor and mesh with each other.

[0012] Furthermore, the oil distribution plate includes a front support oil distribution plate, an interstage oil distribution plate, and a rear support oil distribution plate along the direction from the oil inlet to the oil outlet.

[0013] Furthermore, there is at least one interstage oil distribution plate, which is provided with mirror-symmetrical and connected drive shaft mounting holes and driven wheel mounting holes, and the interstage oil distribution plate is also provided with an isolation and sealing structure for oil inlet and outlet.

[0014] Furthermore, the isolation sealing structure includes a first sealing structure located outside the drive shaft mounting hole, a second sealing structure located outside the driven wheel mounting hole and mirror-symmetrical to the first sealing structure, and a third sealing structure located between the drive shaft mounting hole and the driven wheel mounting hole;

[0015] Both the first sealing structure and the second sealing structure include an external meshing sealing structure and an internal meshing sealing structure. The outer side of the external meshing sealing structure contacts the inner wall of the lubricating pump housing, and the inner side of the external meshing sealing structure is in clearance fit with the tooth surface of the external gear of the gear assembly. The internal meshing sealing structure is in clearance fit with the tooth surface between the internal meshing teeth and the internal meshing profile.

[0016] The third sealing structure is fitted with the tooth surface clearance between the two external gears of the bidirectional meshing gear.

[0017] Furthermore, a retaining ring is provided on the drive shaft.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The lubricating oil pump designed in this invention breaks away from the traditional lubricating oil structure and successfully solves the problems of low unit flow rate, heavy weight and low efficiency under large displacement. It is of great significance to the design of lubricating oil pumps, and has the following advantages compared with the previous internal meshing lubricating oil pumps:

[0019] 1. The innovative design adopts a two-way meshing gear, which has one external meshing and two internal meshing gears. This is a brand-new compact lubricating pump structure that greatly improves the oil suction capacity of the single-stage lubricating pump and reduces its own weight while increasing the displacement.

[0020] 2. The bidirectional meshing gear structure integrates the functions of oil supply and power transmission of the internal meshing gear pump, greatly reducing the complexity of the transmission structure.

[0021] 3. The design of the interstage oil distribution plate integrates both radial and end face oil inlet methods, and simultaneously achieves the sealing and isolation function of internal meshing oil inlet and outlet and external meshing oil inlet and outlet of the bidirectional meshing gears.

[0022] 4. The topology of the inner rotor was optimized, which reduced the weight of the rotor and reduced mechanical friction at the end face.

[0023] 5. By setting the number of meshing teeth between the two external gears to be different from the number of meshing teeth between the external and internal gears, different rotational speeds of the driving and driven shafts can be achieved simultaneously, providing a variety of options for the design and matching of the lubricating pump. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are merely for the purpose of more clearly illustrating the technical solutions in the embodiments of the present invention or the prior art. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0025] Figure 1 This is a schematic diagram of the bidirectional meshing gear in Example 1;

[0026] Figure 2 This is a schematic diagram of the external gear of the bidirectional meshing gear in Example 1;

[0027] Figure 3 This is a schematic diagram of the internal gear of the bidirectional meshing gear in Example 1;

[0028] Figure 4 This is a schematic diagram of the lubricating oil pump in Example 2;

[0029] Figure 5 This is a cross-section of the lubricating oil pump in Example 2, along with schematic diagrams of the oil inlet and outlet.

[0030] Figure 6 This is a schematic diagram of the interstage oil separator in Example 2;

[0031] Figure 7 This is a schematic diagram of the assembly of the interstage oil distribution plate and the bidirectional meshing gear in Example 2;

[0032] Among them, 100. Internal gear; 101. Shaft mounting hole; 102. Internal meshing gear; 200. External gear; 210. Internal meshing profile; 220. External meshing gear; 300. Weight reduction groove; 1. Retaining ring; 2. Oil pump housing; 201. Oil inlet; 202. Oil outlet; 3. Driven shaft; 4. Sliding bearing; 5. Front support oil distribution plate; 6. Gear assembly; 8. Interstage oil distribution plate; 801. External meshing sealing structure; 802. Drive shaft mounting hole; 803. Driven shaft mounting hole; 804. Internal meshing sealing structure; 805. Third sealing structure; 10. Rear support oil distribution plate; 11. Self-locking nut; 17. Drive shaft. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solutions of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0034] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0035] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0036] Example 1:

[0037] This embodiment provides a bidirectional meshing gear; please refer to... Figures 1 to 3 As shown, the bidirectional meshing gear consists of two identical gear assemblies that mesh with each other.

[0038] like Figure 1 and Figure 3 As shown, the gear assembly includes an internal gear 100, the center of which is provided with a shaft mounting hole 101, and the outer peripheral surface of the internal gear 100 is provided with internal meshing teeth 102.

[0039] like Figure 1 and Figure 2 As shown, an external gear 200 is provided on the outside of the internal gear 100. The inner circumferential surface of the external gear 200 is machined with an internal meshing profile 210 that meshes with the internal meshing teeth 102, and the outer circumferential surface of the external gear 100 is machined with external meshing teeth 220.

[0040] In some alternative embodiments, such as Figure 3 As shown, the internal gear 100 is machined with a weight-reducing groove 300.

[0041] In some alternative embodiments, the internal meshing profile 210 is a cycloidal profile, and the eccentricity of the external gear 200 relative to the internal gear 100 is 1 to 6 mm.

[0042] In some alternative embodiments, the external gear 200 has 10 to 60 teeth, a module of 0.5 to 5, a tooth width of 2 to 30 mm, and a pressure angle of 5 to 35 degrees. The internal gear 100 has 2 to 10 teeth, and the rotor thickness is 1 to 50 mm.

[0043] In this embodiment, the bidirectional meshing gear can have one gear assembly mounted on the drive shaft and the other gear assembly mounted on the driven shaft. The bidirectional meshing gear operates as follows: rotation of the drive shaft drives the internal gear 100 mounted thereon to rotate, which in turn drives the external gear 200 meshing with it to rotate. Simultaneously, the external gear 200 drives the external gear 200 of another gear assembly meshing with it to rotate, which in turn drives the internal gear 100 meshing within it. This internal gear 100 then drives the driven shaft to rotate, thus completing the power transmission from the drive shaft to the driven gear.

[0044] Example 2:

[0045] This embodiment provides a lubricating oil pump, such as Figure 4 As shown, the lubricating oil pump includes a lubricating oil pump housing 2, which contains an oil distribution plate, a drive shaft 17, a driven shaft 3, and the bidirectional meshing gear described in Embodiment 1.

[0046] The main function of the oil pump housing 2 is to support the installation of the overall components and to provide interfaces for oil inlet and outlet, such as... Figure 5 As shown, the oil pump housing 2 has an oil inlet 201 at one end and an oil outlet 202 at the other end.

[0047] In this embodiment, as Figure 4 As shown, the oil distribution plate includes a front support oil distribution plate 5, an interstage oil distribution plate 8, and a rear support oil distribution plate 10 along the direction from the oil inlet to the oil outlet.

[0048] In some alternative embodiments, such as Figure 6 and Figure 7 As shown, the interstage oil distribution plate 8 is provided with a mirror-symmetrical drive shaft mounting hole 802 and a driven wheel mounting hole 803 connected together, and the interstage oil distribution plate 8 is also provided with an oil inlet and oil outlet isolation sealing structure, which isolates and seals the oil inlet 201 and the oil outlet 202.

[0049] In some alternative embodiments, such as Figure 6 and Figure 7As shown, the isolation sealing structure includes a first sealing structure located outside the drive shaft mounting hole 802, a second sealing structure located outside the driven wheel mounting hole 803 and mirror-symmetrical to the first sealing structure, and a third sealing structure 805 located between the drive shaft mounting hole 802 and the driven wheel mounting hole 803.

[0050] The first sealing structure and the second sealing structure each include an external meshing sealing structure 801 and an internal meshing sealing structure 804. The outer side of the external meshing sealing structure 801 contacts the inner wall of the oil pump housing 2, and the inner side of the external meshing sealing structure 801 is in clearance fit with the tooth surface of the external gear of the gear assembly 6. The internal meshing sealing structure 804 is in clearance fit with the tooth surface of the internal meshing tooth 102 and the internal meshing profile 210.

[0051] In some optional embodiments, the external meshing seal structure 801 has an arc-shaped surface. The outer surface of the external meshing seal structure 801 contacts the inner wall of the oil pump housing 2, and the inner surface of the external meshing seal structure 801 is in clearance fit with the tooth surface of the external gear of the gear assembly 6. The external meshing seal structure 801 provides flow diversion and sealing for the oil pump, provides oil suction and discharge space, and simultaneously seals and isolates the oil inlet 201 and the oil outlet 202.

[0052] In some optional embodiments, the internal meshing seal structure 804 is positioned near the drive shaft mounting hole 802 and the driven wheel mounting hole 803, and the internal meshing seal structure 804 is in clearance fit with the tooth surface between the internal meshing teeth 102 and the internal meshing profile 210. Simultaneously, the shape and position of the internal meshing seal structure 804 can be set according to the size of the meshing space formed between the internal meshing teeth 102 and the internal meshing profile 210, and the internal meshing seal structure 804 should be larger than the tooth surface clearance to ensure that the internal meshing seal structure 804 covers the tooth surface clearance, thus separating the two internal meshing oil inlets and outlets of the bidirectional gear.

[0053] In some optional embodiments, the third sealing structure 805 is fitted with the tooth surface clearance of the two external gears 200 of the bidirectional meshing gear. The shape and size of the third sealing structure 805 need to be determined according to the size and shape of the tooth surface clearance formed between the two external gears 200. At the same time, the third sealing structure 805 needs to be slightly larger than the size of the tooth surface clearance to ensure that the working surface is fitted with the end faces of the two externally meshing external gears 200 respectively during operation, so as to separate the external meshing oil inlet and oil outlet of the bidirectional gear.

[0054] In some optional embodiments, there is at least one interstage oil distribution plate 8, and the bidirectional meshing gear is provided between adjacent interstage oil distribution plates 8, between the interstage oil distribution plate 8 and the front support oil distribution plate 5, and between the interstage oil distribution plate 8 and the rear support oil distribution plate 10.

[0055] In this embodiment, as Figure 4 , Figure 5 , Figure 6 As shown, the drive shaft 17 is provided with one gear assembly 6 of the bidirectional meshing gear, and the driven shaft 3 is provided with another gear assembly 6 of the bidirectional meshing gear. The two gear assemblies 6 are located on the same side of the oil distributor and mesh with each other.

[0056] In this embodiment, an oil inlet and outlet chamber is formed between the inner gear 100 and the outer gear 200 of one gear assembly 6, and an oil inlet and outlet chamber is formed between the outer gear 200 of one gear assembly 6 and the outer gear 200 of another gear assembly. At this time, a bidirectional meshing gear can form three oil inlet and outlet chambers.

[0057] In some alternative embodiments, such as Figure 4 As shown, the drive shaft 17 is provided with a retaining ring 1, which can axially limit the drive shaft 17.

[0058] In some alternative embodiments, such as Figure 4 As shown, both the drive shaft 17 and the driven shaft 3 are provided with sliding bearings 4, which provide support for the drive shaft 17 and the driven shaft 3.

[0059] In this embodiment, the drive shaft 17 obtains external rotational power through a spline connection. The drive shaft 17 drives the inner gear 100 of the bidirectional meshing gear on it to rotate, and the inner gear 100 drives the outer gear 200 to rotate, which in turn drives another bidirectional meshing gear meshing with it to rotate, thus completing the power transmission from the drive shaft 17 to the driven shaft 3.

[0060] In some alternative embodiments, such as Figure 4 As shown, the lubricating oil pump housing 2 is connected to the rear support oil distribution plate 10 via a self-locking nut 11.

[0061] In this embodiment, the working principle of the lubricating oil pump is as follows: Figure 4 and Figure 5 As shown, when the lubricating oil pump is working, the lubricating oil pump housing 2 provides the oil inlet 201, oil outlet 202, and oil well structure of the lubricating oil pump. When the lubricating oil enters the oil well from the oil inlet 201, the lubricating oil sucked in through the front support distribution plate 5, the interstage distribution plate 8, and the rear support distribution plate 10 will be divided into six parts, of which the first stage pump is divided into 3 parts and the second stage pump is divided into 3 parts.

[0062] First, the drive shaft 17 receives rotational power from the outside via a spline connection, driving the internal gear 100 of the bidirectional meshing gear to rotate. In the first-stage pump, the internal gear 100 then drives the external gear 200 meshing with it to rotate. The rotation of gear 200 drives the external gear 200 on the driven shaft to rotate, which in turn drives the internal gear 100 on the driven shaft to rotate. During rotation, some lubricating oil enters the cavity formed by the internal meshing profile of the internal gear 100 and the meshing external gear 200 of one gear assembly in the bidirectional meshing gear, another part of the lubricating oil enters the cavity formed by the internal meshing profile of the internal gear 100 and the meshing external gear 200 of another gear assembly in the bidirectional meshing gear, and the last part of the lubricating oil enters the inter-tooth cavity formed at the external meshing position between the two gear assemblies in the bidirectional meshing gear. With the sealing effect of the front support oil distribution plate 5 and the interstage oil distribution plate 8, the first stage pump completes the process of switching from "oil suction chamber to oil discharge chamber" to ensure that the outlet does not leak oil to the inlet, thus completing a complete "oil suction-oil discharge" process.

[0063] The second-stage pump operates in the same manner as the first-stage pump. With the sealing effect of the interstage distributor plate 8 and the rear support distributor plate 10, the second-stage pump completes the transition from the suction chamber to the discharge chamber, ensuring no oil leakage from the outlet to the inlet, thus completing a full suction-discharge process. The two-stage pumps function as both two internal meshing pumps and one external meshing pump, significantly enhancing the working capacity of the lubricating oil pump. The two pumps work together to apply an axial clamping torque to the lubricating oil pump, ensuring the end face clearance of the pump rotor and thus guaranteeing the pump's performance efficiency.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lubricating oil pump, characterized in that: It includes an oil pump housing (2), which is provided with an oil distribution plate, a drive shaft (17), a driven shaft (3), and several bidirectional meshing gears. The bidirectional meshing gear includes two identical gear assemblies (6) that mesh with each other; the gear assembly (6) includes an internal gear (100), the center of which is provided with a shaft mounting hole (101), and the outer peripheral surface of the internal gear (100) is provided with internal meshing teeth (102); an external gear (200) is provided outside the internal gear (100), the inner peripheral surface of the external gear (200) is machined with an internal meshing profile (210) that meshes with the internal meshing teeth (102), and the outer peripheral surface of the external gear (200) is machined with external meshing teeth (220). The drive shaft (17) is mounted on the drive shaft mounting hole of the oil distributor, and the driven shaft (3) is mounted on the driven shaft mounting hole of the oil distributor. The drive shaft (17) is provided with one gear assembly (6) of the bidirectional meshing gear, and the driven shaft (3) is provided with another gear assembly (6) of the bidirectional meshing gear, and the two gear assemblies (6) are located on the same side of the oil distributor and mesh with each other; The oil distribution plate includes a front support oil distribution plate (5), an interstage oil distribution plate (8), and a rear support oil distribution plate (10) along the direction from the oil inlet to the oil outlet. The interstage oil distribution plate (8) is provided with a mirror-symmetrical and connected drive shaft mounting hole (802) and driven shaft mounting hole (803). The interstage oil distribution plate (8) is also provided with an isolation and sealing structure for oil inlet and oil outlet. The isolation sealing structure includes a first sealing structure located outside the drive shaft mounting hole (802), a second sealing structure located outside the driven shaft mounting hole (803) and mirror-symmetrical to the first sealing structure, and a third sealing structure (805) located between the drive shaft mounting hole (802) and the driven shaft mounting hole (803). Both the first sealing structure and the second sealing structure include an external meshing sealing structure (801) and an internal meshing sealing structure (804). The outer side of the external meshing sealing structure (801) contacts the inner wall of the oil pump housing (2), and the inner side of the external meshing sealing structure (801) is in clearance fit with the tooth surface of the external gear of the gear assembly (6). The internal meshing sealing structure (804) is in clearance fit with the tooth surface between the internal meshing tooth (102) and the internal meshing profile (210). The third sealing structure (805) has a tooth surface clearance fit with the two external gears (200) of the bidirectional meshing gear.

2. The lubricating oil pump according to claim 1, characterized in that: There is at least one interstage oil distribution plate (8), and the bidirectional meshing gear is provided between adjacent interstage oil distribution plates (8), between the interstage oil distribution plate (8) and the front support oil distribution plate (5), and between the interstage oil distribution plate (8) and the rear support oil distribution plate (10).

3. The lubricating oil pump according to claim 1, characterized in that: The drive shaft (17) is provided with a retaining ring (1).

4. The lubricating oil pump according to claim 1, characterized in that: The internal gear (100) is machined with a weight-reducing groove (300).

5. The lubricating oil pump according to claim 1, characterized in that: The internal meshing profile (210) is a cycloidal profile, and the eccentricity of the external gear (200) relative to the internal gear (100) is 1~6mm.

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